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