src/common/date.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        date.cpp
   3 // Purpose:     wxDate class
   4 // Author:
   5 //    Originally inspired by Steve Marcus (CIS 72007,1233)  6/16/91
   6 //    Enhanced by Eric Simon (CIS 70540,1522)               6/29/91
   7 //    Further Enhanced by Chris Hill (CIS 72030,2606)       7/11/91
   8 //    Still Further Enhanced by Hill & Simon  v3.10         8/05/91
   9 //    Version 4 by Charles D. Price                         6/27/92
  10 //    Integrated into wxWindows by Julian Smart             9th July 1995
  11 // Modified by:
  12 // Created:     01/02/97
  13 // RCS-ID:      $Id$
  14 // Copyright:   (c) Julian Smart and Markus Holzem
  15 // Licence:     wxWindows licence
  16 /////////////////////////////////////////////////////////////////////////////
  17
  18 #ifdef __GNUG__
  19 #pragma implementation "date.h"
  20 #endif
  21
  22 // For compilers that support precompilation, includes "wx.h".
  23 #include "wx/wxprec.h"
  24
  25 #ifdef __BORLANDC__
  26   #pragma hdrstop
  27 #endif
  28
  29 #if wxUSE_TIMEDATE
  30
  31 #include "wx/date.h"
  32 #include "wx/intl.h"
  33
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <stdlib.h>
  37
  38 #include "wx/ioswrap.h"
  39
  40 #include <time.h>
  41 #include <string.h>
  42
  43 #define ABBR_LENGTH 3
  44
  45 static const wxChar *dayname[] = {
  46     wxT("Sunday"), wxT("Monday"), wxT("Tuesday"), wxT("Wednesday"),
  47     wxT("Thursday"), wxT("Friday"), wxT("Saturday")
  48 };
  49
  50 static const wxChar *mname[] = {
  51     wxT("January"), wxT("February"), wxT("March"), wxT("April"), wxT("May"), wxT("June"),
  52     wxT("July"), wxT("August"), wxT("September"), wxT("October"), wxT("November"), wxT("December")
  53 };
  54
  55 static int GauDays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  56
  57 #if !USE_SHARED_LIBRARY
  58 IMPLEMENT_DYNAMIC_CLASS(wxDate, wxObject)
  59 #endif
  60
  61     ////////////////////////////////////////////////////////////
  62     // Constructors
  63     ////////////////////////////////////////////////////////////
  64
  65 wxDate::wxDate()
  66 {
  67     DisplayFormat=wxMDY;
  68     DisplayOptions='\0';
  69     month = day = year = day_of_week = 0;
  70     julian = 0;
  71 }
  72
  73 wxDate::wxDate (long j) : julian(j)
  74 {
  75     DisplayFormat=wxMDY;
  76     DisplayOptions='\0';
  77     julian_to_mdy ();
  78 }
  79
  80 wxDate::wxDate (int m, int d, int y) : month(m), day(d), year(y)
  81 {
  82     DisplayFormat=wxMDY;
  83     DisplayOptions='\0';
  84     mdy_to_julian ();
  85 }
  86
  87 wxDate::wxDate (const wxString& dat)
  88 {
  89     DisplayFormat=wxMDY;
  90     DisplayOptions='\0';
  91     if (wxStrcmp(dat, wxT("TODAY")) == 0 || wxStrcmp(dat, wxT("today")) == 0)
  92     {
  93         // Sets the current date
  94         Set();
  95     }
  96     else
  97     {
  98         wxChar buf[100];
  99         wxStrcpy(buf, dat);
 100
 101         wxChar *save_ptr, *token = wxStrtok(buf,wxT("/-"),&save_ptr);
 102         month = wxAtoi(token);
 103         day   = wxAtoi(wxStrtok((wxChar *) NULL,wxT("/-"),&save_ptr));
 104         year  = wxAtoi(wxStrtok((wxChar *) NULL,wxT(" "),&save_ptr));
 105     }
 106
 107     mdy_to_julian ();
 108 }
 109
 110 wxDate::wxDate (const wxDate &dt)
 111 {
 112     DisplayFormat=dt.DisplayFormat;
 113     DisplayOptions=dt.DisplayOptions;
 114     month = dt.month;
 115     day   = dt.day;
 116     year  = dt.year;
 117     mdy_to_julian ();
 118 }
 119
 120 void wxDate::operator = (const wxDate &dt)
 121 {
 122     DisplayFormat=dt.DisplayFormat;
 123     DisplayOptions=dt.DisplayOptions;
 124     month = dt.month;
 125     day   = dt.day;
 126     year  = dt.year;
 127     mdy_to_julian (); // wxUSE_TIMEDATE
 128 }
 129
 130 void wxDate::operator = (const wxString& dat)
 131 {
 132     DisplayFormat=wxMDY;
 133     DisplayOptions='\0';
 134     if (wxStrcmp(dat, wxT("TODAY")) == 0 || wxStrcmp(dat, wxT("today")) == 0)
 135     {
 136         // Sets the current date
 137         Set();
 138     }
 139     else
 140     {
 141         wxChar buf[100];
 142         wxStrcpy(buf, dat);
 143
 144         wxChar *save_ptr, *token = wxStrtok(buf,wxT("/-"),&save_ptr);
 145         month = wxAtoi(token);
 146         day   = wxAtoi(wxStrtok((wxChar *) NULL,wxT("/-"),&save_ptr));
 147         year  = wxAtoi(wxStrtok((wxChar *) NULL,wxT(" "),&save_ptr));
 148     }
 149
 150     mdy_to_julian ();
 151 }
 152
 153 //////////////////////////////////////////////////////////////
 154 // Conversion operations
 155 //////////////////////////////////////////////////////////////
 156
 157 #ifndef __SALFORDC__
 158 wxDate::operator wxString( void )
 159 {
 160     return FormatDate();
 161 }
 162 #endif
 163
 164 //////////////////////////////////////////////////////////////
 165 // Date Arithmetic
 166 //////////////////////////////////////////////////////////////
 167
 168 wxDate wxDate::operator + (long i)
 169 {
 170     wxDate dp(julian + i);
 171     return dp;
 172 }
 173
 174 wxDate wxDate::operator + (int i)
 175 {
 176     wxDate dp(julian + (long)i);
 177     return dp;
 178 }
 179
 180 wxDate wxDate::operator - (long i)
 181 {
 182     wxDate dp(julian - i);
 183     return dp;
 184 }
 185
 186 wxDate wxDate::operator - (int i)
 187 {
 188     wxDate dp(julian - (long)i);
 189     return dp;
 190 }
 191
 192 long wxDate::operator - (const wxDate &dt)
 193 {
 194     return ( julian - dt.julian );
 195 }
 196
 197 wxDate &wxDate::operator += (long i)
 198 {
 199     julian += i;
 200     julian_to_mdy();
 201     return *this;
 202 }
 203
 204 wxDate &wxDate::operator -= (long i)
 205 {
 206     julian -= i;
 207     julian_to_mdy();
 208     return *this;
 209 }
 210
 211 wxDate &wxDate::operator ++()
 212 {
 213     julian++;
 214     julian_to_mdy();
 215     return *this;
 216 }
 217
 218 wxDate &wxDate::operator ++(int)
 219 {
 220     julian++;
 221     julian_to_mdy();
 222     return *this;
 223 }
 224
 225 wxDate &wxDate::operator --()
 226 {
 227     julian--;
 228     julian_to_mdy();
 229     return *this;
 230 }
 231
 232 wxDate &wxDate::operator --(int)
 233 {
 234     julian--;
 235     julian_to_mdy();
 236     return *this;
 237 }
 238
 239 //////////////////////////////////////////////////////////////
 240 // Date comparison
 241 //////////////////////////////////////////////////////////////
 242
 243 bool WXDLLEXPORT operator <  (const wxDate &dt1, const wxDate &dt2)
 244 {
 245     return ( dt1.julian < dt2.julian );
 246 }
 247
 248 bool WXDLLEXPORT operator <= (const wxDate &dt1, const wxDate &dt2)
 249 {
 250     return ( (dt1.julian == dt2.julian) || (dt1.julian < dt2.julian) );
 251 }
 252
 253 bool WXDLLEXPORT operator >  (const wxDate &dt1, const wxDate &dt2)
 254 {
 255     return ( dt1.julian > dt2.julian );
 256 }
 257
 258 bool WXDLLEXPORT operator >= (const wxDate &dt1, const wxDate &dt2)
 259 {
 260     return ( (dt1.julian == dt2.julian) || (dt1.julian > dt2.julian) );
 261 }
 262
 263 bool WXDLLEXPORT operator == (const wxDate &dt1, const wxDate &dt2)
 264 {
 265     return ( dt1.julian == dt2.julian );
 266 }
 267
 268 bool WXDLLEXPORT operator != (const wxDate &dt1, const wxDate &dt2)
 269 {
 270     return ( dt1.julian != dt2.julian );
 271 }
 272
 273
 274 #if wxUSE_STD_IOSTREAM
 275
 276 ////////////////////////////////////////////////////////////////
 277 // Ostream operations
 278 ////////////////////////////////////////////////////////////////
 279
 280 ostream WXDLLEXPORT & operator << (ostream &os, const wxDate &dt)
 281 {
 282     return os << dt.FormatDate().mb_str();
 283 }
 284
 285 #endif
 286
 287 //////////////////////////////////////////////////////////////
 288 // Conversion routines
 289 //////////////////////////////////////////////////////////////
 290
 291 void wxDate::julian_to_wday (void)
 292 {
 293     // Correction by Peter Stadel <peters@jetcity.com>
 294         day_of_week = ((julian - 2) % 7L);
 295 /*
 296     day_of_week = (int) ((julian + 2) % 7 + 1);
 297 */
 298 }
 299
 300 void wxDate::julian_to_mdy ()
 301 {
 302     long a,b,c,d,e,z,alpha;
 303     z = julian+1;
 304     // dealing with Gregorian calendar reform
 305     if (z < 2299161L)
 306         a = z;
 307     else {
 308         alpha = (long) ((z-1867216.25) / 36524.25);
 309         a = z + 1 + alpha - alpha/4;
 310     }
 311     b = ( a > 1721423 ? a + 1524 : a + 1158 );
 312     c = (long) ((b - 122.1) / 365.25);
 313     d = (long) (365.25 * c);
 314     e = (long) ((b - d) / 30.6001);
 315     day = (int)(b - d - (long)(30.6001 * e));
 316     month = (int)((e < 13.5) ? e - 1 : e - 13);
 317     year = (int)((month > 2.5 ) ? (c - 4716) : c - 4715);
 318     julian_to_wday ();
 319 }
 320
 321 void wxDate::mdy_to_julian (void)
 322 {
 323     int a,b=0;
 324     int work_month=month, work_day=day, work_year=year;
 325     // correct for negative year
 326     if (work_year < 0)
 327         work_year++;
 328     if (work_month <= 2)
 329     { work_year--; work_month +=12; }
 330
 331     // deal with Gregorian calendar
 332     if (work_year*10000. + work_month*100. + work_day >= 15821015.)
 333     {
 334         a = (int)(work_year/100.);
 335         b = 2 - a + a/4;
 336     }
 337     julian = (long) (365.25*work_year) +
 338         (long) (30.6001 * (work_month+1))  +  work_day + 1720994L + b;
 339     julian_to_wday ();
 340 }
 341
 342 ////////////////////////////////////////////////////////////////
 343 // Format routine
 344 ////////////////////////////////////////////////////////////////
 345
 346 wxString wxDate::FormatDate (int type) const
 347 {
 348     int actualType = type;
 349     if (actualType == -1)
 350         actualType = DisplayFormat;
 351
 352     wxChar buf[40];
 353
 354     memset( buf, '\0', sizeof(buf) );
 355     switch ( actualType )
 356     {
 357         case wxDAY:
 358             if ( (day_of_week < 1) || (day_of_week > 7) )
 359                 wxStrcpy(buf, _("invalid day"));
 360             else
 361                 wxStrncpy( buf, wxGetTranslation(dayname[day_of_week-1]),
 362                            (DisplayOptions & wxDATE_ABBR) ? ABBR_LENGTH : 9);
 363             return wxString(buf);
 364
 365         case wxMONTH:
 366             if ( (month < 1) || (month > 12) )
 367                 wxStrcpy(buf, _("invalid month"));
 368             else
 369                 wxStrncpy( buf, wxGetTranslation(mname[month-1]),
 370                            (DisplayOptions & wxDATE_ABBR) ? ABBR_LENGTH : 9);
 371             return wxString(buf);
 372
 373         case wxFULL:
 374             if ( (month < 1) || (month > 12) || (day_of_week < 0) ||
 375                     (day_of_week > 7) )
 376             {
 377                 wxStrcpy(buf, _("invalid date"));
 378                 return wxString(buf);
 379             }
 380             wxStrncpy( buf, wxGetTranslation(dayname[day_of_week-1]),
 381                        (DisplayOptions & wxDATE_ABBR) ? ABBR_LENGTH : 9);
 382             wxStrcat( buf, wxT(", "));
 383             wxStrncat( buf, wxGetTranslation(mname[month-1]),
 384                        (DisplayOptions & wxDATE_ABBR) ? ABBR_LENGTH : 9);
 385             wxStrcat( buf, wxT(" "));
 386             wxSprintf( buf+wxStrlen(buf), wxT("%d, %d"), day, abs(year) );
 387             if (year < 0)
 388                 wxStrcat(buf,_(" B.C."));
 389             return wxString(buf);
 390
 391         case wxEUROPEAN:
 392             if ( (month < 1) || (month > 12) || (day_of_week < 0) ||
 393                     (day_of_week > 7) )
 394             {
 395                 wxStrcpy(buf, _("invalid date"));
 396                 return wxString(buf);
 397             }
 398             wxSprintf(buf,wxT("%d "),  day);
 399             wxStrncat(buf, wxGetTranslation(mname[month-1]),
 400                     (DisplayOptions & wxDATE_ABBR) ? ABBR_LENGTH : 9);
 401             wxSprintf( buf+wxStrlen(buf), wxT(" %d"), abs(year) );
 402             if (year < 0)
 403                 wxStrcat(buf, _(" B.C."));
 404             return wxString(buf);
 405
 406         case wxMDY:
 407         default:
 408             if (day==0 || month==0 || year==0)
 409                 wxStrcpy(buf, _("invalid date"));
 410             else
 411                 wxSprintf( buf+wxStrlen(buf), wxT("%1d/%1d/%02d"), month, day,
 412                            (DisplayOptions & wxNO_CENTURY) && (abs(year) > 1899)
 413                            ? (abs(year) - (abs(year) / 100 * 100))
 414                            : (abs(year))  );
 415             return wxString(buf);
 416     }
 417     return wxString(wxT(""));
 418 }
 419
 420 void wxDate::SetFormat( int format )
 421 {
 422     DisplayFormat = format;
 423 }
 424
 425 int wxDate::SetOption( int option, bool action )
 426 {
 427     switch ( option )
 428     {
 429         case wxNO_CENTURY:
 430             if ( action )
 431                 DisplayOptions |= wxNO_CENTURY;
 432             else
 433             {
 434                 DisplayOptions &= (~wxNO_CENTURY);
 435             }
 436             return 1;
 437         case wxDATE_ABBR:
 438             if ( action )
 439                 DisplayOptions |= wxDATE_ABBR;
 440             else
 441             {
 442                 DisplayOptions &= (~wxDATE_ABBR);
 443             }
 444             return 1;
 445         default:
 446             return 0;
 447     }
 448     return 0;
 449 }
 450
 451 ///////////////////////////////////////////////////////////////
 452 //  Miscellaneous Routines
 453 ///////////////////////////////////////////////////////////////
 454
 455 long wxDate::GetJulianDate( void ) const
 456 {
 457     return julian;
 458 }
 459
 460 int wxDate::GetDayOfYear( void ) const
 461 {
 462     wxDate temp( 1, 1, year );
 463
 464     return (int) (julian - temp.julian + 1);
 465 }
 466
 467
 468 bool wxDate::IsLeapYear( void ) const
 469 {
 470     return  ( (year >= 1582) ?
 471             (year % 4 == 0  &&  year % 100 != 0  ||  year % 400 == 0 ):
 472             (year % 4 == 0) );
 473 }
 474
 475 // Version 4.0 Extension to Public Interface - CDP
 476
 477 wxDate& wxDate::Set()
 478 {
 479     //#ifdef __WXMSW__
 480 #if 0
 481     struct _dosdate_t sDate;
 482     _dos_getdate(&sDate);
 483
 484     month = sDate.month;
 485     day   = sDate.day;
 486     year  = sDate.year;
 487
 488     mdy_to_julian();
 489 #else
 490     time_t now = time((time_t *) NULL);
 491     struct tm *localTime = localtime(&now);
 492
 493     month = localTime->tm_mon + 1;
 494     day = localTime->tm_mday;
 495     year = localTime->tm_year + 1900;
 496
 497     mdy_to_julian ();
 498 #endif
 499     return *this;
 500 }
 501
 502 wxDate& wxDate::Set(
 503         int  nMonth,
 504         int  nDay,
 505         int  nYear)
 506 {
 507     month = nMonth;
 508     year  = nYear < 0 ? 9999 : nYear;
 509     year  = nYear > 9999 ? 0 : nYear;
 510     day   = nDay < GetDaysInMonth() ? nDay : GetDaysInMonth();
 511
 512     mdy_to_julian();
 513     return *this;
 514 }
 515
 516 wxDate &
 517 wxDate::Set(long j)
 518 {
 519     julian = j;
 520
 521     julian_to_mdy();
 522     return *this;
 523 }
 524
 525
 526 int wxDate::GetDaysInMonth()
 527 {
 528     return GauDays[month-1] + (month==2 && IsLeapYear());
 529 }
 530
 531 int wxDate::GetFirstDayOfMonth() const
 532 {
 533     return wxDate(month, 1, year).GetDayOfWeek();
 534 }
 535
 536 int wxDate::GetDay() const
 537 {
 538     return day;
 539 }
 540
 541 int wxDate::GetDayOfWeek() const
 542 {
 543     return day_of_week;
 544 }
 545
 546 int wxDate::GetYear() const
 547 {
 548     return year;
 549 }
 550
 551 int wxDate::GetMonth() const
 552 {
 553     return month;
 554 }
 555
 556 wxDate& wxDate::AddWeeks(int nCount)
 557 {
 558     Set(julian + (long)nCount*7);
 559     return *this;
 560 }
 561
 562 wxDate& wxDate::AddMonths(int nCount)
 563 {
 564     month += nCount;
 565
 566     if (month < 1) {
 567         month = 12;
 568         year--;
 569     }
 570
 571     if (month > 12) {
 572         month = 1;
 573         year++;
 574     }
 575     mdy_to_julian();
 576     return *this;
 577 }
 578
 579 wxDate& wxDate::AddYears(int nCount)
 580 {
 581     year += nCount;
 582     mdy_to_julian();
 583     return *this;
 584 }
 585
 586 int wxDate::GetWeekOfMonth()
 587 {
 588     // Abs day includes the days from previous month that fills up
 589     // the begin. of the week.
 590     int nAbsDay = day + GetFirstDayOfMonth()-1;
 591     return (nAbsDay-GetDayOfWeek())/7 + 1;
 592 }
 593
 594 int wxDate::GetWeekOfYear()
 595 {
 596     wxDate   doTemp(1, 1, year);
 597     return (int)(((julian - doTemp.julian+1)/7) + 1);
 598 }
 599
 600 wxDate wxDate::GetMonthStart()
 601 {
 602     return(wxDate(month, 1, year));
 603 }
 604
 605 wxDate wxDate::GetMonthEnd()
 606 {
 607     return(wxDate(month+1, 1, year)-1);
 608 }
 609
 610 wxDate wxDate::GetYearStart()
 611 {
 612     return(wxDate(1, 1, year));
 613 }
 614
 615 wxDate wxDate::GetYearEnd()
 616 {
 617     return(wxDate(1, 1, year+1)-1);
 618 }
 619
 620 wxString wxDate::GetMonthName()
 621 {
 622     return(FormatDate(wxMONTH));
 623 }
 624
 625 wxString wxDate::GetDayOfWeekName()
 626 {
 627     return(FormatDate(wxDAY));
 628 }
 629
 630 bool wxDate::IsBetween(const wxDate& first, const wxDate& second) const
 631 {
 632     return (julian >= first.julian && julian <= second.julian);
 633 }
 634
 635 // This function is from NIHCL
 636 wxDate wxDate::Previous(int dayOfWeek) const
 637 {
 638     int this_day_Of_Week, desired_day_Of_Week;
 639     long j;
 640
 641     //      Set the desired and current day of week to start at 0 (Monday)
 642     //      and end at 6 (Sunday).
 643
 644     desired_day_Of_Week = dayOfWeek - 1; // These functions return a value
 645     this_day_Of_Week    = GetDayOfWeek() - 1;            // from 1-7.  Subtract 1 for 0-6.
 646     j = julian;
 647
 648     //      Have to determine how many days difference from current day back to
 649     //      desired, if any.  Special calculation under the 'if' statement to
 650     //      effect the wraparound counting from Monday (0) back to Sunday (6).
 651
 652     if (desired_day_Of_Week > this_day_Of_Week)
 653         this_day_Of_Week += 7 - desired_day_Of_Week;
 654     else
 655         this_day_Of_Week -= desired_day_Of_Week;
 656     j -= this_day_Of_Week; // Adjust j to set it at the desired day of week.
 657     return wxDate(j);
 658 }
 659
 660 #endif