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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #if defined( WNT )
21 : #include <windows.h>
22 : #else
23 : #include <time.h>
24 : #endif
25 :
26 : #include <tools/date.hxx>
27 : #include <sal/log.hxx>
28 :
29 : #ifdef MACOSX
30 : extern "C" {
31 : struct tm *localtime_r(const time_t *timep, struct tm *buffer);
32 : }
33 : #endif
34 :
35 : static const sal_uInt16 aDaysInMonth[12] = { 31, 28, 31, 30, 31, 30,
36 : 31, 31, 30, 31, 30, 31 };
37 :
38 : #define MAX_DAYS 3636532
39 :
40 0 : inline bool ImpIsLeapYear( sal_uInt16 nYear )
41 : {
42 0 : return ( ( ((nYear % 4) == 0) && ((nYear % 100) != 0) ) ||
43 0 : ( (nYear % 400) == 0 ) );
44 : }
45 :
46 : // All callers must have sanitized or normalized month and year values!
47 0 : inline sal_uInt16 ImplDaysInMonth( sal_uInt16 nMonth, sal_uInt16 nYear )
48 : {
49 0 : if ( nMonth != 2 )
50 0 : return aDaysInMonth[nMonth-1];
51 : else
52 : {
53 0 : if (ImpIsLeapYear(nYear))
54 0 : return aDaysInMonth[nMonth-1] + 1;
55 : else
56 0 : return aDaysInMonth[nMonth-1];
57 : }
58 : }
59 :
60 : // static
61 0 : sal_uInt16 Date::GetDaysInMonth( sal_uInt16 nMonth, sal_uInt16 nYear )
62 : {
63 : SAL_WARN_IF( nMonth < 1 || 12 < nMonth, "tools", "Date::GetDaysInMonth - nMonth out of bounds " << nMonth);
64 0 : if (nMonth < 1)
65 0 : nMonth = 1;
66 0 : else if (12 < nMonth)
67 0 : nMonth = 12;
68 0 : return ImplDaysInMonth( nMonth, nYear);
69 : }
70 :
71 0 : long Date::DateToDays( sal_uInt16 nDay, sal_uInt16 nMonth, sal_uInt16 nYear )
72 : {
73 : long nDays;
74 :
75 0 : Normalize( nDay, nMonth, nYear);
76 :
77 0 : nDays = ((sal_uIntPtr)nYear-1) * 365;
78 0 : nDays += ((nYear-1) / 4) - ((nYear-1) / 100) + ((nYear-1) / 400);
79 0 : for( sal_uInt16 i = 1; i < nMonth; i++ )
80 0 : nDays += ImplDaysInMonth(i,nYear);
81 0 : nDays += nDay;
82 0 : return nDays;
83 : }
84 :
85 0 : static void DaysToDate( long nDays,
86 : sal_uInt16& rDay, sal_uInt16& rMonth, sal_uInt16& rYear )
87 : {
88 : long nTempDays;
89 0 : long i = 0;
90 : bool bCalc;
91 :
92 0 : do
93 : {
94 0 : nTempDays = (long)nDays;
95 0 : rYear = (sal_uInt16)((nTempDays / 365) - i);
96 0 : nTempDays -= ((sal_uIntPtr)rYear-1) * 365;
97 0 : nTempDays -= ((rYear-1) / 4) - ((rYear-1) / 100) + ((rYear-1) / 400);
98 0 : bCalc = false;
99 0 : if ( nTempDays < 1 )
100 : {
101 0 : i++;
102 0 : bCalc = true;
103 : }
104 : else
105 : {
106 0 : if ( nTempDays > 365 )
107 : {
108 0 : if ( (nTempDays != 366) || !ImpIsLeapYear( rYear ) )
109 : {
110 0 : i--;
111 0 : bCalc = true;
112 : }
113 : }
114 : }
115 : }
116 : while ( bCalc );
117 :
118 0 : rMonth = 1;
119 0 : while ( (sal_uIntPtr)nTempDays > ImplDaysInMonth( rMonth, rYear ) )
120 : {
121 0 : nTempDays -= ImplDaysInMonth( rMonth, rYear );
122 0 : rMonth++;
123 : }
124 0 : rDay = (sal_uInt16)nTempDays;
125 0 : }
126 :
127 0 : Date::Date( DateInitSystem )
128 : {
129 : #if defined WNT
130 : SYSTEMTIME aDateTime;
131 : GetLocalTime( &aDateTime );
132 :
133 : // Combine to date
134 : nDate = ((sal_uIntPtr)aDateTime.wDay) +
135 : (((sal_uIntPtr)aDateTime.wMonth)*100) +
136 : (((sal_uIntPtr)aDateTime.wYear)*10000);
137 : #else
138 : time_t nTmpTime;
139 : struct tm aTime;
140 :
141 : // get current time
142 0 : nTmpTime = time( 0 );
143 :
144 : // compute date
145 0 : if ( localtime_r( &nTmpTime, &aTime ) )
146 : {
147 : nDate = ((sal_uIntPtr)aTime.tm_mday) +
148 0 : (((sal_uIntPtr)(aTime.tm_mon+1))*100) +
149 0 : (((sal_uIntPtr)(aTime.tm_year+1900))*10000);
150 : }
151 : else
152 0 : nDate = 1 + 100 + (((sal_uIntPtr)1900)*10000);
153 : #endif
154 0 : }
155 :
156 0 : void Date::SetDay( sal_uInt16 nNewDay )
157 : {
158 0 : sal_uIntPtr nMonth = GetMonth();
159 0 : sal_uIntPtr nYear = GetYear();
160 :
161 0 : nDate = ((sal_uIntPtr)(nNewDay%100)) + (nMonth*100) + (nYear*10000);
162 0 : }
163 :
164 0 : void Date::SetMonth( sal_uInt16 nNewMonth )
165 : {
166 0 : sal_uIntPtr nDay = GetDay();
167 0 : sal_uIntPtr nYear = GetYear();
168 :
169 0 : nDate = nDay + (((sal_uIntPtr)(nNewMonth%100))*100) + (nYear*10000);
170 0 : }
171 :
172 0 : void Date::SetYear( sal_uInt16 nNewYear )
173 : {
174 0 : sal_uIntPtr nDay = GetDay();
175 0 : sal_uIntPtr nMonth = GetMonth();
176 :
177 0 : nDate = nDay + (nMonth*100) + (((sal_uIntPtr)(nNewYear%10000))*10000);
178 0 : }
179 :
180 0 : DayOfWeek Date::GetDayOfWeek() const
181 : {
182 0 : return (DayOfWeek)((sal_uIntPtr)(DateToDays( GetDay(), GetMonth(), GetYear() )-1) % 7);
183 : }
184 :
185 0 : sal_uInt16 Date::GetDayOfYear() const
186 : {
187 0 : sal_uInt16 nDay = GetDay();
188 0 : sal_uInt16 nMonth = GetMonth();
189 0 : sal_uInt16 nYear = GetYear();
190 0 : Normalize( nDay, nMonth, nYear);
191 :
192 0 : for( sal_uInt16 i = 1; i < nMonth; i++ )
193 0 : nDay = nDay + ::ImplDaysInMonth( i, nYear ); // += yields a warning on MSVC, so don't use it
194 0 : return nDay;
195 : }
196 :
197 0 : sal_uInt16 Date::GetWeekOfYear( DayOfWeek eStartDay,
198 : sal_Int16 nMinimumNumberOfDaysInWeek ) const
199 : {
200 : short nWeek;
201 0 : short n1WDay = (short)Date( 1, 1, GetYear() ).GetDayOfWeek();
202 0 : short nDayOfYear = (short)GetDayOfYear();
203 :
204 : // weekdays start at 0, thus decrement one
205 0 : nDayOfYear--;
206 : // account for StartDay
207 0 : n1WDay = (n1WDay+(7-(short)eStartDay)) % 7;
208 :
209 0 : if (nMinimumNumberOfDaysInWeek < 1 || 7 < nMinimumNumberOfDaysInWeek)
210 : {
211 : SAL_WARN( "tools.datetime", "Date::GetWeekOfYear: invalid nMinimumNumberOfDaysInWeek" );
212 0 : nMinimumNumberOfDaysInWeek = 4;
213 : }
214 :
215 0 : if ( nMinimumNumberOfDaysInWeek == 1 )
216 : {
217 0 : nWeek = ((n1WDay+nDayOfYear)/7) + 1;
218 : // Set to 53rd week only if we're not in the
219 : // first week of the new year
220 0 : if ( nWeek == 54 )
221 0 : nWeek = 1;
222 0 : else if ( nWeek == 53 )
223 : {
224 0 : short nDaysInYear = (short)GetDaysInYear();
225 0 : short nDaysNextYear = (short)Date( 1, 1, GetYear()+1 ).GetDayOfWeek();
226 0 : nDaysNextYear = (nDaysNextYear+(7-(short)eStartDay)) % 7;
227 0 : if ( nDayOfYear > (nDaysInYear-nDaysNextYear-1) )
228 0 : nWeek = 1;
229 : }
230 : }
231 0 : else if ( nMinimumNumberOfDaysInWeek == 7 )
232 : {
233 0 : nWeek = ((n1WDay+nDayOfYear)/7);
234 : // First week of a year is equal to the last week of the previous year
235 0 : if ( nWeek == 0 )
236 : {
237 0 : Date aLastDatePrevYear( 31, 12, GetYear()-1 );
238 0 : nWeek = aLastDatePrevYear.GetWeekOfYear( eStartDay, nMinimumNumberOfDaysInWeek );
239 : }
240 : }
241 : else // ( nMinimumNumberOfDaysInWeek == somehing_else, commentary examples for 4 )
242 : {
243 : // x_monday - thursday
244 0 : if ( n1WDay < nMinimumNumberOfDaysInWeek )
245 0 : nWeek = 1;
246 : // Friday
247 0 : else if ( n1WDay == nMinimumNumberOfDaysInWeek )
248 0 : nWeek = 53;
249 : // Saturday
250 0 : else if ( n1WDay == nMinimumNumberOfDaysInWeek + 1 )
251 : {
252 : // Year after leapyear
253 0 : if ( Date( 1, 1, GetYear()-1 ).IsLeapYear() )
254 0 : nWeek = 53;
255 : else
256 0 : nWeek = 52;
257 : }
258 : // Sunday
259 : else
260 0 : nWeek = 52;
261 :
262 0 : if ( (nWeek == 1) || (nDayOfYear + n1WDay > 6) )
263 : {
264 0 : if ( nWeek == 1 )
265 0 : nWeek += (nDayOfYear + n1WDay) / 7;
266 : else
267 0 : nWeek = (nDayOfYear + n1WDay) / 7;
268 0 : if ( nWeek == 53 )
269 : {
270 : // next x_Sunday == first x_Sunday in the new year
271 : // == still the same week!
272 0 : long nTempDays = DateToDays( GetDay(), GetMonth(), GetYear() );
273 0 : nTempDays += 6 - (GetDayOfWeek()+(7-(short)eStartDay)) % 7;
274 : sal_uInt16 nDay;
275 : sal_uInt16 nMonth;
276 : sal_uInt16 nYear;
277 0 : DaysToDate( nTempDays, nDay, nMonth, nYear );
278 0 : nWeek = Date( nDay, nMonth, nYear ).GetWeekOfYear( eStartDay, nMinimumNumberOfDaysInWeek );
279 : }
280 : }
281 : }
282 :
283 0 : return (sal_uInt16)nWeek;
284 : }
285 :
286 0 : sal_uInt16 Date::GetDaysInMonth() const
287 : {
288 0 : sal_uInt16 nDay = GetDay();
289 0 : sal_uInt16 nMonth = GetMonth();
290 0 : sal_uInt16 nYear = GetYear();
291 0 : Normalize( nDay, nMonth, nYear);
292 :
293 0 : return ImplDaysInMonth( nMonth, nYear );
294 : }
295 :
296 0 : bool Date::IsLeapYear() const
297 : {
298 0 : sal_uInt16 nYear = GetYear();
299 0 : return ImpIsLeapYear( nYear );
300 : }
301 :
302 0 : bool Date::IsValidAndGregorian() const
303 : {
304 0 : sal_uInt16 nDay = GetDay();
305 0 : sal_uInt16 nMonth = GetMonth();
306 0 : sal_uInt16 nYear = GetYear();
307 :
308 0 : if ( !nMonth || (nMonth > 12) )
309 0 : return false;
310 0 : if ( !nDay || (nDay > ImplDaysInMonth( nMonth, nYear )) )
311 0 : return false;
312 0 : else if ( nYear <= 1582 )
313 : {
314 0 : if ( nYear < 1582 )
315 0 : return false;
316 0 : else if ( nMonth < 10 )
317 0 : return false;
318 0 : else if ( (nMonth == 10) && (nDay < 15) )
319 0 : return false;
320 : }
321 :
322 0 : return true;
323 : }
324 :
325 0 : bool Date::IsValidDate() const
326 : {
327 0 : return IsValidDate( GetDay(), GetMonth(), GetYear());
328 : }
329 :
330 : //static
331 0 : bool Date::IsValidDate( sal_uInt16 nDay, sal_uInt16 nMonth, sal_uInt16 nYear )
332 : {
333 0 : if ( !nMonth || (nMonth > 12) )
334 0 : return false;
335 0 : if ( !nDay || (nDay > ImplDaysInMonth( nMonth, nYear )) )
336 0 : return false;
337 0 : return true;
338 : }
339 :
340 0 : bool Date::Normalize()
341 : {
342 0 : sal_uInt16 nDay = GetDay();
343 0 : sal_uInt16 nMonth = GetMonth();
344 0 : sal_uInt16 nYear = GetYear();
345 :
346 0 : if (!Normalize( nDay, nMonth, nYear))
347 0 : return false;
348 :
349 0 : SetDay( nDay);
350 0 : SetMonth( nMonth);
351 0 : SetYear( nYear);
352 :
353 0 : return true;
354 : }
355 :
356 : //static
357 0 : bool Date::Normalize( sal_uInt16 & rDay, sal_uInt16 & rMonth, sal_uInt16 & rYear )
358 : {
359 0 : if (IsValidDate( rDay, rMonth, rYear))
360 0 : return false;
361 :
362 0 : if (rMonth > 12)
363 : {
364 0 : rYear += rMonth / 12;
365 0 : rMonth = rMonth % 12;
366 : }
367 0 : if (!rMonth)
368 : {
369 0 : if (!rYear)
370 : {
371 0 : rYear = 0;
372 0 : rMonth = 1;
373 0 : if (rDay > 31)
374 0 : rDay -= 31;
375 : else
376 0 : rDay = 1;
377 : }
378 : else
379 : {
380 0 : --rYear;
381 0 : rMonth = 12;
382 : }
383 : }
384 : sal_uInt16 nDays;
385 0 : while (rDay > (nDays = ImplDaysInMonth( rMonth, rYear)))
386 : {
387 0 : rDay -= nDays;
388 0 : if (rMonth < 12)
389 0 : ++rMonth;
390 : else
391 : {
392 0 : ++rYear;
393 0 : rMonth = 1;
394 : }
395 : }
396 0 : if (rYear > 9999)
397 : {
398 0 : rDay = 31;
399 0 : rMonth = 12;
400 0 : rYear = 9999;
401 : }
402 0 : return true;
403 : }
404 :
405 0 : Date& Date::operator +=( long nDays )
406 : {
407 : sal_uInt16 nDay;
408 : sal_uInt16 nMonth;
409 : sal_uInt16 nYear;
410 :
411 0 : if (nDays == 0)
412 0 : return *this;
413 :
414 0 : long nTempDays = DateToDays( GetDay(), GetMonth(), GetYear() );
415 :
416 0 : nTempDays += nDays;
417 0 : if ( nTempDays > MAX_DAYS )
418 0 : nDate = 31 + (12*100) + (((sal_uIntPtr)9999)*10000);
419 0 : else if ( nTempDays <= 0 )
420 0 : nDate = 1 + 100;
421 : else
422 : {
423 0 : DaysToDate( nTempDays, nDay, nMonth, nYear );
424 0 : nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
425 : }
426 :
427 0 : return *this;
428 : }
429 :
430 0 : Date& Date::operator -=( long nDays )
431 : {
432 : sal_uInt16 nDay;
433 : sal_uInt16 nMonth;
434 : sal_uInt16 nYear;
435 :
436 0 : if (nDays == 0)
437 0 : return *this;
438 :
439 0 : long nTempDays = DateToDays( GetDay(), GetMonth(), GetYear() );
440 :
441 0 : nTempDays -= nDays;
442 0 : if ( nTempDays > MAX_DAYS )
443 0 : nDate = 31 + (12*100) + (((sal_uIntPtr)9999)*10000);
444 0 : else if ( nTempDays <= 0 )
445 0 : nDate = 1 + 100;
446 : else
447 : {
448 0 : DaysToDate( nTempDays, nDay, nMonth, nYear );
449 0 : nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
450 : }
451 :
452 0 : return *this;
453 : }
454 :
455 0 : Date& Date::operator ++()
456 : {
457 : sal_uInt16 nDay;
458 : sal_uInt16 nMonth;
459 : sal_uInt16 nYear;
460 0 : long nTempDays = DateToDays( GetDay(), GetMonth(), GetYear() );
461 :
462 0 : if ( nTempDays < MAX_DAYS )
463 : {
464 0 : nTempDays++;
465 0 : DaysToDate( nTempDays, nDay, nMonth, nYear );
466 0 : nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
467 : }
468 :
469 0 : return *this;
470 : }
471 :
472 0 : Date& Date::operator --()
473 : {
474 : sal_uInt16 nDay;
475 : sal_uInt16 nMonth;
476 : sal_uInt16 nYear;
477 0 : long nTempDays = DateToDays( GetDay(), GetMonth(), GetYear() );
478 :
479 0 : if ( nTempDays > 1 )
480 : {
481 0 : nTempDays--;
482 0 : DaysToDate( nTempDays, nDay, nMonth, nYear );
483 0 : nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
484 : }
485 0 : return *this;
486 : }
487 :
488 0 : Date Date::operator ++( int )
489 : {
490 0 : Date aOldDate = *this;
491 0 : Date::operator++();
492 0 : return aOldDate;
493 : }
494 :
495 0 : Date Date::operator --( int )
496 : {
497 0 : Date aOldDate = *this;
498 0 : Date::operator--();
499 0 : return aOldDate;
500 : }
501 :
502 0 : Date operator +( const Date& rDate, long nDays )
503 : {
504 0 : Date aDate( rDate );
505 0 : aDate += nDays;
506 0 : return aDate;
507 : }
508 :
509 0 : Date operator -( const Date& rDate, long nDays )
510 : {
511 0 : Date aDate( rDate );
512 0 : aDate -= nDays;
513 0 : return aDate;
514 : }
515 :
516 0 : long operator -( const Date& rDate1, const Date& rDate2 )
517 : {
518 0 : sal_uIntPtr nTempDays1 = Date::DateToDays( rDate1.GetDay(), rDate1.GetMonth(),
519 0 : rDate1.GetYear() );
520 0 : sal_uIntPtr nTempDays2 = Date::DateToDays( rDate2.GetDay(), rDate2.GetMonth(),
521 0 : rDate2.GetYear() );
522 0 : return nTempDays1 - nTempDays2;
523 : }
524 :
525 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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