X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0979c96223f89cc3b12b9bfab37092579a2b4073..40973ea5fd3b23a02d14f1cc902e6cf01735e9ab:/src/common/datetime.cpp?ds=sidebyside diff --git a/src/common/datetime.cpp b/src/common/datetime.cpp index 6161193d34..8cd374b31f 100644 --- a/src/common/datetime.cpp +++ b/src/common/datetime.cpp @@ -1,13 +1,48 @@ -///////////////////////////////////////////////////////////////////////////// +/////////////////////////////////////////////////////////////////////////////// // Name: wx/datetime.h // Purpose: implementation of time/date related classes // Author: Vadim Zeitlin // Modified by: // Created: 11.05.99 // RCS-ID: $Id$ -// Copyright: (c) 1998 Vadim Zeitlin +// Copyright: (c) 1999 Vadim Zeitlin +// parts of code taken from sndcal library by Scott E. Lee: +// +// Copyright 1993-1995, Scott E. Lee, all rights reserved. +// Permission granted to use, copy, modify, distribute and sell +// so long as the above copyright and this permission statement +// are retained in all copies. +// // Licence: wxWindows license -///////////////////////////////////////////////////////////////////////////// +/////////////////////////////////////////////////////////////////////////////// + +/* + * Implementation notes: + * + * 1. the time is stored as a 64bit integer containing the signed number of + * milliseconds since Jan 1. 1970 (the Unix Epoch) - so it is always + * expressed in GMT. + * + * 2. the range is thus something about 580 million years, but due to current + * algorithms limitations, only dates from Nov 24, 4714BC are handled + * + * 3. standard ANSI C functions are used to do time calculations whenever + * possible, i.e. when the date is in the range Jan 1, 1970 to 2038 + * + * 4. otherwise, the calculations are done by converting the date to/from JDN + * first (the range limitation mentioned above comes from here: the + * algorithm used by Scott E. Lee's code only works for positive JDNs, more + * or less) + * + * 5. the object constructed for the given DD-MM-YYYY HH:MM:SS corresponds to + * this moment in local time and may be converted to the object + * corresponding to the same date/time in another time zone by using + * ToTimezone() + * + * 6. the conversions to the current (or any other) timezone are done when the + * internal time representation is converted to the broken-down one in + * wxDateTime::Tm. + */ // ============================================================================ // declarations @@ -34,8 +69,297 @@ #include "wx/log.h" #endif // WX_PRECOMP +#include "wx/thread.h" +#include "wx/tokenzr.h" + +#define wxDEFINE_TIME_CONSTANTS // before including datetime.h + #include "wx/datetime.h" +// ---------------------------------------------------------------------------- +// conditional compilation +// ---------------------------------------------------------------------------- + +#if defined(HAVE_STRPTIME) && defined(__LINUX__) + // glibc 2.0.7 strptime() is broken - the following snippet causes it to + // crash (instead of just failing): + // + // strncpy(buf, "Tue Dec 21 20:25:40 1999", 128); + // strptime(buf, "%x", &tm); + // + // so don't use it + #undef HAVE_STRPTIME +#endif // broken strptime() + +#ifndef WX_TIMEZONE + #if defined(__BORLANDC__) || defined(__MINGW32__) || defined(__VISAGECPP__) + #define WX_TIMEZONE _timezone + #else // unknown platform - try timezone + #define WX_TIMEZONE timezone + #endif +#endif // !WX_TIMEZONE + +// ---------------------------------------------------------------------------- +// constants +// ---------------------------------------------------------------------------- + +// some trivial ones +static const int MONTHS_IN_YEAR = 12; + +static const int SECONDS_IN_MINUTE = 60; + +static const long SECONDS_PER_DAY = 86400l; + +static const long MILLISECONDS_PER_DAY = 86400000l; + +// this is the integral part of JDN of the midnight of Jan 1, 1970 +// (i.e. JDN(Jan 1, 1970) = 2440587.5) +static const long EPOCH_JDN = 2440587l; + +// the date of JDN -0.5 (as we don't work with fractional parts, this is the +// reference date for us) is Nov 24, 4714BC +static const int JDN_0_YEAR = -4713; +static const int JDN_0_MONTH = wxDateTime::Nov; +static const int JDN_0_DAY = 24; + +// the constants used for JDN calculations +static const long JDN_OFFSET = 32046l; +static const long DAYS_PER_5_MONTHS = 153l; +static const long DAYS_PER_4_YEARS = 1461l; +static const long DAYS_PER_400_YEARS = 146097l; + +// this array contains the cumulated number of days in all previous months for +// normal and leap years +static const wxDateTime::wxDateTime_t gs_cumulatedDays[2][MONTHS_IN_YEAR] = +{ + { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }, + { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 } +}; + +// ---------------------------------------------------------------------------- +// globals +// ---------------------------------------------------------------------------- + +// a critical section is needed to protect GetTimeZone() static +// variable in MT case +#if wxUSE_THREADS + wxCriticalSection gs_critsectTimezone; +#endif // wxUSE_THREADS + +// ---------------------------------------------------------------------------- +// private functions +// ---------------------------------------------------------------------------- + +// get the number of days in the given month of the given year +static inline +wxDateTime::wxDateTime_t GetNumOfDaysInMonth(int year, wxDateTime::Month month) +{ + // the number of days in month in Julian/Gregorian calendar: the first line + // is for normal years, the second one is for the leap ones + static wxDateTime::wxDateTime_t daysInMonth[2][MONTHS_IN_YEAR] = + { + { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, + { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } + }; + + return daysInMonth[wxDateTime::IsLeapYear(year)][month]; +} + +// ensure that the timezone variable is set by calling localtime +static int GetTimeZone() +{ + // set to TRUE when the timezone is set + static bool s_timezoneSet = FALSE; + + wxCRIT_SECT_LOCKER(lock, gs_critsectTimezone); + + if ( !s_timezoneSet ) + { + // just call localtime() instead of figuring out whether this system + // supports tzset(), _tzset() or something else + time_t t; + (void)localtime(&t); + + s_timezoneSet = TRUE; + } + + return (int)WX_TIMEZONE; +} + +// return the integral part of the JDN for the midnight of the given date (to +// get the real JDN you need to add 0.5, this is, in fact, JDN of the +// noon of the previous day) +static long GetTruncatedJDN(wxDateTime::wxDateTime_t day, + wxDateTime::Month mon, + int year) +{ + // CREDIT: code below is by Scott E. Lee (but bugs are mine) + + // check the date validity + wxASSERT_MSG( + (year > JDN_0_YEAR) || + ((year == JDN_0_YEAR) && (mon > JDN_0_MONTH)) || + ((year == JDN_0_YEAR) && (mon == JDN_0_MONTH) && (day >= JDN_0_DAY)), + _T("date out of range - can't convert to JDN") + ); + + // make the year positive to avoid problems with negative numbers division + year += 4800; + + // months are counted from March here + int month; + if ( mon >= wxDateTime::Mar ) + { + month = mon - 2; + } + else + { + month = mon + 10; + year--; + } + + // now we can simply add all the contributions together + return ((year / 100) * DAYS_PER_400_YEARS) / 4 + + ((year % 100) * DAYS_PER_4_YEARS) / 4 + + (month * DAYS_PER_5_MONTHS + 2) / 5 + + day + - JDN_OFFSET; +} + +// this function is a wrapper around strftime(3) +static wxString CallStrftime(const wxChar *format, const tm* tm) +{ + wxChar buf[4096]; + if ( !wxStrftime(buf, WXSIZEOF(buf), format, tm) ) + { + // buffer is too small? + wxFAIL_MSG(_T("strftime() failed")); + } + + return wxString(buf); +} + +// if year and/or month have invalid values, replace them with the current ones +static void ReplaceDefaultYearMonthWithCurrent(int *year, + wxDateTime::Month *month) +{ + struct tm *tmNow = NULL; + + if ( *year == wxDateTime::Inv_Year ) + { + tmNow = wxDateTime::GetTmNow(); + + *year = 1900 + tmNow->tm_year; + } + + if ( *month == wxDateTime::Inv_Month ) + { + if ( !tmNow ) + tmNow = wxDateTime::GetTmNow(); + + *month = (wxDateTime::Month)tmNow->tm_mon; + } +} + +// fll the struct tm with default values +static void InitTm(struct tm& tm) +{ + // struct tm may have etxra fields (undocumented and with unportable + // names) which, nevertheless, must be set to 0 + memset(&tm, 0, sizeof(struct tm)); + + tm.tm_mday = 1; // mday 0 is invalid + tm.tm_year = 76; // any valid year + tm.tm_isdst = -1; // auto determine +} + +// parsing helpers +// --------------- + +// return the month if the string is a month name or Inv_Month otherwise +static wxDateTime::Month GetMonthFromName(const wxString& name, int flags) +{ + wxDateTime::Month mon; + for ( mon = wxDateTime::Jan; mon < wxDateTime::Inv_Month; wxNextMonth(mon) ) + { + // case-insensitive comparison either one of or with both abbreviated + // and not versions + if ( flags & wxDateTime::Name_Full ) + { + if ( name.CmpNoCase(wxDateTime:: + GetMonthName(mon, wxDateTime::Name_Full)) == 0 ) + { + break; + } + } + + if ( flags & wxDateTime::Name_Abbr ) + { + if ( name.CmpNoCase(wxDateTime:: + GetMonthName(mon, wxDateTime::Name_Abbr)) == 0 ) + { + break; + } + } + } + + return mon; +} + +// return the weekday if the string is a weekday name or Inv_WeekDay otherwise +static wxDateTime::WeekDay GetWeekDayFromName(const wxString& name, int flags) +{ + wxDateTime::WeekDay wd; + for ( wd = wxDateTime::Sun; wd < wxDateTime::Inv_WeekDay; wxNextWDay(wd) ) + { + // case-insensitive comparison either one of or with both abbreviated + // and not versions + if ( flags & wxDateTime::Name_Full ) + { + if ( name.CmpNoCase(wxDateTime:: + GetWeekDayName(wd, wxDateTime::Name_Full)) == 0 ) + { + break; + } + } + + if ( flags & wxDateTime::Name_Abbr ) + { + if ( name.CmpNoCase(wxDateTime:: + GetWeekDayName(wd, wxDateTime::Name_Abbr)) == 0 ) + { + break; + } + } + } + + return wd; +} + +// scans all digits and returns the resulting number +static bool GetNumericToken(const wxChar*& p, unsigned long *number) +{ + wxString s; + while ( wxIsdigit(*p) ) + { + s += *p++; + } + + return !!s && s.ToULong(number); +} + +// scans all alphabetic characters and returns the resulting string +static wxString GetAlphaToken(const wxChar*& p) +{ + wxString s; + while ( wxIsalpha(*p) ) + { + s += *p++; + } + + return s; +} + // ============================================================================ // implementation of wxDateTime // ============================================================================ @@ -44,103 +368,2931 @@ // static data // ---------------------------------------------------------------------------- -Country wxDateTime::ms_country; +wxDateTime::Country wxDateTime::ms_country = wxDateTime::Country_Unknown; wxDateTime wxDateTime::ms_InvDateTime; // ---------------------------------------------------------------------------- -// constructors and assignment operators +// struct Tm // ---------------------------------------------------------------------------- -wxDateTime& wxDateTime::Set(const struct tm& tm) +wxDateTime::Tm::Tm() +{ + year = (wxDateTime_t)wxDateTime::Inv_Year; + mon = wxDateTime::Inv_Month; + mday = 0; + hour = min = sec = msec = 0; + wday = wxDateTime::Inv_WeekDay; +} + +wxDateTime::Tm::Tm(const struct tm& tm, const TimeZone& tz) + : m_tz(tz) +{ + msec = 0; + sec = tm.tm_sec; + min = tm.tm_min; + hour = tm.tm_hour; + mday = tm.tm_mday; + mon = (wxDateTime::Month)tm.tm_mon; + year = 1900 + tm.tm_year; + wday = tm.tm_wday; + yday = tm.tm_yday; +} + +bool wxDateTime::Tm::IsValid() const +{ + // we allow for the leap seconds, although we don't use them (yet) + return (year != wxDateTime::Inv_Year) && (mon != wxDateTime::Inv_Month) && + (mday <= GetNumOfDaysInMonth(year, mon)) && + (hour < 24) && (min < 60) && (sec < 62) && (msec < 1000); +} + +void wxDateTime::Tm::ComputeWeekDay() { - time_t timet = mktime(tm); - if ( timet == (time_t)(-1) ) + // compute the week day from day/month/year: we use the dumbest algorithm + // possible: just compute our JDN and then use the (simple to derive) + // formula: weekday = (JDN + 1.5) % 7 + wday = (wxDateTime::WeekDay)(GetTruncatedJDN(mday, mon, year) + 2) % 7; +} + +void wxDateTime::Tm::AddMonths(int monDiff) +{ + // normalize the months field + while ( monDiff < -mon ) { - wxFAIL_MSG(_T("Invalid time")); + year--; - return ms_InvDateTime; + monDiff += MONTHS_IN_YEAR; } - else + + while ( monDiff + mon > MONTHS_IN_YEAR ) { - return Set(timet); + year++; + + monDiff -= MONTHS_IN_YEAR; } + + mon = (wxDateTime::Month)(mon + monDiff); + + wxASSERT_MSG( mon >= 0 && mon < MONTHS_IN_YEAR, _T("logic error") ); } -wxDateTime& wxDateTime::Set(wxDateTime_t hour, - wxDateTime_t minute, - wxDateTime_t second, - wxDateTime_t millisec) +void wxDateTime::Tm::AddDays(int dayDiff) { - // we allow seconds to be 61 to account for the leap seconds, even if we - // don't use them really - wxCHECK_MSG( hour < 24 && second < 62 && minute < 60 && millisec < 1000, - ms_InvDateTime, - _T("Invalid time in wxDateTime::Set()") ); + // normalize the days field + mday += dayDiff; + while ( mday < 1 ) + { + AddMonths(-1); - // get the current date from system - time_t timet = GetTimeNow(); - struct tm *tm = localtime(&timet); + mday += GetNumOfDaysInMonth(year, mon); + } - // adjust the time - tm->tm_hour = hour; - tm->tm_min = minute; - tm->tm_sec = second; + while ( mday > GetNumOfDaysInMonth(year, mon) ) + { + mday -= GetNumOfDaysInMonth(year, mon); - (void)Set(tm); + AddMonths(1); + } - // and finally adjust milliseconds - return SetMillisecond(millisec); + wxASSERT_MSG( mday > 0 && mday <= GetNumOfDaysInMonth(year, mon), + _T("logic error") ); } -wxDateTime& wxDateTime::Set(wxDateTime_t day, - Month month, - int year, - wxDateTime_t hour, - wxDateTime_t minute, - wxDateTime_t second, - wxDateTime_t millisec) +// ---------------------------------------------------------------------------- +// class TimeZone +// ---------------------------------------------------------------------------- + +wxDateTime::TimeZone::TimeZone(wxDateTime::TZ tz) { - wxCHECK_MSG( hour < 24 && second < 62 && minute < 60 && millisec < 1000, - ms_InvDateTime, - _T("Invalid time in wxDateTime::Set()") ); + switch ( tz ) + { + case wxDateTime::Local: + // get the offset from C RTL: it returns the difference GMT-local + // while we want to have the offset _from_ GMT, hence the '-' + m_offset = -GetTimeZone(); + break; + + case wxDateTime::GMT_12: + case wxDateTime::GMT_11: + case wxDateTime::GMT_10: + case wxDateTime::GMT_9: + case wxDateTime::GMT_8: + case wxDateTime::GMT_7: + case wxDateTime::GMT_6: + case wxDateTime::GMT_5: + case wxDateTime::GMT_4: + case wxDateTime::GMT_3: + case wxDateTime::GMT_2: + case wxDateTime::GMT_1: + m_offset = -3600*(wxDateTime::GMT0 - tz); + break; + + case wxDateTime::GMT0: + case wxDateTime::GMT1: + case wxDateTime::GMT2: + case wxDateTime::GMT3: + case wxDateTime::GMT4: + case wxDateTime::GMT5: + case wxDateTime::GMT6: + case wxDateTime::GMT7: + case wxDateTime::GMT8: + case wxDateTime::GMT9: + case wxDateTime::GMT10: + case wxDateTime::GMT11: + case wxDateTime::GMT12: + m_offset = 3600*(tz - wxDateTime::GMT0); + break; + case wxDateTime::A_CST: + // Central Standard Time in use in Australia = UTC + 9.5 + m_offset = 60l*(9*60 + 30); + break; + + default: + wxFAIL_MSG( _T("unknown time zone") ); + } +} + +// ---------------------------------------------------------------------------- +// static functions +// ---------------------------------------------------------------------------- + +/* static */ +bool wxDateTime::IsLeapYear(int year, wxDateTime::Calendar cal) +{ if ( year == Inv_Year ) year = GetCurrentYear(); - if ( month == Inv_Month ) - month = GetCurrentMonth(); - wxCHECK_MSG( day < GetNumberOfDays(month, year), ms_InvDateTime, - _T("Invalid date in wxDateTime::Set()") ); + if ( cal == Gregorian ) + { + // in Gregorian calendar leap years are those divisible by 4 except + // those divisible by 100 unless they're also divisible by 400 + // (in some countries, like Russia and Greece, additional corrections + // exist, but they won't manifest themselves until 2700) + return (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)); + } + else if ( cal == Julian ) + { + // in Julian calendar the rule is simpler + return year % 4 == 0; + } + else + { + wxFAIL_MSG(_T("unknown calendar")); - // the range of time_t type (inclusive) - static const int yearMinInRange = 1970; - static const int yearMaxInRange = 2037; + return FALSE; + } +} - // test only the year instead of testing for the exact end of the Unix - // time_t range - it doesn't bring anything to do more precise checks - if ( year >= yearMaxInRange && year <= yearMaxInRange ) +/* static */ +int wxDateTime::GetCentury(int year) +{ + return year > 0 ? year / 100 : year / 100 - 1; +} + +/* static */ +int wxDateTime::ConvertYearToBC(int year) +{ + // year 0 is BC 1 + return year > 0 ? year : year - 1; +} + +/* static */ +int wxDateTime::GetCurrentYear(wxDateTime::Calendar cal) +{ + switch ( cal ) { - // use the standard library version if the date is in range - this is - // probably much more efficient than our code - struct tm tm; - tm.tm_year = year; - tm.tm_mon = month; - tm.tm_mday = day; - tm.tm_hour = hour; - tm.tm_min = minute; - tm.tm_sec = second; + case Gregorian: + return Now().GetYear(); - (void)Set(tm); + case Julian: + wxFAIL_MSG(_T("TODO")); + break; - // and finally adjust milliseconds - return SetMillisecond(millisec); + default: + wxFAIL_MSG(_T("unsupported calendar")); + break; + } + + return Inv_Year; +} + +/* static */ +wxDateTime::Month wxDateTime::GetCurrentMonth(wxDateTime::Calendar cal) +{ + switch ( cal ) + { + case Gregorian: + return Now().GetMonth(); + break; + + case Julian: + wxFAIL_MSG(_T("TODO")); + break; + + default: + wxFAIL_MSG(_T("unsupported calendar")); + break; + } + + return Inv_Month; +} + +/* static */ +wxDateTime::wxDateTime_t wxDateTime::GetNumberOfDays(int year, Calendar cal) +{ + if ( year == Inv_Year ) + { + // take the current year if none given + year = GetCurrentYear(); + } + + switch ( cal ) + { + case Gregorian: + case Julian: + return IsLeapYear(year) ? 366 : 365; + break; + + default: + wxFAIL_MSG(_T("unsupported calendar")); + break; + } + + return 0; +} + +/* static */ +wxDateTime::wxDateTime_t wxDateTime::GetNumberOfDays(wxDateTime::Month month, + int year, + wxDateTime::Calendar cal) +{ + wxCHECK_MSG( month < MONTHS_IN_YEAR, 0, _T("invalid month") ); + + if ( cal == Gregorian || cal == Julian ) + { + if ( year == Inv_Year ) + { + // take the current year if none given + year = GetCurrentYear(); + } + + return GetNumOfDaysInMonth(year, month); } else { - // do time calculations ourselves: we want to calculate the number of - // milliseconds between the given date and the epoch (necessarily - // negative) + wxFAIL_MSG(_T("unsupported calendar")); + + return 0; } +} - return *this; +/* static */ +wxString wxDateTime::GetMonthName(wxDateTime::Month month, + wxDateTime::NameFlags flags) +{ + wxCHECK_MSG( month != Inv_Month, _T(""), _T("invalid month") ); + + // notice that we must set all the fields to avoid confusing libc (GNU one + // gets confused to a crash if we don't do this) + tm tm; + InitTm(tm); + tm.tm_mon = month; + + return CallStrftime(flags == Name_Abbr ? _T("%b") : _T("%B"), &tm); +} + +/* static */ +wxString wxDateTime::GetWeekDayName(wxDateTime::WeekDay wday, + wxDateTime::NameFlags flags) +{ + wxCHECK_MSG( wday != Inv_WeekDay, _T(""), _T("invalid weekday") ); + + // take some arbitrary Sunday + tm tm; + InitTm(tm); + tm.tm_mday = 28; + tm.tm_mon = Nov; + tm.tm_year = 99; + + // and offset it by the number of days needed to get the correct wday + tm.tm_mday += wday; + + // call mktime() to normalize it... + (void)mktime(&tm); + + // ... and call strftime() + return CallStrftime(flags == Name_Abbr ? _T("%a") : _T("%A"), &tm); +} + +/* static */ +void wxDateTime::GetAmPmStrings(wxString *am, wxString *pm) +{ + tm tm; + InitTm(tm); + if ( am ) + { + *am = CallStrftime(_T("%p"), &tm); + } + if ( pm ) + { + tm.tm_hour = 13; + *pm = CallStrftime(_T("%p"), &tm); + } +} + +// ---------------------------------------------------------------------------- +// Country stuff: date calculations depend on the country (DST, work days, +// ...), so we need to know which rules to follow. +// ---------------------------------------------------------------------------- + +/* static */ +wxDateTime::Country wxDateTime::GetCountry() +{ + // TODO use LOCALE_ICOUNTRY setting under Win32 + + if ( ms_country == Country_Unknown ) + { + // try to guess from the time zone name + time_t t = time(NULL); + struct tm *tm = localtime(&t); + + wxString tz = CallStrftime(_T("%Z"), tm); + if ( tz == _T("WET") || tz == _T("WEST") ) + { + ms_country = UK; + } + else if ( tz == _T("CET") || tz == _T("CEST") ) + { + ms_country = Country_EEC; + } + else if ( tz == _T("MSK") || tz == _T("MSD") ) + { + ms_country = Russia; + } + else if ( tz == _T("AST") || tz == _T("ADT") || + tz == _T("EST") || tz == _T("EDT") || + tz == _T("CST") || tz == _T("CDT") || + tz == _T("MST") || tz == _T("MDT") || + tz == _T("PST") || tz == _T("PDT") ) + { + ms_country = USA; + } + else + { + // well, choose a default one + ms_country = USA; + } + } + + return ms_country; +} + +/* static */ +void wxDateTime::SetCountry(wxDateTime::Country country) +{ + ms_country = country; +} + +/* static */ +bool wxDateTime::IsWestEuropeanCountry(Country country) +{ + if ( country == Country_Default ) + { + country = GetCountry(); + } + + return (Country_WesternEurope_Start <= country) && + (country <= Country_WesternEurope_End); +} + +// ---------------------------------------------------------------------------- +// DST calculations: we use 3 different rules for the West European countries, +// USA and for the rest of the world. This is undoubtedly false for many +// countries, but I lack the necessary info (and the time to gather it), +// please add the other rules here! +// ---------------------------------------------------------------------------- + +/* static */ +bool wxDateTime::IsDSTApplicable(int year, Country country) +{ + if ( year == Inv_Year ) + { + // take the current year if none given + year = GetCurrentYear(); + } + + if ( country == Country_Default ) + { + country = GetCountry(); + } + + switch ( country ) + { + case USA: + case UK: + // DST was first observed in the US and UK during WWI, reused + // during WWII and used again since 1966 + return year >= 1966 || + (year >= 1942 && year <= 1945) || + (year == 1918 || year == 1919); + + default: + // assume that it started after WWII + return year > 1950; + } +} + +/* static */ +wxDateTime wxDateTime::GetBeginDST(int year, Country country) +{ + if ( year == Inv_Year ) + { + // take the current year if none given + year = GetCurrentYear(); + } + + if ( country == Country_Default ) + { + country = GetCountry(); + } + + if ( !IsDSTApplicable(year, country) ) + { + return ms_InvDateTime; + } + + wxDateTime dt; + + if ( IsWestEuropeanCountry(country) || (country == Russia) ) + { + // DST begins at 1 a.m. GMT on the last Sunday of March + if ( !dt.SetToLastWeekDay(Sun, Mar, year) ) + { + // weird... + wxFAIL_MSG( _T("no last Sunday in March?") ); + } + + dt += wxTimeSpan::Hours(1); + + dt.MakeGMT(); + } + else switch ( country ) + { + case USA: + switch ( year ) + { + case 1918: + case 1919: + // don't know for sure - assume it was in effect all year + + case 1943: + case 1944: + case 1945: + dt.Set(1, Jan, year); + break; + + case 1942: + // DST was installed Feb 2, 1942 by the Congress + dt.Set(2, Feb, year); + break; + + // Oil embargo changed the DST period in the US + case 1974: + dt.Set(6, Jan, 1974); + break; + + case 1975: + dt.Set(23, Feb, 1975); + break; + + default: + // before 1986, DST begun on the last Sunday of April, but + // in 1986 Reagan changed it to begin at 2 a.m. of the + // first Sunday in April + if ( year < 1986 ) + { + if ( !dt.SetToLastWeekDay(Sun, Apr, year) ) + { + // weird... + wxFAIL_MSG( _T("no first Sunday in April?") ); + } + } + else + { + if ( !dt.SetToWeekDay(Sun, 1, Apr, year) ) + { + // weird... + wxFAIL_MSG( _T("no first Sunday in April?") ); + } + } + + dt += wxTimeSpan::Hours(2); + + // TODO what about timezone?? + } + + break; + + default: + // assume Mar 30 as the start of the DST for the rest of the world + // - totally bogus, of course + dt.Set(30, Mar, year); + } + + return dt; +} + +/* static */ +wxDateTime wxDateTime::GetEndDST(int year, Country country) +{ + if ( year == Inv_Year ) + { + // take the current year if none given + year = GetCurrentYear(); + } + + if ( country == Country_Default ) + { + country = GetCountry(); + } + + if ( !IsDSTApplicable(year, country) ) + { + return ms_InvDateTime; + } + + wxDateTime dt; + + if ( IsWestEuropeanCountry(country) || (country == Russia) ) + { + // DST ends at 1 a.m. GMT on the last Sunday of October + if ( !dt.SetToLastWeekDay(Sun, Oct, year) ) + { + // weirder and weirder... + wxFAIL_MSG( _T("no last Sunday in October?") ); + } + + dt += wxTimeSpan::Hours(1); + + dt.MakeGMT(); + } + else switch ( country ) + { + case USA: + switch ( year ) + { + case 1918: + case 1919: + // don't know for sure - assume it was in effect all year + + case 1943: + case 1944: + dt.Set(31, Dec, year); + break; + + case 1945: + // the time was reset after the end of the WWII + dt.Set(30, Sep, year); + break; + + default: + // DST ends at 2 a.m. on the last Sunday of October + if ( !dt.SetToLastWeekDay(Sun, Oct, year) ) + { + // weirder and weirder... + wxFAIL_MSG( _T("no last Sunday in October?") ); + } + + dt += wxTimeSpan::Hours(2); + + // TODO what about timezone?? + } + break; + + default: + // assume October 26th as the end of the DST - totally bogus too + dt.Set(26, Oct, year); + } + + return dt; +} + +// ---------------------------------------------------------------------------- +// constructors and assignment operators +// ---------------------------------------------------------------------------- + +// the values in the tm structure contain the local time +wxDateTime& wxDateTime::Set(const struct tm& tm) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + struct tm tm2(tm); + time_t timet = mktime(&tm2); + + if ( timet == (time_t)-1 ) + { + // mktime() rather unintuitively fails for Jan 1, 1970 if the hour is + // less than timezone - try to make it work for this case + if ( tm2.tm_year == 70 && tm2.tm_mon == 0 && tm2.tm_mday == 1 ) + { + // add timezone to make sure that date is in range + tm2.tm_sec -= GetTimeZone(); + + timet = mktime(&tm2); + if ( timet != (time_t)-1 ) + { + timet += GetTimeZone(); + + return Set(timet); + } + } + + wxFAIL_MSG( _T("mktime() failed") ); + + return ms_InvDateTime; + } + else + { + return Set(timet); + } +} + +wxDateTime& wxDateTime::Set(wxDateTime_t hour, + wxDateTime_t minute, + wxDateTime_t second, + wxDateTime_t millisec) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + // we allow seconds to be 61 to account for the leap seconds, even if we + // don't use them really + wxCHECK_MSG( hour < 24 && second < 62 && minute < 60 && millisec < 1000, + ms_InvDateTime, + _T("Invalid time in wxDateTime::Set()") ); + + // get the current date from system + time_t timet = GetTimeNow(); + struct tm *tm = localtime(&timet); + + wxCHECK_MSG( tm, ms_InvDateTime, _T("localtime() failed") ); + + // adjust the time + tm->tm_hour = hour; + tm->tm_min = minute; + tm->tm_sec = second; + + (void)Set(*tm); + + // and finally adjust milliseconds + return SetMillisecond(millisec); +} + +wxDateTime& wxDateTime::Set(wxDateTime_t day, + Month month, + int year, + wxDateTime_t hour, + wxDateTime_t minute, + wxDateTime_t second, + wxDateTime_t millisec) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + wxCHECK_MSG( hour < 24 && second < 62 && minute < 60 && millisec < 1000, + ms_InvDateTime, + _T("Invalid time in wxDateTime::Set()") ); + + ReplaceDefaultYearMonthWithCurrent(&year, &month); + + wxCHECK_MSG( (0 < day) && (day <= GetNumberOfDays(month, year)), + ms_InvDateTime, + _T("Invalid date in wxDateTime::Set()") ); + + // the range of time_t type (inclusive) + static const int yearMinInRange = 1970; + static const int yearMaxInRange = 2037; + + // test only the year instead of testing for the exact end of the Unix + // time_t range - it doesn't bring anything to do more precise checks + if ( year >= yearMinInRange && year <= yearMaxInRange ) + { + // use the standard library version if the date is in range - this is + // probably more efficient than our code + struct tm tm; + tm.tm_year = year - 1900; + tm.tm_mon = month; + tm.tm_mday = day; + tm.tm_hour = hour; + tm.tm_min = minute; + tm.tm_sec = second; + tm.tm_isdst = -1; // mktime() will guess it + + (void)Set(tm); + + // and finally adjust milliseconds + return SetMillisecond(millisec); + } + else + { + // do time calculations ourselves: we want to calculate the number of + // milliseconds between the given date and the epoch + + // get the JDN for the midnight of this day + m_time = GetTruncatedJDN(day, month, year); + m_time -= EPOCH_JDN; + m_time *= SECONDS_PER_DAY * TIME_T_FACTOR; + + // JDN corresponds to GMT, we take localtime + Add(wxTimeSpan(hour, minute, second + GetTimeZone(), millisec)); + } + + return *this; +} + +wxDateTime& wxDateTime::Set(double jdn) +{ + // so that m_time will be 0 for the midnight of Jan 1, 1970 which is jdn + // EPOCH_JDN + 0.5 + jdn -= EPOCH_JDN + 0.5; + + jdn *= MILLISECONDS_PER_DAY; + + m_time = jdn; + + return *this; +} + +// ---------------------------------------------------------------------------- +// time_t <-> broken down time conversions +// ---------------------------------------------------------------------------- + +wxDateTime::Tm wxDateTime::GetTm(const TimeZone& tz) const +{ +#ifdef __VMS__ + int time2; +#endif + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + time_t time = GetTicks(); + if ( time != (time_t)-1 ) + { + // use C RTL functions + tm *tm; + if ( tz.GetOffset() == -GetTimeZone() ) + { + // we are working with local time + tm = localtime(&time); + + // should never happen + wxCHECK_MSG( tm, Tm(), _T("gmtime() failed") ); + } + else + { + time += tz.GetOffset(); +#ifdef __VMS__ /* time is unsigned so VMS gives a warning on the original */ + time2 = (int) time; + if ( time2 >= 0 ) +#else + if ( time >= 0 ) +#endif + { + tm = gmtime(&time); + + // should never happen + wxCHECK_MSG( tm, Tm(), _T("gmtime() failed") ); + } + else + { + tm = (struct tm *)NULL; + } + } + + if ( tm ) + { + return Tm(*tm, tz); + } + //else: use generic code below + } + + // remember the time and do the calculations with the date only - this + // eliminates rounding errors of the floating point arithmetics + + wxLongLong timeMidnight = m_time + tz.GetOffset() * 1000; + + long timeOnly = (timeMidnight % MILLISECONDS_PER_DAY).ToLong(); + + // we want to always have positive time and timeMidnight to be really + // the midnight before it + if ( timeOnly < 0 ) + { + timeOnly = MILLISECONDS_PER_DAY + timeOnly; + } + + timeMidnight -= timeOnly; + + // calculate the Gregorian date from JDN for the midnight of our date: + // this will yield day, month (in 1..12 range) and year + + // actually, this is the JDN for the noon of the previous day + long jdn = (timeMidnight / MILLISECONDS_PER_DAY).ToLong() + EPOCH_JDN; + + // CREDIT: code below is by Scott E. Lee (but bugs are mine) + + wxASSERT_MSG( jdn > -2, _T("JDN out of range") ); + + // calculate the century + int temp = (jdn + JDN_OFFSET) * 4 - 1; + int century = temp / DAYS_PER_400_YEARS; + + // then the year and day of year (1 <= dayOfYear <= 366) + temp = ((temp % DAYS_PER_400_YEARS) / 4) * 4 + 3; + int year = (century * 100) + (temp / DAYS_PER_4_YEARS); + int dayOfYear = (temp % DAYS_PER_4_YEARS) / 4 + 1; + + // and finally the month and day of the month + temp = dayOfYear * 5 - 3; + int month = temp / DAYS_PER_5_MONTHS; + int day = (temp % DAYS_PER_5_MONTHS) / 5 + 1; + + // month is counted from March - convert to normal + if ( month < 10 ) + { + month += 3; + } + else + { + year += 1; + month -= 9; + } + + // year is offset by 4800 + year -= 4800; + + // check that the algorithm gave us something reasonable + wxASSERT_MSG( (0 < month) && (month <= 12), _T("invalid month") ); + wxASSERT_MSG( (1 <= day) && (day < 32), _T("invalid day") ); + wxASSERT_MSG( (INT_MIN <= year) && (year <= INT_MAX), + _T("year range overflow") ); + + // construct Tm from these values + Tm tm; + tm.year = (int)year; + tm.mon = (Month)(month - 1); // algorithm yields 1 for January, not 0 + tm.mday = (wxDateTime_t)day; + tm.msec = timeOnly % 1000; + timeOnly -= tm.msec; + timeOnly /= 1000; // now we have time in seconds + + tm.sec = timeOnly % 60; + timeOnly -= tm.sec; + timeOnly /= 60; // now we have time in minutes + + tm.min = timeOnly % 60; + timeOnly -= tm.min; + + tm.hour = timeOnly / 60; + + return tm; +} + +wxDateTime& wxDateTime::SetYear(int year) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + Tm tm(GetTm()); + tm.year = year; + Set(tm); + + return *this; +} + +wxDateTime& wxDateTime::SetMonth(Month month) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + Tm tm(GetTm()); + tm.mon = month; + Set(tm); + + return *this; +} + +wxDateTime& wxDateTime::SetDay(wxDateTime_t mday) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + Tm tm(GetTm()); + tm.mday = mday; + Set(tm); + + return *this; +} + +wxDateTime& wxDateTime::SetHour(wxDateTime_t hour) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + Tm tm(GetTm()); + tm.hour = hour; + Set(tm); + + return *this; +} + +wxDateTime& wxDateTime::SetMinute(wxDateTime_t min) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + Tm tm(GetTm()); + tm.min = min; + Set(tm); + + return *this; +} + +wxDateTime& wxDateTime::SetSecond(wxDateTime_t sec) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + Tm tm(GetTm()); + tm.sec = sec; + Set(tm); + + return *this; +} + +wxDateTime& wxDateTime::SetMillisecond(wxDateTime_t millisecond) +{ + wxASSERT_MSG( IsValid(), _T("invalid wxDateTime") ); + + // we don't need to use GetTm() for this one + m_time -= m_time % 1000l; + m_time += millisecond; + + return *this; +} + +// ---------------------------------------------------------------------------- +// wxDateTime arithmetics +// ---------------------------------------------------------------------------- + +wxDateTime& wxDateTime::Add(const wxDateSpan& diff) +{ + Tm tm(GetTm()); + + tm.year += diff.GetYears(); + tm.AddMonths(diff.GetMonths()); + tm.AddDays(diff.GetTotalDays()); + + Set(tm); + + return *this; +} + +// ---------------------------------------------------------------------------- +// Weekday and monthday stuff +// ---------------------------------------------------------------------------- + +wxDateTime& wxDateTime::SetToLastMonthDay(Month month, + int year) +{ + // take the current month/year if none specified + ReplaceDefaultYearMonthWithCurrent(&year, &month); + + return Set(GetNumOfDaysInMonth(year, month), month, year); +} + +wxDateTime& wxDateTime::SetToWeekDayInSameWeek(WeekDay weekday) +{ + wxCHECK_MSG( weekday != Inv_WeekDay, ms_InvDateTime, _T("invalid weekday") ); + + WeekDay wdayThis = GetWeekDay(); + if ( weekday == wdayThis ) + { + // nothing to do + return *this; + } + else if ( weekday < wdayThis ) + { + return Substract(wxTimeSpan::Days(wdayThis - weekday)); + } + else // weekday > wdayThis + { + return Add(wxTimeSpan::Days(weekday - wdayThis)); + } +} + +wxDateTime& wxDateTime::SetToNextWeekDay(WeekDay weekday) +{ + wxCHECK_MSG( weekday != Inv_WeekDay, ms_InvDateTime, _T("invalid weekday") ); + + int diff; + WeekDay wdayThis = GetWeekDay(); + if ( weekday == wdayThis ) + { + // nothing to do + return *this; + } + else if ( weekday < wdayThis ) + { + // need to advance a week + diff = 7 - (wdayThis - weekday); + } + else // weekday > wdayThis + { + diff = weekday - wdayThis; + } + + return Add(wxTimeSpan::Days(diff)); +} + +wxDateTime& wxDateTime::SetToPrevWeekDay(WeekDay weekday) +{ + wxCHECK_MSG( weekday != Inv_WeekDay, ms_InvDateTime, _T("invalid weekday") ); + + int diff; + WeekDay wdayThis = GetWeekDay(); + if ( weekday == wdayThis ) + { + // nothing to do + return *this; + } + else if ( weekday > wdayThis ) + { + // need to go to previous week + diff = 7 - (weekday - wdayThis); + } + else // weekday < wdayThis + { + diff = wdayThis - weekday; + } + + return Substract(wxTimeSpan::Days(diff)); +} + +bool wxDateTime::SetToWeekDay(WeekDay weekday, + int n, + Month month, + int year) +{ + wxCHECK_MSG( weekday != Inv_WeekDay, FALSE, _T("invalid weekday") ); + + // we don't check explicitly that -5 <= n <= 5 because we will return FALSE + // anyhow in such case - but may be should still give an assert for it? + + // take the current month/year if none specified + ReplaceDefaultYearMonthWithCurrent(&year, &month); + + wxDateTime dt; + + // TODO this probably could be optimised somehow... + + if ( n > 0 ) + { + // get the first day of the month + dt.Set(1, month, year); + + // get its wday + WeekDay wdayFirst = dt.GetWeekDay(); + + // go to the first weekday of the month + int diff = weekday - wdayFirst; + if ( diff < 0 ) + diff += 7; + + // add advance n-1 weeks more + diff += 7*(n - 1); + + dt += wxDateSpan::Days(diff); + } + else // count from the end of the month + { + // get the last day of the month + dt.SetToLastMonthDay(month, year); + + // get its wday + WeekDay wdayLast = dt.GetWeekDay(); + + // go to the last weekday of the month + int diff = wdayLast - weekday; + if ( diff < 0 ) + diff += 7; + + // and rewind n-1 weeks from there + diff += 7*(-n - 1); + + dt -= wxDateSpan::Days(diff); + } + + // check that it is still in the same month + if ( dt.GetMonth() == month ) + { + *this = dt; + + return TRUE; + } + else + { + // no such day in this month + return FALSE; + } +} + +wxDateTime::wxDateTime_t wxDateTime::GetDayOfYear(const TimeZone& tz) const +{ + Tm tm(GetTm(tz)); + + return gs_cumulatedDays[IsLeapYear(tm.year)][tm.mon] + tm.mday; +} + +wxDateTime::wxDateTime_t wxDateTime::GetWeekOfYear(const TimeZone& tz) const +{ +#if 0 + // the first week of the year is the one which contains Jan, 4 (according + // to ISO standard rule), so the year day N0 = 4 + 7*W always lies in the + // week W+1. As any day N = 7*W + 4 + (N - 4)%7, it lies in the same week + // as N0 or in the next one. + + // TODO this surely may be optimized - I got confused while writing it + + wxDateTime_t nDayInYear = GetDayOfYear(tz); + + // the week day of the day lying in the first week + WeekDay wdayStart = wxDateTime(4, Jan, GetYear()).GetWeekDay(); + + wxDateTime_t week = (nDayInYear - 4) / 7 + 1; + + // notice that Sunday shoould be counted as 7, not 0 here! + if ( ((nDayInYear - 4) % 7) + (!wdayStart ? 7 : wdayStart) > 7 ) + { + week++; + } + + return week; +#else // this seems to be a bit simpler and I believe is also correct + return (WeekDay)((GetDayOfYear() - (GetWeekDay() - 1 + 7) % 7 + 7) / 7); +#endif // 0/1 +} + +wxDateTime::wxDateTime_t wxDateTime::GetWeekOfMonth(const TimeZone& tz) const +{ + size_t nWeek = 0; + + wxDateTime dt(*this); + do + { + nWeek++; + + dt -= wxTimeSpan::Week(); + } + while ( dt.GetMonth(tz) == GetMonth(tz) ); + + return nWeek; +} + +wxDateTime& wxDateTime::SetToYearDay(wxDateTime::wxDateTime_t yday) +{ + int year = GetYear(); + wxCHECK_MSG( (0 < yday) && (yday <= GetNumberOfDays(year)), + ms_InvDateTime, _T("invalid year day") ); + + bool isLeap = IsLeapYear(year); + for ( Month mon = Jan; mon < Inv_Month; wxNextMonth(mon) ) + { + // for Dec, we can't compare with gs_cumulatedDays[mon + 1], but we + // don't need it neither - because of the CHECK above we know that + // yday lies in December then + if ( (mon == Dec) || (yday < gs_cumulatedDays[isLeap][mon + 1]) ) + { + Set(yday - gs_cumulatedDays[isLeap][mon], mon, year); + + break; + } + } + + return *this; +} + +// ---------------------------------------------------------------------------- +// Julian day number conversion and related stuff +// ---------------------------------------------------------------------------- + +double wxDateTime::GetJulianDayNumber() const +{ + // JDN are always expressed for the GMT dates + Tm tm(ToTimezone(GMT0).GetTm(GMT0)); + + double result = GetTruncatedJDN(tm.mday, tm.mon, tm.year); + + // add the part GetTruncatedJDN() neglected + result += 0.5; + + // and now add the time: 86400 sec = 1 JDN + return result + ((double)(60*(60*tm.hour + tm.min) + tm.sec)) / 86400; +} + +double wxDateTime::GetRataDie() const +{ + // March 1 of the year 0 is Rata Die day -306 and JDN 1721119.5 + return GetJulianDayNumber() - 1721119.5 - 306; +} + +// ---------------------------------------------------------------------------- +// timezone and DST stuff +// ---------------------------------------------------------------------------- + +int wxDateTime::IsDST(wxDateTime::Country country) const +{ + wxCHECK_MSG( country == Country_Default, -1, + _T("country support not implemented") ); + + // use the C RTL for the dates in the standard range + time_t timet = GetTicks(); + if ( timet != (time_t)-1 ) + { + tm *tm = localtime(&timet); + + wxCHECK_MSG( tm, -1, _T("localtime() failed") ); + + return tm->tm_isdst; + } + else + { + int year = GetYear(); + + if ( !IsDSTApplicable(year, country) ) + { + // no DST time in this year in this country + return -1; + } + + return IsBetween(GetBeginDST(year, country), GetEndDST(year, country)); + } +} + +wxDateTime& wxDateTime::MakeTimezone(const TimeZone& tz) +{ + int secDiff = GetTimeZone() + tz.GetOffset(); + + // we need to know whether DST is or not in effect for this date + if ( IsDST() == 1 ) + { + // FIXME we assume that the DST is always shifted by 1 hour + secDiff -= 3600; + } + + return Substract(wxTimeSpan::Seconds(secDiff)); +} + +// ---------------------------------------------------------------------------- +// wxDateTime to/from text representations +// ---------------------------------------------------------------------------- + +wxString wxDateTime::Format(const wxChar *format, const TimeZone& tz) const +{ +#ifdef __VMS__ + int time2; +#endif + wxCHECK_MSG( format, _T(""), _T("NULL format in wxDateTime::Format") ); + + time_t time = GetTicks(); + if ( time != (time_t)-1 ) + { + // use strftime() + tm *tm; + if ( tz.GetOffset() == -GetTimeZone() ) + { + // we are working with local time + tm = localtime(&time); + + // should never happen + wxCHECK_MSG( tm, wxEmptyString, _T("localtime() failed") ); + } + else + { + time += tz.GetOffset(); + +#ifdef __VMS__ /* time is unsigned so VMS gives a warning on the original */ + time2 = (int) time; + if ( time2 >= 0 ) +#else + if ( time >= 0 ) +#endif + { + tm = gmtime(&time); + + // should never happen + wxCHECK_MSG( tm, wxEmptyString, _T("gmtime() failed") ); + } + else + { + tm = (struct tm *)NULL; + } + } + + if ( tm ) + { + return CallStrftime(format, tm); + } + //else: use generic code below + } + + // we only parse ANSI C format specifications here, no POSIX 2 + // complications, no GNU extensions + Tm tm = GetTm(tz); + + // used for calls to strftime() when we only deal with time + struct tm tmTimeOnly; + tmTimeOnly.tm_hour = tm.hour; + tmTimeOnly.tm_min = tm.min; + tmTimeOnly.tm_sec = tm.sec; + tmTimeOnly.tm_wday = 0; + tmTimeOnly.tm_yday = 0; + tmTimeOnly.tm_mday = 1; // any date will do + tmTimeOnly.tm_mon = 0; + tmTimeOnly.tm_year = 76; + tmTimeOnly.tm_isdst = 0; // no DST, we adjust for tz ourselves + + wxString tmp, res, fmt; + for ( const wxChar *p = format; *p; p++ ) + { + if ( *p != _T('%') ) + { + // copy as is + res += *p; + + continue; + } + + // set the default format + switch ( *++p ) + { + case _T('Y'): // year has 4 digits + fmt = _T("%04d"); + break; + + case _T('j'): // day of year has 3 digits + fmt = _T("%03d"); + break; + + default: + // it's either another valid format specifier in which case + // the format is "%02d" (for all the rest) or we have the + // field width preceding the format in which case it will + // override the default format anyhow + fmt = _T("%02d"); + } + +restart: + // start of the format specification + switch ( *p ) + { + case _T('a'): // a weekday name + case _T('A'): + // second parameter should be TRUE for abbreviated names + res += GetWeekDayName(tm.GetWeekDay(), + *p == _T('a') ? Name_Abbr : Name_Full); + break; + + case _T('b'): // a month name + case _T('B'): + res += GetMonthName(tm.mon, + *p == _T('b') ? Name_Abbr : Name_Full); + break; + + case _T('c'): // locale default date and time representation + case _T('x'): // locale default date representation + // + // the problem: there is no way to know what do these format + // specifications correspond to for the current locale. + // + // the solution: use a hack and still use strftime(): first + // find the YEAR which is a year in the strftime() range (1970 + // - 2038) whose Jan 1 falls on the same week day as the Jan 1 + // of the real year. Then make a copy of the format and + // replace all occurences of YEAR in it with some unique + // string not appearing anywhere else in it, then use + // strftime() to format the date in year YEAR and then replace + // YEAR back by the real year and the unique replacement + // string back with YEAR. Notice that "all occurences of YEAR" + // means all occurences of 4 digit as well as 2 digit form! + // + // the bugs: we assume that neither of %c nor %x contains any + // fields which may change between the YEAR and real year. For + // example, the week number (%U, %W) and the day number (%j) + // will change if one of these years is leap and the other one + // is not! + { + // find the YEAR: normally, for any year X, Jan 1 or the + // year X + 28 is the same weekday as Jan 1 of X (because + // the weekday advances by 1 for each normal X and by 2 + // for each leap X, hence by 5 every 4 years or by 35 + // which is 0 mod 7 every 28 years) but this rule breaks + // down if there are years between X and Y which are + // divisible by 4 but not leap (i.e. divisible by 100 but + // not 400), hence the correction. + + int yearReal = GetYear(tz); + int mod28 = yearReal % 28; + + // be careful to not go too far - we risk to leave the + // supported range + int year; + if ( mod28 < 10 ) + { + year = 1988 + mod28; // 1988 == 0 (mod 28) + } + else + { + year = 1970 + mod28 - 10; // 1970 == 10 (mod 28) + } + + int nCentury = year / 100, + nCenturyReal = yearReal / 100; + + // need to adjust for the years divisble by 400 which are + // not leap but are counted like leap ones if we just take + // the number of centuries in between for nLostWeekDays + int nLostWeekDays = (nCentury - nCenturyReal) - + (nCentury / 4 - nCenturyReal / 4); + + // we have to gain back the "lost" weekdays: note that the + // effect of this loop is to not do anything to + // nLostWeekDays (which we won't use any more), but to + // (indirectly) set the year correctly + while ( (nLostWeekDays % 7) != 0 ) + { + nLostWeekDays += year++ % 4 ? 1 : 2; + } + + // at any rate, we couldn't go further than 1988 + 9 + 28! + wxASSERT_MSG( year < 2030, + _T("logic error in wxDateTime::Format") ); + + wxString strYear, strYear2; + strYear.Printf(_T("%d"), year); + strYear2.Printf(_T("%d"), year % 100); + + // find two strings not occuring in format (this is surely + // not optimal way of doing it... improvements welcome!) + wxString fmt = format; + wxString replacement = (wxChar)-1; + while ( fmt.Find(replacement) != wxNOT_FOUND ) + { + replacement << (wxChar)-1; + } + + wxString replacement2 = (wxChar)-2; + while ( fmt.Find(replacement) != wxNOT_FOUND ) + { + replacement << (wxChar)-2; + } + + // replace all occurences of year with it + bool wasReplaced = fmt.Replace(strYear, replacement) > 0; + if ( !wasReplaced ) + wasReplaced = fmt.Replace(strYear2, replacement2) > 0; + + // use strftime() to format the same date but in supported + // year + // + // NB: we assume that strftime() doesn't check for the + // date validity and will happily format the date + // corresponding to Feb 29 of a non leap year (which + // may happen if yearReal was leap and year is not) + struct tm tmAdjusted; + InitTm(tmAdjusted); + tmAdjusted.tm_hour = tm.hour; + tmAdjusted.tm_min = tm.min; + tmAdjusted.tm_sec = tm.sec; + tmAdjusted.tm_wday = tm.GetWeekDay(); + tmAdjusted.tm_yday = GetDayOfYear(); + tmAdjusted.tm_mday = tm.mday; + tmAdjusted.tm_mon = tm.mon; + tmAdjusted.tm_year = year - 1900; + tmAdjusted.tm_isdst = 0; // no DST, already adjusted + wxString str = CallStrftime(*p == _T('c') ? _T("%c") + : _T("%x"), + &tmAdjusted); + + // now replace the occurence of 1999 with the real year + wxString strYearReal, strYearReal2; + strYearReal.Printf(_T("%04d"), yearReal); + strYearReal2.Printf(_T("%02d"), yearReal % 100); + str.Replace(strYear, strYearReal); + str.Replace(strYear2, strYearReal2); + + // and replace back all occurences of replacement string + if ( wasReplaced ) + { + str.Replace(replacement2, strYear2); + str.Replace(replacement, strYear); + } + + res += str; + } + break; + + case _T('d'): // day of a month (01-31) + res += wxString::Format(fmt, tm.mday); + break; + + case _T('H'): // hour in 24h format (00-23) + res += wxString::Format(fmt, tm.hour); + break; + + case _T('I'): // hour in 12h format (01-12) + { + // 24h -> 12h, 0h -> 12h too + int hour12 = tm.hour > 12 ? tm.hour - 12 + : tm.hour ? tm.hour : 12; + res += wxString::Format(fmt, hour12); + } + break; + + case _T('j'): // day of the year + res += wxString::Format(fmt, GetDayOfYear(tz)); + break; + + case _T('m'): // month as a number (01-12) + res += wxString::Format(fmt, tm.mon + 1); + break; + + case _T('M'): // minute as a decimal number (00-59) + res += wxString::Format(fmt, tm.min); + break; + + case _T('p'): // AM or PM string + res += CallStrftime(_T("%p"), &tmTimeOnly); + break; + + case _T('S'): // second as a decimal number (00-61) + res += wxString::Format(fmt, tm.sec); + break; + + case _T('U'): // week number in the year (Sunday 1st week day) + { + int week = (GetDayOfYear(tz) - tm.GetWeekDay() + 7) / 7; + res += wxString::Format(fmt, week); + } + break; + + case _T('W'): // week number in the year (Monday 1st week day) + res += wxString::Format(fmt, GetWeekOfYear(tz)); + break; + + case _T('w'): // weekday as a number (0-6), Sunday = 0 + res += wxString::Format(fmt, tm.GetWeekDay()); + break; + + // case _T('x'): -- handled with "%c" + + case _T('X'): // locale default time representation + // just use strftime() to format the time for us + res += CallStrftime(_T("%X"), &tmTimeOnly); + break; + + case _T('y'): // year without century (00-99) + res += wxString::Format(fmt, tm.year % 100); + break; + + case _T('Y'): // year with century + res += wxString::Format(fmt, tm.year); + break; + + case _T('Z'): // timezone name + res += CallStrftime(_T("%Z"), &tmTimeOnly); + break; + + default: + // is it the format width? + fmt.Empty(); + while ( *p == _T('-') || *p == _T('+') || + *p == _T(' ') || wxIsdigit(*p) ) + { + fmt += *p; + } + + if ( !fmt.IsEmpty() ) + { + // we've only got the flags and width so far in fmt + fmt.Prepend(_T('%')); + fmt.Append(_T('d')); + + goto restart; + } + + // no, it wasn't the width + wxFAIL_MSG(_T("unknown format specificator")); + + // fall through and just copy it nevertheless + + case _T('%'): // a percent sign + res += *p; + break; + + case 0: // the end of string + wxFAIL_MSG(_T("missing format at the end of string")); + + // just put the '%' which was the last char in format + res += _T('%'); + break; + } + } + + return res; +} + +// this function parses a string in (strict) RFC 822 format: see the section 5 +// of the RFC for the detailed description, but briefly it's something of the +// form "Sat, 18 Dec 1999 00:48:30 +0100" +// +// this function is "strict" by design - it must reject anything except true +// RFC822 time specs. +// +// TODO a great candidate for using reg exps +const wxChar *wxDateTime::ParseRfc822Date(const wxChar* date) +{ + wxCHECK_MSG( date, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") ); + + const wxChar *p = date; + const wxChar *comma = wxStrchr(p, _T(',')); + if ( comma ) + { + // the part before comma is the weekday + + // skip it for now - we don't use but might check that it really + // corresponds to the specfied date + p = comma + 1; + + if ( *p != _T(' ') ) + { + wxLogDebug(_T("no space after weekday in RFC822 time spec")); + + return (wxChar *)NULL; + } + + p++; // skip space + } + + // the following 1 or 2 digits are the day number + if ( !wxIsdigit(*p) ) + { + wxLogDebug(_T("day number expected in RFC822 time spec, none found")); + + return (wxChar *)NULL; + } + + wxDateTime_t day = *p++ - _T('0'); + if ( wxIsdigit(*p) ) + { + day *= 10; + day += *p++ - _T('0'); + } + + if ( *p++ != _T(' ') ) + { + return (wxChar *)NULL; + } + + // the following 3 letters specify the month + wxString monName(p, 3); + Month mon; + if ( monName == _T("Jan") ) + mon = Jan; + else if ( monName == _T("Feb") ) + mon = Feb; + else if ( monName == _T("Mar") ) + mon = Mar; + else if ( monName == _T("Apr") ) + mon = Apr; + else if ( monName == _T("May") ) + mon = May; + else if ( monName == _T("Jun") ) + mon = Jun; + else if ( monName == _T("Jul") ) + mon = Jul; + else if ( monName == _T("Aug") ) + mon = Aug; + else if ( monName == _T("Sep") ) + mon = Sep; + else if ( monName == _T("Oct") ) + mon = Oct; + else if ( monName == _T("Nov") ) + mon = Nov; + else if ( monName == _T("Dec") ) + mon = Dec; + else + { + wxLogDebug(_T("Invalid RFC 822 month name '%s'"), monName.c_str()); + + return (wxChar *)NULL; + } + + p += 3; + + if ( *p++ != _T(' ') ) + { + return (wxChar *)NULL; + } + + // next is the year + if ( !wxIsdigit(*p) ) + { + // no year? + return (wxChar *)NULL; + } + + int year = *p++ - _T('0'); + + if ( !wxIsdigit(*p) ) + { + // should have at least 2 digits in the year + return (wxChar *)NULL; + } + + year *= 10; + year += *p++ - _T('0'); + + // is it a 2 digit year (as per original RFC 822) or a 4 digit one? + if ( wxIsdigit(*p) ) + { + year *= 10; + year += *p++ - _T('0'); + + if ( !wxIsdigit(*p) ) + { + // no 3 digit years please + return (wxChar *)NULL; + } + + year *= 10; + year += *p++ - _T('0'); + } + + if ( *p++ != _T(' ') ) + { + return (wxChar *)NULL; + } + + // time is in the format hh:mm:ss and seconds are optional + if ( !wxIsdigit(*p) ) + { + return (wxChar *)NULL; + } + + wxDateTime_t hour = *p++ - _T('0'); + + if ( !wxIsdigit(*p) ) + { + return (wxChar *)NULL; + } + + hour *= 10; + hour += *p++ - _T('0'); + + if ( *p++ != _T(':') ) + { + return (wxChar *)NULL; + } + + if ( !wxIsdigit(*p) ) + { + return (wxChar *)NULL; + } + + wxDateTime_t min = *p++ - _T('0'); + + if ( !wxIsdigit(*p) ) + { + return (wxChar *)NULL; + } + + min *= 10; + min += *p++ - _T('0'); + + wxDateTime_t sec = 0; + if ( *p++ == _T(':') ) + { + if ( !wxIsdigit(*p) ) + { + return (wxChar *)NULL; + } + + sec = *p++ - _T('0'); + + if ( !wxIsdigit(*p) ) + { + return (wxChar *)NULL; + } + + sec *= 10; + sec += *p++ - _T('0'); + } + + if ( *p++ != _T(' ') ) + { + return (wxChar *)NULL; + } + + // and now the interesting part: the timezone + int offset; + if ( *p == _T('-') || *p == _T('+') ) + { + // the explicit offset given: it has the form of hhmm + bool plus = *p++ == _T('+'); + + if ( !wxIsdigit(*p) || !wxIsdigit(*(p + 1)) ) + { + return (wxChar *)NULL; + } + + // hours + offset = 60*(10*(*p - _T('0')) + (*(p + 1) - _T('0'))); + + p += 2; + + if ( !wxIsdigit(*p) || !wxIsdigit(*(p + 1)) ) + { + return (wxChar *)NULL; + } + + // minutes + offset += 10*(*p - _T('0')) + (*(p + 1) - _T('0')); + + if ( !plus ) + { + offset = -offset; + } + + p += 2; + } + else + { + // the symbolic timezone given: may be either military timezone or one + // of standard abbreviations + if ( !*(p + 1) ) + { + // military: Z = UTC, J unused, A = -1, ..., Y = +12 + static const int offsets[26] = + { + //A B C D E F G H I J K L M + -1, -2, -3, -4, -5, -6, -7, -8, -9, 0, -10, -11, -12, + //N O P R Q S T U V W Z Y Z + +1, +2, +3, +4, +5, +6, +7, +8, +9, +10, +11, +12, 0 + }; + + if ( *p < _T('A') || *p > _T('Z') || *p == _T('J') ) + { + wxLogDebug(_T("Invalid militaty timezone '%c'"), *p); + + return (wxChar *)NULL; + } + + offset = offsets[*p++ - _T('A')]; + } + else + { + // abbreviation + wxString tz = p; + if ( tz == _T("UT") || tz == _T("UTC") || tz == _T("GMT") ) + offset = 0; + else if ( tz == _T("AST") ) + offset = AST - GMT0; + else if ( tz == _T("ADT") ) + offset = ADT - GMT0; + else if ( tz == _T("EST") ) + offset = EST - GMT0; + else if ( tz == _T("EDT") ) + offset = EDT - GMT0; + else if ( tz == _T("CST") ) + offset = CST - GMT0; + else if ( tz == _T("CDT") ) + offset = CDT - GMT0; + else if ( tz == _T("MST") ) + offset = MST - GMT0; + else if ( tz == _T("MDT") ) + offset = MDT - GMT0; + else if ( tz == _T("PST") ) + offset = PST - GMT0; + else if ( tz == _T("PDT") ) + offset = PDT - GMT0; + else + { + wxLogDebug(_T("Unknown RFC 822 timezone '%s'"), p); + + return (wxChar *)NULL; + } + + p += tz.length(); + } + + // make it minutes + offset *= 60; + } + + // the spec was correct + Set(day, mon, year, hour, min, sec); + MakeTimezone(60*(wxDateTime_t)offset); + + return p; +} + +const wxChar *wxDateTime::ParseFormat(const wxChar *date, + const wxChar *format, + const wxDateTime& dateDef) +{ + wxCHECK_MSG( date && format, (wxChar *)NULL, + _T("NULL pointer in wxDateTime::ParseFormat()") ); + + wxString str; + unsigned long num; + + // what fields have we found? + bool haveWDay = FALSE, + haveYDay = FALSE, + haveDay = FALSE, + haveMon = FALSE, + haveYear = FALSE, + haveHour = FALSE, + haveMin = FALSE, + haveSec = FALSE; + + bool hourIsIn12hFormat = FALSE, // or in 24h one? + isPM = FALSE; // AM by default + + // and the value of the items we have (init them to get rid of warnings) + wxDateTime_t sec = 0, + min = 0, + hour = 0; + WeekDay wday = Inv_WeekDay; + wxDateTime_t yday = 0, + mday = 0; + wxDateTime::Month mon = Inv_Month; + int year = 0; + + const wxChar *input = date; + for ( const wxChar *fmt = format; *fmt; fmt++ ) + { + if ( *fmt != _T('%') ) + { + if ( wxIsspace(*fmt) ) + { + // a white space in the format string matches 0 or more white + // spaces in the input + while ( wxIsspace(*input) ) + { + input++; + } + } + else // !space + { + // any other character (not whitespace, not '%') must be + // matched by itself in the input + if ( *input++ != *fmt ) + { + // no match + return (wxChar *)NULL; + } + } + + // done with this format char + continue; + } + + // start of a format specification + switch ( *++fmt ) + { + case _T('a'): // a weekday name + case _T('A'): + { + int flag = *fmt == _T('a') ? Name_Abbr : Name_Full; + wday = GetWeekDayFromName(GetAlphaToken(input), flag); + if ( wday == Inv_WeekDay ) + { + // no match + return (wxChar *)NULL; + } + } + haveWDay = TRUE; + break; + + case _T('b'): // a month name + case _T('B'): + { + int flag = *fmt == _T('b') ? Name_Abbr : Name_Full; + mon = GetMonthFromName(GetAlphaToken(input), flag); + if ( mon == Inv_Month ) + { + // no match + return (wxChar *)NULL; + } + } + haveMon = TRUE; + break; + + case _T('c'): // locale default date and time representation + { + wxDateTime dt; + + // this is the format which corresponds to ctime() output + // and strptime("%c") should parse it, so try it first + static const wxChar *fmtCtime = _T("%a %b %e %H:%M:%S %Y"); + + const wxChar *result = dt.ParseFormat(input, fmtCtime); + if ( !result ) + { + result = dt.ParseFormat(input, _T("%x %X")); + } + + if ( !result ) + { + result = dt.ParseFormat(input, _T("%X %x")); + } + + if ( !result ) + { + // we've tried everything and still no match + return (wxChar *)NULL; + } + + Tm tm = dt.GetTm(); + + haveDay = haveMon = haveYear = + haveHour = haveMin = haveSec = TRUE; + + hour = tm.hour; + min = tm.min; + sec = tm.sec; + + year = tm.year; + mon = tm.mon; + mday = tm.mday; + + input = result; + } + break; + + case _T('d'): // day of a month (01-31) + if ( !GetNumericToken(input, &num) || (num > 31) ) + { + // no match + return (wxChar *)NULL; + } + + // we can't check whether the day range is correct yet, will + // do it later - assume ok for now + haveDay = TRUE; + mday = (wxDateTime_t)num; + break; + + case _T('H'): // hour in 24h format (00-23) + if ( !GetNumericToken(input, &num) || (num > 23) ) + { + // no match + return (wxChar *)NULL; + } + + haveHour = TRUE; + hour = (wxDateTime_t)num; + break; + + case _T('I'): // hour in 12h format (01-12) + if ( !GetNumericToken(input, &num) || !num || (num > 12) ) + { + // no match + return (wxChar *)NULL; + } + + haveHour = TRUE; + hourIsIn12hFormat = TRUE; + hour = num % 12; // 12 should be 0 + break; + + case _T('j'): // day of the year + if ( !GetNumericToken(input, &num) || !num || (num > 366) ) + { + // no match + return (wxChar *)NULL; + } + + haveYDay = TRUE; + yday = (wxDateTime_t)num; + break; + + case _T('m'): // month as a number (01-12) + if ( !GetNumericToken(input, &num) || !num || (num > 12) ) + { + // no match + return (wxChar *)NULL; + } + + haveMon = TRUE; + mon = (Month)(num - 1); + break; + + case _T('M'): // minute as a decimal number (00-59) + if ( !GetNumericToken(input, &num) || (num > 59) ) + { + // no match + return (wxChar *)NULL; + } + + haveMin = TRUE; + min = (wxDateTime_t)num; + break; + + case _T('p'): // AM or PM string + { + wxString am, pm, token = GetAlphaToken(input); + + GetAmPmStrings(&am, &pm); + if ( token.CmpNoCase(pm) == 0 ) + { + isPM = TRUE; + } + else if ( token.CmpNoCase(am) != 0 ) + { + // no match + return (wxChar *)NULL; + } + } + break; + + case _T('r'): // time as %I:%M:%S %p + { + wxDateTime dt; + input = dt.ParseFormat(input, _T("%I:%M:%S %p")); + if ( !input ) + { + // no match + return (wxChar *)NULL; + } + + haveHour = haveMin = haveSec = TRUE; + + Tm tm = dt.GetTm(); + hour = tm.hour; + min = tm.min; + sec = tm.sec; + } + break; + + case _T('R'): // time as %H:%M + { + wxDateTime dt; + input = dt.ParseFormat(input, _T("%H:%M")); + if ( !input ) + { + // no match + return (wxChar *)NULL; + } + + haveHour = haveMin = TRUE; + + Tm tm = dt.GetTm(); + hour = tm.hour; + min = tm.min; + } + + case _T('S'): // second as a decimal number (00-61) + if ( !GetNumericToken(input, &num) || (num > 61) ) + { + // no match + return (wxChar *)NULL; + } + + haveSec = TRUE; + sec = (wxDateTime_t)num; + break; + + case _T('T'): // time as %H:%M:%S + { + wxDateTime dt; + input = dt.ParseFormat(input, _T("%H:%M:%S")); + if ( !input ) + { + // no match + return (wxChar *)NULL; + } + + haveHour = haveMin = haveSec = TRUE; + + Tm tm = dt.GetTm(); + hour = tm.hour; + min = tm.min; + sec = tm.sec; + } + break; + + case _T('w'): // weekday as a number (0-6), Sunday = 0 + if ( !GetNumericToken(input, &num) || (wday > 6) ) + { + // no match + return (wxChar *)NULL; + } + + haveWDay = TRUE; + wday = (WeekDay)num; + break; + + case _T('x'): // locale default date representation +#ifdef HAVE_STRPTIME + // try using strptime() - it may fail even if the input is + // correct but the date is out of range, so we will fall back + // to our generic code anyhow (FIXME !Unicode friendly) + { + struct tm tm; + const wxChar *result = strptime(input, "%x", &tm); + if ( result ) + { + input = result; + + haveDay = haveMon = haveYear = TRUE; + + year = 1900 + tm.tm_year; + mon = (Month)tm.tm_mon; + mday = tm.tm_mday; + + break; + } + } +#endif // HAVE_STRPTIME + + // TODO query the LOCALE_IDATE setting under Win32 + { + wxDateTime dt; + + wxString fmtDate; + if ( IsWestEuropeanCountry(GetCountry()) || + GetCountry() == Russia ) + { + fmtDate = _T("%d/%m/%y"); + } + else // assume USA + { + fmtDate = _T("%m/%d/%y"); + } + + const wxChar *result = dt.ParseFormat(input, fmtDate); + if ( !result ) + { + // bad luck + return (wxChar *)NULL; + } + + Tm tm = dt.GetTm(); + + haveDay = haveMon = haveYear = TRUE; + + year = tm.year; + mon = tm.mon; + mday = tm.mday; + + input = result; + } + + break; + + case _T('X'): // locale default time representation +#ifdef HAVE_STRPTIME + { + // use strptime() to do it for us (FIXME !Unicode friendly) + struct tm tm; + input = strptime(input, "%X", &tm); + if ( !input ) + { + return (wxChar *)NULL; + } + + haveHour = haveMin = haveSec = TRUE; + + hour = tm.tm_hour; + min = tm.tm_min; + sec = tm.tm_sec; + } +#else // !HAVE_STRPTIME + // TODO under Win32 we can query the LOCALE_ITIME system + // setting which says whether the default time format is + // 24 or 12 hour + { + // try to parse what follows as "%H:%M:%S" and, if this + // fails, as "%I:%M:%S %p" - this should catch the most + // common cases + wxDateTime dt; + + const wxChar *result = dt.ParseFormat(input, _T("%T")); + if ( !result ) + { + result = dt.ParseFormat(input, _T("%r")); + } + + if ( !result ) + { + // no match + return (wxChar *)NULL; + } + + haveHour = haveMin = haveSec = TRUE; + + Tm tm = dt.GetTm(); + hour = tm.hour; + min = tm.min; + sec = tm.sec; + + input = result; + } +#endif // HAVE_STRPTIME/!HAVE_STRPTIME + break; + + case _T('y'): // year without century (00-99) + if ( !GetNumericToken(input, &num) || (num > 99) ) + { + // no match + return (wxChar *)NULL; + } + + haveYear = TRUE; + year = 1900 + num; + break; + + case _T('Y'): // year with century + if ( !GetNumericToken(input, &num) ) + { + // no match + return (wxChar *)NULL; + } + + haveYear = TRUE; + year = (wxDateTime_t)num; + break; + + case _T('Z'): // timezone name + wxFAIL_MSG(_T("TODO")); + break; + + case _T('%'): // a percent sign + if ( *input++ != _T('%') ) + { + // no match + return (wxChar *)NULL; + } + break; + + case 0: // the end of string + wxFAIL_MSG(_T("unexpected format end")); + + // fall through + + default: // not a known format spec + return (wxChar *)NULL; + } + } + + // format matched, try to construct a date from what we have now + Tm tmDef; + if ( dateDef.IsValid() ) + { + // take this date as default + tmDef = dateDef.GetTm(); + } + else if ( m_time != 0 ) + { + // if this date is valid, don't change it + tmDef = GetTm(); + } + else + { + // no default and this date is invalid - fall back to Today() + tmDef = Today().GetTm(); + } + + Tm tm = tmDef; + + // set the date + if ( haveYear ) + { + tm.year = year; + } + + // TODO we don't check here that the values are consistent, if both year + // day and month/day were found, we just ignore the year day and we + // also always ignore the week day + if ( haveMon && haveDay ) + { + if ( mday > GetNumOfDaysInMonth(tm.year, mon) ) + { + wxLogDebug(_T("bad month day in wxDateTime::ParseFormat")); + + return (wxChar *)NULL; + } + + tm.mon = mon; + tm.mday = mday; + } + else if ( haveYDay ) + { + if ( yday > GetNumberOfDays(tm.year) ) + { + wxLogDebug(_T("bad year day in wxDateTime::ParseFormat")); + + return (wxChar *)NULL; + } + + Tm tm2 = wxDateTime(1, Jan, tm.year).SetToYearDay(yday).GetTm(); + + tm.mon = tm2.mon; + tm.mday = tm2.mday; + } + + // deal with AM/PM + if ( haveHour && hourIsIn12hFormat && isPM ) + { + // translate to 24hour format + hour += 12; + } + //else: either already in 24h format or no translation needed + + // set the time + if ( haveHour ) + { + tm.hour = hour; + } + + if ( haveMin ) + { + tm.min = min; + } + + if ( haveSec ) + { + tm.sec = sec; + } + + Set(tm); + + return input; +} + +const wxChar *wxDateTime::ParseDateTime(const wxChar *date) +{ + wxCHECK_MSG( date, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") ); + + // there is a public domain version of getdate.y, but it only works for + // English... + wxFAIL_MSG(_T("TODO")); + + return (wxChar *)NULL; +} + +const wxChar *wxDateTime::ParseDate(const wxChar *date) +{ + // this is a simplified version of ParseDateTime() which understands only + // "today" (for wxDate compatibility) and digits only otherwise (and not + // all esoteric constructions ParseDateTime() knows about) + + wxCHECK_MSG( date, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") ); + + const wxChar *p = date; + while ( wxIsspace(*p) ) + p++; + + wxString today = _T("today"); + size_t len = today.length(); + if ( wxString(p, len).CmpNoCase(today) == 0 ) + { + // nothing can follow this, so stop here + p += len; + + *this = Today(); + + return p; + } + + // what do we have? + bool haveDay = FALSE, // the months day? + haveWDay = FALSE, // the day of week? + haveMon = FALSE, // the month? + haveYear = FALSE; // the year? + + // and the value of the items we have (init them to get rid of warnings) + WeekDay wday = Inv_WeekDay; + wxDateTime_t day = 0; + wxDateTime::Month mon = Inv_Month; + int year = 0; + + // tokenize the string + wxStringTokenizer tok(p, _T(",/-\t ")); + while ( tok.HasMoreTokens() ) + { + wxString token = tok.GetNextToken(); + + // is it a number? + unsigned long val; + if ( token.ToULong(&val) ) + { + // guess what this number is + + bool isDay = FALSE, + isMonth = FALSE, + // only years are counted from 0 + isYear = (val == 0) || (val > 31); + if ( !isYear ) + { + // may be the month or month day or the year, assume the + // month day by default and fallback to month if the range + // allow it or to the year if our assumption doesn't work + if ( haveDay ) + { + // we already have the day, so may only be a month or year + if ( val > 12 ) + { + isYear = TRUE; + } + else + { + isMonth = TRUE; + } + } + else // it may be day + { + isDay = TRUE; + + // check the range + if ( haveMon ) + { + if ( val > GetNumOfDaysInMonth(haveYear ? year + : Inv_Year, + mon) ) + { + // oops, it can't be a day finally + isDay = FALSE; + + if ( val > 12 ) + { + isYear = TRUE; + } + else + { + isMonth = TRUE; + } + } + } + } + } + + // remember that we have this and stop the scan if it's the second + // time we find this, except for the day logic (see there) + if ( isYear ) + { + if ( haveYear ) + { + break; + } + + haveYear = TRUE; + + // no roll over - 99 means 99, not 1999 for us + year = val; + } + else if ( isMonth ) + { + if ( haveMon ) + { + break; + } + + haveMon = TRUE; + + mon = (wxDateTime::Month)val; + } + else + { + wxASSERT_MSG( isDay, _T("logic error") ); + + if ( haveDay ) + { + // may be were mistaken when we found it for the first + // time? may be it was a month or year instead? + // + // this ability to "backtrack" allows us to correctly parse + // both things like 01/13 and 13/01 - but, of course, we + // still can't resolve the ambiguity in 01/02 (it will be + // Feb 1 for us, not Jan 2 as americans might expect!) + if ( (day <= 12) && !haveMon ) + { + // exchange day and month + mon = (wxDateTime::Month)day; + + haveMon = TRUE; + } + else if ( !haveYear ) + { + // exchange day and year + year = day; + + haveYear = TRUE; + } + } + + haveDay = TRUE; + + day = val; + } + } + else // not a number + { + mon = GetMonthFromName(token, Name_Full | Name_Abbr); + if ( mon != Inv_Month ) + { + // it's a month + if ( haveMon ) + { + break; + } + + haveMon = TRUE; + } + else + { + wday = GetWeekDayFromName(token, Name_Full | Name_Abbr); + if ( wday != Inv_WeekDay ) + { + // a week day + if ( haveWDay ) + { + break; + } + + haveWDay = TRUE; + } + else + { + // try the ordinals + static const wxChar *ordinals[] = + { + wxTRANSLATE("first"), + wxTRANSLATE("second"), + wxTRANSLATE("third"), + wxTRANSLATE("fourth"), + wxTRANSLATE("fifth"), + wxTRANSLATE("sixth"), + wxTRANSLATE("seventh"), + wxTRANSLATE("eighth"), + wxTRANSLATE("ninth"), + wxTRANSLATE("tenth"), + wxTRANSLATE("eleventh"), + wxTRANSLATE("twelfth"), + wxTRANSLATE("thirteenth"), + wxTRANSLATE("fourteenth"), + wxTRANSLATE("fifteenth"), + wxTRANSLATE("sixteenth"), + wxTRANSLATE("seventeenth"), + wxTRANSLATE("eighteenth"), + wxTRANSLATE("nineteenth"), + wxTRANSLATE("twentieth"), + // that's enough - otherwise we'd have problems with + // composite (or not) ordinals otherwise + }; + + size_t n; + for ( n = 0; n < WXSIZEOF(ordinals); n++ ) + { + if ( token.CmpNoCase(ordinals[n]) == 0 ) + { + break; + } + } + + if ( n == WXSIZEOF(ordinals) ) + { + // stop here - something unknown + break; + } + + // it's a day + if ( haveDay ) + { + // don't try anything here (as in case of numeric day + // above) - the symbolic day spec should always + // precede the month/year + break; + } + + haveDay = TRUE; + + day = n + 1; + } + } + } + } + + // either no more tokens or the scan was stopped by something we couldn't + // parse - in any case, see if we can construct a date from what we have + if ( !haveDay && !haveWDay ) + { + wxLogDebug(_T("no day, no weekday hence no date.")); + + return (wxChar *)NULL; + } + + if ( haveWDay && (haveMon || haveYear || haveDay) && + !(haveMon && haveMon && haveYear) ) + { + // without adjectives (which we don't support here) the week day only + // makes sense completely separately or with the full date + // specification (what would "Wed 1999" mean?) + return (wxChar *)NULL; + } + + if ( !haveMon ) + { + mon = GetCurrentMonth(); + } + + if ( !haveYear ) + { + year = GetCurrentYear(); + } + + if ( haveDay ) + { + Set(day, mon, year); + + if ( haveWDay ) + { + // check that it is really the same + if ( GetWeekDay() != wday ) + { + // inconsistency detected + return (wxChar *)NULL; + } + } + } + else // haveWDay + { + *this = Today(); + + SetToWeekDayInSameWeek(wday); + } + + // return the pointer to the next char + return p + wxStrlen(p) - wxStrlen(tok.GetString()); +} + +const wxChar *wxDateTime::ParseTime(const wxChar *time) +{ + wxCHECK_MSG( time, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") ); + + // first try some extra things + static const struct + { + const wxChar *name; + wxDateTime_t hour; + } stdTimes[] = + { + { wxTRANSLATE("noon"), 12 }, + { wxTRANSLATE("midnight"), 00 }, + // anything else? + }; + + for ( size_t n = 0; n < WXSIZEOF(stdTimes); n++ ) + { + wxString timeString = wxGetTranslation(stdTimes[n].name); + size_t len = timeString.length(); + if ( timeString.CmpNoCase(wxString(time, len)) == 0 ) + { + Set(stdTimes[n].hour, 0, 0); + + return time + len; + } + } + + // try all time formats we may think about starting with the standard one + const wxChar *result = ParseFormat(time, _T("%X")); + if ( !result ) + { + // normally, it's the same, but why not try it? + result = ParseFormat(time, _T("%H:%M:%S")); + } + + if ( !result ) + { + // 12hour with AM/PM? + result = ParseFormat(time, _T("%I:%M:%S %p")); + } + + if ( !result ) + { + // without seconds? + result = ParseFormat(time, _T("%H:%M")); + } + + if ( !result ) + { + // 12hour with AM/PM but without seconds? + result = ParseFormat(time, _T("%I:%M %p")); + } + + if ( !result ) + { + // just the hour? + result = ParseFormat(time, _T("%H")); + } + + if ( !result ) + { + // just the hour and AM/PM? + result = ParseFormat(time, _T("%I %p")); + } + + // TODO: parse timezones + + return result; +} + +// ============================================================================ +// wxTimeSpan +// ============================================================================ + +// not all strftime(3) format specifiers make sense here because, for example, +// a time span doesn't have a year nor a timezone +// +// Here are the ones which are supported (all of them are supported by strftime +// as well): +// %H hour in 24 hour format +// %M minute (00 - 59) +// %S second (00 - 59) +// %% percent sign +// +// Also, for MFC CTimeSpan compatibility, we support +// %D number of days +// +// And, to be better than MFC :-), we also have +// %E number of wEeks +// %l milliseconds (000 - 999) +wxString wxTimeSpan::Format(const wxChar *format) const +{ + wxCHECK_MSG( format, _T(""), _T("NULL format in wxTimeSpan::Format") ); + + wxString str; + str.Alloc(strlen(format)); + + for ( const wxChar *pch = format; pch; pch++ ) + { + wxChar ch = *pch; + + if ( ch == '%' ) + { + wxString tmp; + + ch = *pch++; + switch ( ch ) + { + default: + wxFAIL_MSG( _T("invalid format character") ); + // fall through + + case '%': + // will get to str << ch below + break; + + case 'D': + tmp.Printf(_T("%d"), GetDays()); + break; + + case 'E': + tmp.Printf(_T("%d"), GetWeeks()); + break; + + case 'H': + tmp.Printf(_T("%02d"), GetHours()); + break; + + case 'l': + tmp.Printf(_T("%03ld"), GetMilliseconds().ToLong()); + break; + + case 'M': + tmp.Printf(_T("%02d"), GetMinutes()); + break; + + case 'S': + tmp.Printf(_T("%02ld"), GetSeconds().ToLong()); + break; + } + + if ( !!tmp ) + { + str += tmp; + + // skip str += ch below + continue; + } + } + + str += ch; + } + + return str; }