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| Source at commit 1322 created 12 years 8 months ago. By meklort, Add doxygen to utils folder | |
|---|---|
| 1 | /****************************************************************************␊ |
| 2 | ** ␊ |
| 3 | **␊ |
| 4 | ** Implementation of date and time classes␊ |
| 5 | **␊ |
| 6 | ** Created : 940124␊ |
| 7 | **␊ |
| 8 | ** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.␊ |
| 9 | **␊ |
| 10 | ** This file is part of the tools module of the Qt GUI Toolkit.␊ |
| 11 | **␊ |
| 12 | ** This file may be distributed under the terms of the Q Public License␊ |
| 13 | ** as defined by Trolltech AS of Norway and appearing in the file␊ |
| 14 | ** LICENSE.QPL included in the packaging of this file.␊ |
| 15 | **␊ |
| 16 | ** This file may be distributed and/or modified under the terms of the␊ |
| 17 | ** GNU General Public License version 2 as published by the Free Software␊ |
| 18 | ** Foundation and appearing in the file LICENSE.GPL included in the␊ |
| 19 | ** packaging of this file.␊ |
| 20 | **␊ |
| 21 | ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition␊ |
| 22 | ** licenses may use this file in accordance with the Qt Commercial License␊ |
| 23 | ** Agreement provided with the Software.␊ |
| 24 | **␊ |
| 25 | ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE␊ |
| 26 | ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.␊ |
| 27 | **␊ |
| 28 | ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for␊ |
| 29 | ** information about Qt Commercial License Agreements.␊ |
| 30 | ** See http://www.trolltech.com/qpl/ for QPL licensing information.␊ |
| 31 | ** See http://www.trolltech.com/gpl/ for GPL licensing information.␊ |
| 32 | **␊ |
| 33 | ** Contact info@trolltech.com if any conditions of this licensing are␊ |
| 34 | ** not clear to you.␊ |
| 35 | **␊ |
| 36 | **********************************************************************/␊ |
| 37 | ␊ |
| 38 | #define gettimeofday␉__hide_gettimeofday␊ |
| 39 | #include "qdatetime.h"␊ |
| 40 | #include "qdatastream.h"␊ |
| 41 | #include <stdio.h>␊ |
| 42 | #include <time.h>␊ |
| 43 | #if defined(_OS_WIN32_)␊ |
| 44 | #if defined(_CC_BOOL_DEF_)␊ |
| 45 | #undef␉bool␊ |
| 46 | #include <windows.h>␊ |
| 47 | #define bool int␊ |
| 48 | #else␊ |
| 49 | #include <windows.h>␊ |
| 50 | #endif␊ |
| 51 | #elif defined(_OS_MSDOS_)␊ |
| 52 | #include <dos.h>␊ |
| 53 | #elif defined(_OS_OS2_)␊ |
| 54 | #include <os2.h>␊ |
| 55 | #elif defined(_OS_UNIX_)␊ |
| 56 | #include <sys/time.h>␊ |
| 57 | #include <unistd.h>␊ |
| 58 | #undef␉gettimeofday␊ |
| 59 | extern "C" int gettimeofday( struct timeval *, struct timezone * );␊ |
| 60 | #endif␊ |
| 61 | ␊ |
| 62 | static const uint FIRST_DAY␉= 2361222;␉// Julian day for 1752/09/14␊ |
| 63 | static const int FIRST_YEAR␉= 1752;␉␉// ### wrong for many countries␊ |
| 64 | static const uint SECS_PER_DAY␉= 86400;␊ |
| 65 | static const uint MSECS_PER_DAY = 86400000;␊ |
| 66 | static const uint SECS_PER_HOUR = 3600;␊ |
| 67 | static const uint MSECS_PER_HOUR= 3600000;␊ |
| 68 | static const uint SECS_PER_MIN␉= 60;␊ |
| 69 | static const uint MSECS_PER_MIN = 60000;␊ |
| 70 | ␊ |
| 71 | static const short monthDays[] ={0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};␊ |
| 72 | ␊ |
| 73 | // ##### Localize.␊ |
| 74 | ␊ |
| 75 | const char * const QDate::monthNames[] = {␊ |
| 76 | "Jan", "Feb", "Mar", "Apr", "May", "Jun",␊ |
| 77 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };␊ |
| 78 | ␊ |
| 79 | const char * const QDate::weekdayNames[] ={␊ |
| 80 | "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };␊ |
| 81 | ␊ |
| 82 | ␊ |
| 83 | /*****************************************************************************␊ |
| 84 | QDate member functions␊ |
| 85 | *****************************************************************************/␊ |
| 86 | ␊ |
| 87 | // REVISED: aavit␊ |
| 88 | ␊ |
| 89 | /*!␊ |
| 90 | \class QDate qdatetime.h␊ |
| 91 | \brief The QDate class provides date functions.␊ |
| 92 | ␊ |
| 93 | \ingroup time␊ |
| 94 | ␊ |
| 95 | A QDate object contains a calendar date, i.e. year, month, and day␊ |
| 96 | numbers in the modern western (Gregorian) calendar. It can read the␊ |
| 97 | current date from the system clock. It provides functions for␊ |
| 98 | comparing dates and for manipulating a date by adding a number of␊ |
| 99 | days.␊ |
| 100 | ␊ |
| 101 | A QDate object is typically created either by giving the year, month␊ |
| 102 | and day numbers explicitly, or by using the static function␊ |
| 103 | currentDate(), which makes a QDate object which contains the␊ |
| 104 | system's clock date. An explicit date can also be set using␊ |
| 105 | setYMD().␊ |
| 106 | ␊ |
| 107 | The year(), month(), and day() functions provide access to the year,␊ |
| 108 | month, and day numbers. Also, dayOfWeek() and dayOfYear() functions␊ |
| 109 | are provided. The same information is provided in textual format by␊ |
| 110 | the toString(), dayName(), and monthName() functions.␊ |
| 111 | ␊ |
| 112 | QDate provides a full set of operators to compare two QDate␊ |
| 113 | objects. A date is considered smaller than another if it is earlier␊ |
| 114 | than the other.␊ |
| 115 | ␊ |
| 116 | The date a given number of days later than a given date can be found␊ |
| 117 | using the addDays() function. Correspondingly, the number of days␊ |
| 118 | between two dates can be found using the daysTo() function.␊ |
| 119 | ␊ |
| 120 | The daysInMonth() and daysInYear() functions tell how many days␊ |
| 121 | there are in this date's month and year, respectively. The␊ |
| 122 | isLeapYear() function tells whether this date is in a leap year.␊ |
| 123 | ␊ |
| 124 | Note that QDate may not be used for date calculations for dates in␊ |
| 125 | the remote past, i.e. prior to the introduction of the Gregorian␊ |
| 126 | calendar. This calendar was adopted by England Sep. 14. 1752 (hence␊ |
| 127 | this is the earliest valid QDate), and subsequently by most other␊ |
| 128 | western countries, until 1923.␊ |
| 129 | ␊ |
| 130 | The end of time is reached around 8000AD, by which time we expect Qt␊ |
| 131 | to be obsolete.␊ |
| 132 | ␊ |
| 133 | \sa QTime, QDateTime␊ |
| 134 | */␊ |
| 135 | ␊ |
| 136 | ␊ |
| 137 | /*!␊ |
| 138 | \fn QDate::QDate()␊ |
| 139 | Constructs a null date. Null dates are invalid.␊ |
| 140 | ␊ |
| 141 | \sa isNull(), isValid()␊ |
| 142 | */␊ |
| 143 | ␊ |
| 144 | ␊ |
| 145 | /*!␊ |
| 146 | Constructs a date with the year \a y, month \a m and day \a d.␊ |
| 147 | ␊ |
| 148 | \a y must be in the range 1752-ca. 8000, \a m must be in the range␊ |
| 149 | 1-12, and \a d must be in the range 1-31. Exception: if \a y is in␊ |
| 150 | the range 0-99, it is interpreted as 1900-1999.␊ |
| 151 | ␊ |
| 152 | \sa isValid()␊ |
| 153 | */␊ |
| 154 | ␊ |
| 155 | QDate::QDate( int y, int m, int d )␊ |
| 156 | {␊ |
| 157 | jd = 0;␊ |
| 158 | setYMD( y, m, d );␊ |
| 159 | }␊ |
| 160 | ␊ |
| 161 | ␊ |
| 162 | /*!␊ |
| 163 | \fn bool QDate::isNull() const␊ |
| 164 | ␊ |
| 165 | Returns TRUE if the date is null. A null date is invalid.␊ |
| 166 | ␊ |
| 167 | \sa isValid()␊ |
| 168 | */␊ |
| 169 | ␊ |
| 170 | ␊ |
| 171 | /*!␊ |
| 172 | Returns TRUE if this date is valid.␊ |
| 173 | ␊ |
| 174 | \sa isNull()␊ |
| 175 | */␊ |
| 176 | ␊ |
| 177 | bool QDate::isValid() const␊ |
| 178 | {␊ |
| 179 | return jd >= FIRST_DAY;␊ |
| 180 | }␊ |
| 181 | ␊ |
| 182 | ␊ |
| 183 | /*!␊ |
| 184 | Returns the year (>= 1752) of this date.␊ |
| 185 | ␊ |
| 186 | \sa month(), day()␊ |
| 187 | */␊ |
| 188 | ␊ |
| 189 | int QDate::year() const␊ |
| 190 | {␊ |
| 191 | int y, m, d;␊ |
| 192 | jul2greg( jd, y, m, d );␊ |
| 193 | return y;␊ |
| 194 | }␊ |
| 195 | ␊ |
| 196 | /*!␊ |
| 197 | Returns the month (January=1 .. December=12) of this date.␊ |
| 198 | ␊ |
| 199 | \sa year(), day()␊ |
| 200 | */␊ |
| 201 | ␊ |
| 202 | int QDate::month() const␊ |
| 203 | {␊ |
| 204 | int y, m, d;␊ |
| 205 | jul2greg( jd, y, m, d );␊ |
| 206 | return m;␊ |
| 207 | }␊ |
| 208 | ␊ |
| 209 | /*!␊ |
| 210 | Returns the day of the month (1..31) of this date.␊ |
| 211 | ␊ |
| 212 | \sa year(), month(), dayOfWeek()␊ |
| 213 | */␊ |
| 214 | ␊ |
| 215 | int QDate::day() const␊ |
| 216 | {␊ |
| 217 | int y, m, d;␊ |
| 218 | jul2greg( jd, y, m, d );␊ |
| 219 | return d;␊ |
| 220 | }␊ |
| 221 | ␊ |
| 222 | /*!␊ |
| 223 | Returns the weekday (Monday=1 .. Sunday=7) for this date.␊ |
| 224 | ␊ |
| 225 | \sa day(), dayOfYear()␊ |
| 226 | */␊ |
| 227 | ␊ |
| 228 | int QDate::dayOfWeek() const␊ |
| 229 | {␊ |
| 230 | return (((jd+1) % 7) + 6)%7 + 1;␊ |
| 231 | }␊ |
| 232 | ␊ |
| 233 | /*!␊ |
| 234 | Returns the day of the year (1..365) for this date.␊ |
| 235 | ␊ |
| 236 | \sa day(), dayOfWeek()␊ |
| 237 | */␊ |
| 238 | ␊ |
| 239 | int QDate::dayOfYear() const␊ |
| 240 | {␊ |
| 241 | return jd - greg2jul(year(), 1, 1) + 1;␊ |
| 242 | }␊ |
| 243 | ␊ |
| 244 | /*!␊ |
| 245 | Returns the number of days in the month (28..31) for this date.␊ |
| 246 | ␊ |
| 247 | \sa day(), daysInYear()␊ |
| 248 | */␊ |
| 249 | ␊ |
| 250 | int QDate::daysInMonth() const␊ |
| 251 | {␊ |
| 252 | int y, m, d;␊ |
| 253 | jul2greg( jd, y, m, d );␊ |
| 254 | if ( m == 2 && leapYear(y) )␊ |
| 255 | ␉return 29;␊ |
| 256 | else␊ |
| 257 | ␉return monthDays[m];␊ |
| 258 | }␊ |
| 259 | ␊ |
| 260 | /*!␊ |
| 261 | Returns the number of days in the year (365 or 366) for this date.␊ |
| 262 | ␊ |
| 263 | \sa day(), daysInMonth()␊ |
| 264 | */␊ |
| 265 | ␊ |
| 266 | int QDate::daysInYear() const␊ |
| 267 | {␊ |
| 268 | int y, m, d;␊ |
| 269 | jul2greg( jd, y, m, d );␊ |
| 270 | return leapYear(y) ? 366 : 365;␊ |
| 271 | }␊ |
| 272 | ␊ |
| 273 | ␊ |
| 274 | /*!␊ |
| 275 | Returns the name of the \a month.␊ |
| 276 | ␊ |
| 277 | Month 1 == "Jan", month 2 == "Feb" etc.␊ |
| 278 | ␊ |
| 279 | \sa toString(), dayName()␊ |
| 280 | */␊ |
| 281 | ␊ |
| 282 | QString QDate::monthName( int month ) const␊ |
| 283 | {␊ |
| 284 | #if defined(CHECK_RANGE)␊ |
| 285 | if ( month < 1 || month > 12 ) {␊ |
| 286 | ␉qWarning( "QDate::monthName: Parameter out ouf range." );␊ |
| 287 | ␉month = 1;␊ |
| 288 | }␊ |
| 289 | #endif␊ |
| 290 | // ### Remove the fromLatin1 during localization␊ |
| 291 | return QString::fromLatin1(monthNames[month-1]);␊ |
| 292 | }␊ |
| 293 | ␊ |
| 294 | /*!␊ |
| 295 | Returns the name of the \a weekday.␊ |
| 296 | ␊ |
| 297 | Weekday 1 == "Mon", day 2 == "Tue" etc.␊ |
| 298 | ␊ |
| 299 | \sa toString(), monthName()␊ |
| 300 | */␊ |
| 301 | ␊ |
| 302 | QString QDate::dayName( int weekday ) const␊ |
| 303 | {␊ |
| 304 | #if defined(CHECK_RANGE)␊ |
| 305 | if ( weekday < 1 || weekday > 7 ) {␊ |
| 306 | ␉qWarning( "QDate::dayName: Parameter out of range." );␊ |
| 307 | ␉weekday = 1;␊ |
| 308 | }␊ |
| 309 | #endif␊ |
| 310 | // ### Remove the fromLatin1 during localization␊ |
| 311 | return QString::fromLatin1(weekdayNames[weekday-1]);␊ |
| 312 | }␊ |
| 313 | ␊ |
| 314 | ␊ |
| 315 | /*!␊ |
| 316 | Returns the date as a string.␊ |
| 317 | ␊ |
| 318 | The string format is "Sat May 20 1995". This function uses the␊ |
| 319 | dayName() and monthName() functions to generate the string.␊ |
| 320 | ␊ |
| 321 | \sa dayName(), monthName()␊ |
| 322 | */␊ |
| 323 | ␊ |
| 324 | QString QDate::toString() const␊ |
| 325 | {␊ |
| 326 | int y, m, d;␊ |
| 327 | jul2greg( jd, y, m, d );␊ |
| 328 | QString buf = dayName(dayOfWeek());␊ |
| 329 | buf += ' ';␊ |
| 330 | buf += monthName(m);␊ |
| 331 | QString t;␊ |
| 332 | t.sprintf( " %d %d", d, y);␊ |
| 333 | buf += t;␊ |
| 334 | return buf;␊ |
| 335 | }␊ |
| 336 | ␊ |
| 337 | ␊ |
| 338 | /*!␊ |
| 339 | Sets the year \a y, month \a m and day \a d.␊ |
| 340 | ␊ |
| 341 | \a y must be in the range 1752-ca. 8000, \a m must be in the range␊ |
| 342 | 1-12, and \a d must be in the range 1-31. Exception: if \a y is in␊ |
| 343 | the range 0-99, it is interpreted as 1900-1999.␊ |
| 344 | ␊ |
| 345 | Returns TRUE if the date is valid, otherwise FALSE.␊ |
| 346 | */␊ |
| 347 | ␊ |
| 348 | bool QDate::setYMD( int y, int m, int d )␊ |
| 349 | {␊ |
| 350 | if ( !isValid(y,m,d) ) {␊ |
| 351 | #if defined(CHECK_RANGE)␊ |
| 352 | ␉ qWarning( "QDate::setYMD: Invalid date %04d/%02d/%02d", y, m, d );␊ |
| 353 | #endif␊ |
| 354 | ␉ return FALSE;␊ |
| 355 | }␊ |
| 356 | jd = greg2jul( y, m, d );␊ |
| 357 | #if defined(DEBUG)␊ |
| 358 | ASSERT( year() == (y > 99 ? y : 1900+y) && month() == m && day() == d );␊ |
| 359 | #endif␊ |
| 360 | return TRUE;␊ |
| 361 | }␊ |
| 362 | ␊ |
| 363 | /*!␊ |
| 364 | Returns a QDate object containing a date \a ndays later than the␊ |
| 365 | date of this object (or earlier if \a ndays is negative).␊ |
| 366 | ␊ |
| 367 | \sa daysTo()␊ |
| 368 | */␊ |
| 369 | ␊ |
| 370 | QDate QDate::addDays( int ndays ) const␊ |
| 371 | {␊ |
| 372 | QDate d;␊ |
| 373 | d.jd = jd + ndays;␊ |
| 374 | return d;␊ |
| 375 | }␊ |
| 376 | ␊ |
| 377 | /*!␊ |
| 378 | Returns the number of days from this date to \a d (which is negative␊ |
| 379 | if \a d is earlier than this date).␊ |
| 380 | ␊ |
| 381 | Example:␊ |
| 382 | \code␊ |
| 383 | QDate d1( 1995, 5, 17 );␉␉// May 17th 1995␊ |
| 384 | QDate d2( 1995, 5, 20 );␉␉// May 20th 1995␊ |
| 385 | d1.daysTo( d2 );␉␉␉// returns 3␊ |
| 386 | d2.daysTo( d1 );␉␉␉// returns -3␊ |
| 387 | \endcode␊ |
| 388 | ␊ |
| 389 | \sa addDays()␊ |
| 390 | */␊ |
| 391 | ␊ |
| 392 | int QDate::daysTo( const QDate &d ) const␊ |
| 393 | {␊ |
| 394 | return d.jd - jd;␊ |
| 395 | }␊ |
| 396 | ␊ |
| 397 | ␊ |
| 398 | /*!␊ |
| 399 | \fn bool QDate::operator==( const QDate &d ) const␊ |
| 400 | Returns TRUE if this date is equal to \a d, or FALSE if␊ |
| 401 | they are different.␊ |
| 402 | */␊ |
| 403 | ␊ |
| 404 | /*!␊ |
| 405 | \fn bool QDate::operator!=( const QDate &d ) const␊ |
| 406 | Returns TRUE if this date is different from \a d, or FALSE if␊ |
| 407 | they are equal.␊ |
| 408 | */␊ |
| 409 | ␊ |
| 410 | /*!␊ |
| 411 | \fn bool QDate::operator<( const QDate &d ) const␊ |
| 412 | Returns TRUE if this date is earlier than \a d, otherwise FALSE.␊ |
| 413 | */␊ |
| 414 | ␊ |
| 415 | /*!␊ |
| 416 | \fn bool QDate::operator<=( const QDate &d ) const␊ |
| 417 | Returns TRUE if this date is earlier than or equal to \a d, otherwise FALSE.␊ |
| 418 | */␊ |
| 419 | ␊ |
| 420 | /*!␊ |
| 421 | \fn bool QDate::operator>( const QDate &d ) const␊ |
| 422 | Returns TRUE if this date is later than \a d, otherwise FALSE.␊ |
| 423 | */␊ |
| 424 | ␊ |
| 425 | /*!␊ |
| 426 | \fn bool QDate::operator>=( const QDate &d ) const␊ |
| 427 | Returns TRUE if this date is later than or equal to \a d, otherwise FALSE.␊ |
| 428 | */␊ |
| 429 | ␊ |
| 430 | ␊ |
| 431 | /*!␊ |
| 432 | Returns the current date, as reported by the system clock.␊ |
| 433 | ␊ |
| 434 | \sa QTime::currentTime(), QDateTime::currentDateTime()␊ |
| 435 | */␊ |
| 436 | ␊ |
| 437 | QDate QDate::currentDate()␊ |
| 438 | {␊ |
| 439 | #if defined(_OS_WIN32_)␊ |
| 440 | ␊ |
| 441 | SYSTEMTIME t;␊ |
| 442 | GetLocalTime( &t );␊ |
| 443 | QDate d;␊ |
| 444 | d.jd = greg2jul( t.wYear, t.wMonth, t.wDay );␊ |
| 445 | return d;␊ |
| 446 | ␊ |
| 447 | #else␊ |
| 448 | ␊ |
| 449 | time_t ltime;␊ |
| 450 | time( <ime );␊ |
| 451 | tm *t = localtime( <ime );␊ |
| 452 | QDate d;␊ |
| 453 | d.jd = greg2jul( t->tm_year + 1900, t->tm_mon + 1, t->tm_mday );␊ |
| 454 | return d;␊ |
| 455 | ␊ |
| 456 | #endif␊ |
| 457 | }␊ |
| 458 | ␊ |
| 459 | /*!␊ |
| 460 | Returns TRUE if the specified date (year \a y, month \a m and day \a␊ |
| 461 | d) is valid.␊ |
| 462 | ␊ |
| 463 | Example:␊ |
| 464 | \code␊ |
| 465 | QDate::isValid( 2002, 5, 17 );␉// TRUE; May 17th 2002 is OK.␊ |
| 466 | QDate::isValid( 2002, 2, 30 );␉// FALSE; Feb 30th does not exist␊ |
| 467 | QDate::isValid( 2004, 2, 29 );␉// TRUE; 2004 is a leap year␊ |
| 468 | QDate::isValid( 1202, 6, 6 );␉// FALSE; 1202 is pre-Gregorian␊ |
| 469 | \endcode␊ |
| 470 | ␊ |
| 471 | Note that a \a y value in the range 00-99 is interpreted as␊ |
| 472 | 1900-1999.␊ |
| 473 | ␊ |
| 474 | \sa isNull(), setYMD()␊ |
| 475 | */␊ |
| 476 | ␊ |
| 477 | bool QDate::isValid( int y, int m, int d )␊ |
| 478 | {␊ |
| 479 | if ( y >= 0 && y <= 99 )␊ |
| 480 | ␉y += 1900;␊ |
| 481 | else if ( y < FIRST_YEAR || (y == FIRST_YEAR && (m < 9 ||␊ |
| 482 | ␉␉␉␉␉␉ (m == 9 && d < 14))) )␊ |
| 483 | ␉return FALSE;␊ |
| 484 | return (d > 0 && m > 0 && m <= 12) &&␊ |
| 485 | ␉ (d <= monthDays[m] || (d == 29 && m == 2 && leapYear(y)));␊ |
| 486 | }␊ |
| 487 | ␊ |
| 488 | /*!␊ |
| 489 | Returns TRUE if the specified year \a y is a leap year.␊ |
| 490 | */␊ |
| 491 | ␊ |
| 492 | bool QDate::leapYear( int y )␊ |
| 493 | {␊ |
| 494 | return (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0);␊ |
| 495 | }␊ |
| 496 | ␊ |
| 497 | /*!␊ |
| 498 | \internal␊ |
| 499 | Converts a Gregorian date to a Julian day.␊ |
| 500 | This algorithm is taken from Communications of the ACM, Vol 6, No 8.␊ |
| 501 | \sa jul2greg()␊ |
| 502 | */␊ |
| 503 | ␊ |
| 504 | uint QDate::greg2jul( int y, int m, int d )␊ |
| 505 | {␊ |
| 506 | uint c, ya;␊ |
| 507 | if ( y <= 99 )␊ |
| 508 | ␉y += 1900;␊ |
| 509 | if ( m > 2 ) {␊ |
| 510 | ␉m -= 3;␊ |
| 511 | } else {␊ |
| 512 | ␉m += 9;␊ |
| 513 | ␉y--;␊ |
| 514 | }␊ |
| 515 | c = y;␉␉␉␉␉// NOTE: Sym C++ 6.0 bug␊ |
| 516 | c /= 100;␊ |
| 517 | ya = y - 100*c;␊ |
| 518 | return 1721119 + d + (146097*c)/4 + (1461*ya)/4 + (153*m+2)/5;␊ |
| 519 | }␊ |
| 520 | ␊ |
| 521 | /*!␊ |
| 522 | \internal␊ |
| 523 | Converts a Julian day to a Gregorian date.␊ |
| 524 | This algorithm is taken from Communications of the ACM, Vol 6, No 8.␊ |
| 525 | \sa greg2jul()␊ |
| 526 | */␊ |
| 527 | ␊ |
| 528 | void QDate::jul2greg( uint jd, int &y, int &m, int &d )␊ |
| 529 | {␊ |
| 530 | uint x;␊ |
| 531 | uint j = jd - 1721119;␊ |
| 532 | y = (j*4 - 1)/146097;␊ |
| 533 | j = j*4 - 146097*y - 1;␊ |
| 534 | x = j/4;␊ |
| 535 | j = (x*4 + 3) / 1461;␊ |
| 536 | y = 100*y + j;␊ |
| 537 | x = (x*4) + 3 - 1461*j;␊ |
| 538 | x = (x + 4)/4;␊ |
| 539 | m = (5*x - 3)/153;␊ |
| 540 | x = 5*x - 3 - 153*m;␊ |
| 541 | d = (x + 5)/5;␊ |
| 542 | if ( m < 10 ) {␊ |
| 543 | ␉m += 3;␊ |
| 544 | } else {␊ |
| 545 | ␉m -= 9;␊ |
| 546 | ␉y++;␊ |
| 547 | }␊ |
| 548 | }␊ |
| 549 | ␊ |
| 550 | ␊ |
| 551 | /*****************************************************************************␊ |
| 552 | QTime member functions␊ |
| 553 | *****************************************************************************/␊ |
| 554 | ␊ |
| 555 | /*!␊ |
| 556 | \class QTime qdatetime.h␊ |
| 557 | ␊ |
| 558 | \brief The QTime class provides clock time functions.␊ |
| 559 | ␊ |
| 560 | \ingroup time␊ |
| 561 | ␊ |
| 562 | A QTime object contains a clock time, i.e. a number of hours,␊ |
| 563 | minutes, seconds and milliseconds since midnight. It can read the␊ |
| 564 | current time from the system clock, and measure a span of elapsed␊ |
| 565 | time. It provides functions for comparing times and for manipulating␊ |
| 566 | a time by adding a number of (milli)seconds.␊ |
| 567 | ␊ |
| 568 | QTime operates with 24-hour clock format; it has no concept of␊ |
| 569 | AM/PM. It operates with local time; it does not know anything about␊ |
| 570 | time zones or daylight savings time.␊ |
| 571 | ␊ |
| 572 | A QTime object is typically created either by giving the number of␊ |
| 573 | hours, minutes, seconds, and milliseconds explicitly, or by using␊ |
| 574 | the static function currentTime(), which makes a QTime object which␊ |
| 575 | contains the system's clock time. Note that the accuracy depends on␊ |
| 576 | the accuracy of the underlying operating system; not all systems␊ |
| 577 | provide 1-millisecond accuracy.␊ |
| 578 | ␊ |
| 579 | The hour(), minute(), second(), and msec() functions provide access␊ |
| 580 | to the number of hours, minutes, seconds, and milliseconds of the␊ |
| 581 | time. The same information is provided in textual format by the␊ |
| 582 | toString() function.␊ |
| 583 | ␊ |
| 584 | QTime provides a full set of operators to compare two QTime␊ |
| 585 | objects. A time is considered smaller than another if it is earlier␊ |
| 586 | than the other.␊ |
| 587 | ␊ |
| 588 | The time a given number of seconds or milliseconds later than a␊ |
| 589 | given time can be found using the addSecs() or addMSecs()␊ |
| 590 | functions. Correspondingly, the number of (milli)seconds between two␊ |
| 591 | times can be found using the secsTo() or msecsTo() functions.␊ |
| 592 | ␊ |
| 593 | QTime can be used to measure a span of elapsed time using the␊ |
| 594 | start(), restart(), and elapsed() functions.␊ |
| 595 | ␊ |
| 596 | \sa QDate, QDateTime␊ |
| 597 | */␊ |
| 598 | ␊ |
| 599 | /*!␊ |
| 600 | \fn QTime::QTime()␊ |
| 601 | ␊ |
| 602 | Constructs the time 0 hours, minutes, seconds and milliseconds,␊ |
| 603 | i.e. 00:00:00.000 (midnight). This is a valid time.␊ |
| 604 | ␊ |
| 605 | \sa isValid()␊ |
| 606 | */␊ |
| 607 | ␊ |
| 608 | /*!␊ |
| 609 | Constructs a time with hour \a h, minute \a m, seconds \a s and␊ |
| 610 | milliseconds \a ms.␊ |
| 611 | ␊ |
| 612 | \a h must be in the range 0-23, \a m and \a s must be in the range␊ |
| 613 | 0-59, and \a ms must be in the range 0-999.␊ |
| 614 | ␊ |
| 615 | \sa isValid()␊ |
| 616 | */␊ |
| 617 | ␊ |
| 618 | QTime::QTime( int h, int m, int s, int ms )␊ |
| 619 | {␊ |
| 620 | setHMS( h, m, s, ms );␊ |
| 621 | }␊ |
| 622 | ␊ |
| 623 | ␊ |
| 624 | /*!␊ |
| 625 | \fn bool QTime::isNull() const␊ |
| 626 | Returns TRUE if the time is equal to 00:00:00.000. A null time is valid.␊ |
| 627 | ␊ |
| 628 | \sa isValid()␊ |
| 629 | */␊ |
| 630 | ␊ |
| 631 | /*!␊ |
| 632 | Returns TRUE if the time is valid, or FALSE if the time is invalid.␊ |
| 633 | The time 23:30:55.746 is valid, while 24:12:30 is invalid.␊ |
| 634 | ␊ |
| 635 | \sa isNull()␊ |
| 636 | */␊ |
| 637 | ␊ |
| 638 | bool QTime::isValid() const␊ |
| 639 | {␊ |
| 640 | return ds < MSECS_PER_DAY;␊ |
| 641 | }␊ |
| 642 | ␊ |
| 643 | ␊ |
| 644 | /*!␊ |
| 645 | Returns the hour part (0..23) of the time.␊ |
| 646 | */␊ |
| 647 | ␊ |
| 648 | int QTime::hour() const␊ |
| 649 | {␊ |
| 650 | return ds / MSECS_PER_HOUR;␊ |
| 651 | }␊ |
| 652 | ␊ |
| 653 | /*!␊ |
| 654 | Returns the minute part (0..59) of the time.␊ |
| 655 | */␊ |
| 656 | ␊ |
| 657 | int QTime::minute() const␊ |
| 658 | {␊ |
| 659 | return (ds % MSECS_PER_HOUR)/MSECS_PER_MIN;␊ |
| 660 | }␊ |
| 661 | ␊ |
| 662 | /*!␊ |
| 663 | Returns the second part (0..59) of the time.␊ |
| 664 | */␊ |
| 665 | ␊ |
| 666 | int QTime::second() const␊ |
| 667 | {␊ |
| 668 | return (ds / 1000)%SECS_PER_MIN;␊ |
| 669 | }␊ |
| 670 | ␊ |
| 671 | /*!␊ |
| 672 | Returns the millisecond part (0..999) of the time.␊ |
| 673 | */␊ |
| 674 | ␊ |
| 675 | int QTime::msec() const␊ |
| 676 | {␊ |
| 677 | return ds % 1000;␊ |
| 678 | }␊ |
| 679 | ␊ |
| 680 | ␊ |
| 681 | /*!␊ |
| 682 | Returns the time of this object in a textual format. Milliseconds␊ |
| 683 | are not included. The string format is HH:MM:SS, e.g. 1 second␊ |
| 684 | before midnight would be "23:59:59".␊ |
| 685 | */␊ |
| 686 | ␊ |
| 687 | QString QTime::toString() const␊ |
| 688 | {␊ |
| 689 | QString buf;␊ |
| 690 | buf.sprintf( "%.2d:%.2d:%.2d", hour(), minute(), second() );␊ |
| 691 | return buf;␊ |
| 692 | }␊ |
| 693 | ␊ |
| 694 | ␊ |
| 695 | /*!␊ |
| 696 | Sets the time to hour \a h, minute \a m, seconds \a s and␊ |
| 697 | milliseconds \a ms.␊ |
| 698 | ␊ |
| 699 | \a h must be in the range 0-23, \a m and \a s must be in the range␊ |
| 700 | 0-59, and \a ms must be in the range 0-999. Returns TRUE if the set␊ |
| 701 | time is valid, otherwise FALSE.␊ |
| 702 | ␊ |
| 703 | \sa isValid()␊ |
| 704 | */␊ |
| 705 | ␊ |
| 706 | bool QTime::setHMS( int h, int m, int s, int ms )␊ |
| 707 | {␊ |
| 708 | if ( !isValid(h,m,s,ms) ) {␊ |
| 709 | #if defined(CHECK_RANGE)␊ |
| 710 | ␉qWarning( "QTime::setHMS Invalid time %02d:%02d:%02d.%03d", h, m, s,␊ |
| 711 | ␉␉ ms );␊ |
| 712 | #endif␊ |
| 713 | ␉ds = MSECS_PER_DAY;␉␉// make this invalid␊ |
| 714 | ␉return FALSE;␊ |
| 715 | }␊ |
| 716 | ds = (h*SECS_PER_HOUR + m*SECS_PER_MIN + s)*1000 + ms;␊ |
| 717 | return TRUE;␊ |
| 718 | }␊ |
| 719 | ␊ |
| 720 | /*!␊ |
| 721 | Returns a QTime object containing a time \a nsecs seconds later than␊ |
| 722 | the time of this object (or earlier if \a ms is negative).␊ |
| 723 | ␊ |
| 724 | Note that the time will wrap if it passes midnight.␊ |
| 725 | ␊ |
| 726 | Example:␊ |
| 727 | \code␊ |
| 728 | QTime n( 14, 0, 0 ); // n == 14:00:00␊ |
| 729 | QTime t;␊ |
| 730 | t = n.addSecs( 70 ); // t == 14:01:10␊ |
| 731 | t = n.addSecs( -70 ); // t == 13:58:50␊ |
| 732 | t = n.addSecs( 10*60*60 + 5 ); // t == 00:00:05␊ |
| 733 | t = n.addSecs( -15*60*60 ); // t == 23:00:00␊ |
| 734 | \endcode␊ |
| 735 | ␊ |
| 736 | \sa addMSecs(), secsTo(), QDateTime::addSecs()␊ |
| 737 | */␊ |
| 738 | ␊ |
| 739 | QTime QTime::addSecs( int nsecs ) const␊ |
| 740 | {␊ |
| 741 | return addMSecs(nsecs*1000);␊ |
| 742 | }␊ |
| 743 | ␊ |
| 744 | /*!␊ |
| 745 | Returns the number of seconds from this time to \a t (which is␊ |
| 746 | negative if \a t is earlier than this time).␊ |
| 747 | ␊ |
| 748 | Since QTime measures time within a day and there are 86400 seconds␊ |
| 749 | in a day, the result is between -86400 and 86400.␊ |
| 750 | ␊ |
| 751 | \sa addSecs() QDateTime::secsTo()␊ |
| 752 | */␊ |
| 753 | ␊ |
| 754 | int QTime::secsTo( const QTime &t ) const␊ |
| 755 | {␊ |
| 756 | return ((int)t.ds - (int)ds)/1000;␊ |
| 757 | }␊ |
| 758 | ␊ |
| 759 | /*!␊ |
| 760 | Returns a QTime object containing a time \a ms milliseconds later than␊ |
| 761 | the time of this object (or earlier if \a ms is negative).␊ |
| 762 | ␊ |
| 763 | Note that the time will wrap if it passes midnight. See addSecs()␊ |
| 764 | for an example.␊ |
| 765 | ␊ |
| 766 | \sa addSecs(), msecsTo()␊ |
| 767 | */␊ |
| 768 | ␊ |
| 769 | QTime QTime::addMSecs( int ms ) const␊ |
| 770 | {␊ |
| 771 | QTime t;␊ |
| 772 | if ( ms < 0 ) {␊ |
| 773 | ␉// % not well-defined for -ve, but / is.␊ |
| 774 | ␉int negdays = (MSECS_PER_DAY-ms) / MSECS_PER_DAY;␊ |
| 775 | ␉t.ds = ((int)ds + ms + negdays*MSECS_PER_DAY)␊ |
| 776 | ␉␉% MSECS_PER_DAY;␊ |
| 777 | } else {␊ |
| 778 | ␉t.ds = ((int)ds + ms) % MSECS_PER_DAY;␊ |
| 779 | }␊ |
| 780 | return t;␊ |
| 781 | }␊ |
| 782 | ␊ |
| 783 | /*!␊ |
| 784 | Returns the number of milliseconds from this time to \a t (which is␊ |
| 785 | negative if \a t is earlier than this time).␊ |
| 786 | ␊ |
| 787 | Since QTime measures time within a day and there are 86400000␊ |
| 788 | milliseconds in a day, the result is between -86400000 and 86400000.␊ |
| 789 | ␊ |
| 790 | \sa secsTo()␊ |
| 791 | */␊ |
| 792 | ␊ |
| 793 | int QTime::msecsTo( const QTime &t ) const␊ |
| 794 | {␊ |
| 795 | return (int)t.ds - (int)ds;␊ |
| 796 | }␊ |
| 797 | ␊ |
| 798 | ␊ |
| 799 | /*!␊ |
| 800 | \fn bool QTime::operator==( const QTime &t ) const␊ |
| 801 | ␊ |
| 802 | Returns TRUE if this time is equal to \a t, or FALSE if they are␊ |
| 803 | different.␊ |
| 804 | */␊ |
| 805 | ␊ |
| 806 | /*!␊ |
| 807 | \fn bool QTime::operator!=( const QTime &t ) const␊ |
| 808 | ␊ |
| 809 | Returns TRUE if this time is different from \a t, or FALSE if they␊ |
| 810 | are equal.␊ |
| 811 | */␊ |
| 812 | ␊ |
| 813 | /*!␊ |
| 814 | \fn bool QTime::operator<( const QTime &t ) const␊ |
| 815 | ␊ |
| 816 | Returns TRUE if this time is earlier than \a t, otherwise FALSE.␊ |
| 817 | */␊ |
| 818 | ␊ |
| 819 | /*!␊ |
| 820 | \fn bool QTime::operator<=( const QTime &t ) const␊ |
| 821 | ␊ |
| 822 | Returns TRUE if this time is earlier than or equal to \a t,␊ |
| 823 | otherwise FALSE.␊ |
| 824 | */␊ |
| 825 | ␊ |
| 826 | /*!␊ |
| 827 | \fn bool QTime::operator>( const QTime &t ) const␊ |
| 828 | ␊ |
| 829 | Returns TRUE if this time is later than \a t, otherwise FALSE.␊ |
| 830 | */␊ |
| 831 | ␊ |
| 832 | /*!␊ |
| 833 | \fn bool QTime::operator>=( const QTime &t ) const␊ |
| 834 | ␊ |
| 835 | Returns TRUE if this time is later than or equal to \a t, otherwise␊ |
| 836 | FALSE.␊ |
| 837 | */␊ |
| 838 | ␊ |
| 839 | ␊ |
| 840 | ␊ |
| 841 | /*!␊ |
| 842 | Returns the current time, as reported by the system clock.␊ |
| 843 | ␊ |
| 844 | Note that the accuracy depends on the accuracy of the underlying␊ |
| 845 | operating system; not all systems provide 1-millisecond accuracy.␊ |
| 846 | */␊ |
| 847 | ␊ |
| 848 | QTime QTime::currentTime()␊ |
| 849 | {␊ |
| 850 | QTime ct;␊ |
| 851 | currentTime( &ct );␊ |
| 852 | return ct;␊ |
| 853 | }␊ |
| 854 | ␊ |
| 855 | /*!␊ |
| 856 | \internal␊ |
| 857 | ␊ |
| 858 | Fetches the current time and returns TRUE if the time is within one␊ |
| 859 | minute after midnight, otherwise FALSE. The return value is used by␊ |
| 860 | QDateTime::currentDateTime() to ensure that the date there is correct.␊ |
| 861 | */␊ |
| 862 | ␊ |
| 863 | bool QTime::currentTime( QTime *ct )␊ |
| 864 | {␊ |
| 865 | if ( !ct ) {␊ |
| 866 | #if defined(CHECK_NULL)␊ |
| 867 | ␉qWarning( "QTime::currentTime(QTime *): Null pointer not allowed" );␊ |
| 868 | #endif␊ |
| 869 | ␉return FALSE;␊ |
| 870 | }␊ |
| 871 | ␊ |
| 872 | #if defined(_OS_WIN32_)␊ |
| 873 | ␊ |
| 874 | SYSTEMTIME t;␊ |
| 875 | GetLocalTime( &t );␊ |
| 876 | ct->ds = MSECS_PER_HOUR*t.wHour + MSECS_PER_MIN*t.wMinute +␊ |
| 877 | ␉ 1000*t.wSecond + t.wMilliseconds;␊ |
| 878 | return (t.wHour == 0 && t.wMinute == 0);␊ |
| 879 | ␊ |
| 880 | #elif defined(_OS_OS2_)␊ |
| 881 | ␊ |
| 882 | DATETIME t;␊ |
| 883 | DosGetDateTime( &t );␊ |
| 884 | ct->ds = MSECS_PER_HOUR*t.hours + MSECS_PER_MIN*t.minutes +␊ |
| 885 | ␉ 1000*t.seconds + 10*t.hundredths;␊ |
| 886 | return (t.hours == 0 && t.minutes == 0);␊ |
| 887 | ␊ |
| 888 | #elif defined(_OS_MSDOS_)␊ |
| 889 | ␊ |
| 890 | _dostime_t t;␊ |
| 891 | _dos_gettime( &t );␊ |
| 892 | ct->ds = MSECS_PER_HOUR*t.hour + MSECS_PER_MIN*t.minute +␊ |
| 893 | ␉ t.second*1000 + t.hsecond*10;␊ |
| 894 | return (t.hour== 0 && t.minute == 0);␊ |
| 895 | ␊ |
| 896 | #elif defined(_OS_UNIX_)␊ |
| 897 | ␊ |
| 898 | struct timeval tv;␊ |
| 899 | gettimeofday( &tv, 0 );␊ |
| 900 | time_t ltime = tv.tv_sec;␊ |
| 901 | tm *t = localtime( <ime );␊ |
| 902 | ct->ds = (uint)( MSECS_PER_HOUR*t->tm_hour + MSECS_PER_MIN*t->tm_min +␊ |
| 903 | ␉␉ 1000*t->tm_sec + tv.tv_usec/1000 );␊ |
| 904 | return (t->tm_hour== 0 && t->tm_min == 0);␊ |
| 905 | ␊ |
| 906 | #else␊ |
| 907 | ␊ |
| 908 | time_t ltime;␉␉␉// no millisecond resolution!!␊ |
| 909 | ::time( <ime );␊ |
| 910 | tm *t = localtime( <ime );␊ |
| 911 | ct->ds = MSECS_PER_HOUR*t->tm_hour + MSECS_PER_MIN*t->tm_min +␊ |
| 912 | ␉ 1000*t->tm_sec;␊ |
| 913 | return (t->tm_hour== 0 && t->tm_min == 0);␊ |
| 914 | #endif␊ |
| 915 | }␊ |
| 916 | ␊ |
| 917 | /*!␊ |
| 918 | Returns TRUE if the specified time is valid, otherwise FALSE.␊ |
| 919 | ␊ |
| 920 | The time is valid if \a h is in the range 0-23, \a m and \a s are in␊ |
| 921 | the range 0-59, and \a ms is in the range 0-999.␊ |
| 922 | ␊ |
| 923 | Example:␊ |
| 924 | \code␊ |
| 925 | QTime::isValid(21, 10, 30);␉␉// returns TRUE␊ |
| 926 | QTime::isValid(22, 5, 62);␉␉// returns FALSE␊ |
| 927 | \endcode␊ |
| 928 | */␊ |
| 929 | ␊ |
| 930 | bool QTime::isValid( int h, int m, int s, int ms )␊ |
| 931 | {␊ |
| 932 | return (uint)h < 24 && (uint)m < 60 && (uint)s < 60 && (uint)ms < 1000;␊ |
| 933 | }␊ |
| 934 | ␊ |
| 935 | ␊ |
| 936 | /*!␊ |
| 937 | Sets this time to the current time. This is practical for timing:␊ |
| 938 | ␊ |
| 939 | \code␊ |
| 940 | QTime t;␊ |
| 941 | t.start();␉␉␉␉// start clock␊ |
| 942 | ... // some lengthy task␊ |
| 943 | qDebug( "%d\n", t.elapsed() );␉// prints # msecs elapsed␊ |
| 944 | \endcode␊ |
| 945 | ␊ |
| 946 | \sa restart(), elapsed(), currentTime()␊ |
| 947 | */␊ |
| 948 | ␊ |
| 949 | void QTime::start()␊ |
| 950 | {␊ |
| 951 | *this = currentTime();␊ |
| 952 | }␊ |
| 953 | ␊ |
| 954 | /*!␊ |
| 955 | Sets this time to the current time, and returns the number of␊ |
| 956 | milliseconds that have elapsed since the last time start() or␊ |
| 957 | restart() was called.␊ |
| 958 | ␊ |
| 959 | This function is guaranteed to be atomic, and is thus very handy for␊ |
| 960 | repeated measurements: call start() to start the first measurement,␊ |
| 961 | then restart() for each later measurement.␊ |
| 962 | ␊ |
| 963 | Note that the counter wraps to zero 24 hours after the last call to␊ |
| 964 | start() or restart().␊ |
| 965 | ␊ |
| 966 | \warning If the system's clock setting has been changed since the␊ |
| 967 | last time start() or restart() was called, the result is undefined.␊ |
| 968 | This can happen e.g. when daylight saving is turned on or off.␊ |
| 969 | ␊ |
| 970 | \sa start(), elapsed(), currentTime()␊ |
| 971 | */␊ |
| 972 | ␊ |
| 973 | int QTime::restart()␊ |
| 974 | {␊ |
| 975 | QTime t = currentTime();␊ |
| 976 | int n = msecsTo( t );␊ |
| 977 | if ( n < 0 )␉␉␉␉// passed midnight␊ |
| 978 | ␉n += 86400*1000;␊ |
| 979 | *this = t;␊ |
| 980 | return n;␊ |
| 981 | }␊ |
| 982 | ␊ |
| 983 | /*!␊ |
| 984 | Returns the number of milliseconds that have elapsed since the last␊ |
| 985 | time start() or restart() was called.␊ |
| 986 | ␊ |
| 987 | Note that the counter wraps to zero 24 hours after the last call to␊ |
| 988 | start() or restart.␊ |
| 989 | ␊ |
| 990 | Note that the accuracy depends on the accuracy of the underlying␊ |
| 991 | operating system; not all systems provide 1-millisecond accuracy.␊ |
| 992 | ␊ |
| 993 | \warning If the system's clock setting has been changed since the␊ |
| 994 | last time start() or restart() was called, the result is undefined.␊ |
| 995 | This can happen e.g. when daylight saving is turned on or off.␊ |
| 996 | ␊ |
| 997 | \sa start(), restart()␊ |
| 998 | */␊ |
| 999 | ␊ |
| 1000 | int QTime::elapsed()␊ |
| 1001 | {␊ |
| 1002 | int n = msecsTo( currentTime() );␊ |
| 1003 | if ( n < 0 )␉␉␉␉// passed midnight␊ |
| 1004 | ␉n += 86400*1000;␊ |
| 1005 | return n;␊ |
| 1006 | }␊ |
| 1007 | ␊ |
| 1008 | ␊ |
| 1009 | /*****************************************************************************␊ |
| 1010 | QDateTime member functions␊ |
| 1011 | *****************************************************************************/␊ |
| 1012 | ␊ |
| 1013 | /*!␊ |
| 1014 | \class QDateTime qdatetime.h␊ |
| 1015 | \brief The QDateTime class provides date and time functions.␊ |
| 1016 | ␊ |
| 1017 | \ingroup time␊ |
| 1018 | ␊ |
| 1019 | A QDateTime object contains a calendar date and a clock time (a␊ |
| 1020 | "datetime"). It is a combination of the QDate and QTime classes. It␊ |
| 1021 | can read the current datetime from the system clock. It provides␊ |
| 1022 | functions for comparing datetimes and for manipulating a datetime by␊ |
| 1023 | adding a number of seconds or days.␊ |
| 1024 | ␊ |
| 1025 | A QDateTime object is typically created either by giving a date and␊ |
| 1026 | time explicitly, or by using the static function currentTime(),␊ |
| 1027 | which makes a QDateTime object which contains the system's clock␊ |
| 1028 | time.␊ |
| 1029 | ␊ |
| 1030 | The date() and time() functions provide access to the date and time␊ |
| 1031 | parts of the datetime. The same information is provided in textual␊ |
| 1032 | format by the toString() function.␊ |
| 1033 | ␊ |
| 1034 | QDateTime provides a full set of operators to compare two QDateTime␊ |
| 1035 | objects. A datetime is considered smaller than another if it is␊ |
| 1036 | earlier than the other.␊ |
| 1037 | ␊ |
| 1038 | The datetime a given number of days or seconds later than a given␊ |
| 1039 | datetime can be found using the addDays() and addSecs()␊ |
| 1040 | functions. Correspondingly, the number of days or seconds between␊ |
| 1041 | two times can be found using the daysTo() or secsTo() functions.␊ |
| 1042 | ␊ |
| 1043 | A datetime can also be set using the setTime_t() function, which␊ |
| 1044 | takes a POSIX-standard "number of seconds since 00:00:00 on January␊ |
| 1045 | 1, 1970" value.␊ |
| 1046 | ␊ |
| 1047 | The limitations regarding range and resolution mentioned in the␊ |
| 1048 | QDate and QTime documentation apply for QDateTime also.␊ |
| 1049 | ␊ |
| 1050 | \sa QDate, QTime␊ |
| 1051 | */␊ |
| 1052 | ␊ |
| 1053 | ␊ |
| 1054 | /*!␊ |
| 1055 | \fn QDateTime::QDateTime()␊ |
| 1056 | ␊ |
| 1057 | Constructs a null datetime (i.e. null date and null time). A null␊ |
| 1058 | datetime is invalid, since the date is invalid.␊ |
| 1059 | ␊ |
| 1060 | \sa isValid()␊ |
| 1061 | */␊ |
| 1062 | ␊ |
| 1063 | ␊ |
| 1064 | /*!␊ |
| 1065 | Constructs a datetime with date \a date and null time (00:00:00.000).␊ |
| 1066 | */␊ |
| 1067 | ␊ |
| 1068 | QDateTime::QDateTime( const QDate &date )␊ |
| 1069 | : d(date)␊ |
| 1070 | {␊ |
| 1071 | }␊ |
| 1072 | ␊ |
| 1073 | /*!␊ |
| 1074 | Constructs a datetime with date \a date and time \a time.␊ |
| 1075 | */␊ |
| 1076 | ␊ |
| 1077 | QDateTime::QDateTime( const QDate &date, const QTime &time )␊ |
| 1078 | : d(date), t(time)␊ |
| 1079 | {␊ |
| 1080 | }␊ |
| 1081 | ␊ |
| 1082 | ␊ |
| 1083 | /*!␊ |
| 1084 | \fn bool QDateTime::isNull() const␊ |
| 1085 | ␊ |
| 1086 | Returns TRUE if both the date and the time are null.␉A null date is invalid.␊ |
| 1087 | ␊ |
| 1088 | \sa QDate::isNull(), QTime::isNull()␊ |
| 1089 | */␊ |
| 1090 | ␊ |
| 1091 | /*!␊ |
| 1092 | \fn bool QDateTime::isValid() const␊ |
| 1093 | ␊ |
| 1094 | Returns TRUE if both the date and the time are valid.␊ |
| 1095 | ␊ |
| 1096 | \sa QDate::isValid(), QTime::isValid()␊ |
| 1097 | */␊ |
| 1098 | ␊ |
| 1099 | /*!␊ |
| 1100 | \fn QDate QDateTime::date() const␊ |
| 1101 | ␊ |
| 1102 | Returns the date part of this datetime.␊ |
| 1103 | ␊ |
| 1104 | \sa setDate(), time()␊ |
| 1105 | */␊ |
| 1106 | ␊ |
| 1107 | /*!␊ |
| 1108 | \fn QTime QDateTime::time() const␊ |
| 1109 | ␊ |
| 1110 | Returns the time part of this datetime.␊ |
| 1111 | ␊ |
| 1112 | \sa setTime(), date()␊ |
| 1113 | */␊ |
| 1114 | ␊ |
| 1115 | /*!␊ |
| 1116 | \fn void QDateTime::setDate( const QDate &date )␊ |
| 1117 | ␊ |
| 1118 | Sets the date part of this datetime.␊ |
| 1119 | ␊ |
| 1120 | \sa date(), setTime()␊ |
| 1121 | */␊ |
| 1122 | ␊ |
| 1123 | /*!␊ |
| 1124 | \fn void QDateTime::setTime( const QTime &time )␊ |
| 1125 | ␊ |
| 1126 | Sets the time part of this datetime.␊ |
| 1127 | ␊ |
| 1128 | \sa time(), setDate()␊ |
| 1129 | */␊ |
| 1130 | ␊ |
| 1131 | ␊ |
| 1132 | /*!␊ |
| 1133 | Sets the local date and time given the number of seconds that have passed␊ |
| 1134 | since 00:00:00 on January 1, 1970, Coordinated Universal Time (UTC).␊ |
| 1135 | On systems that do not support timezones this function will behave as if␊ |
| 1136 | local time were UTC.␊ |
| 1137 | ␊ |
| 1138 | Note that Microsoft Windows supports only a limited range of values for␊ |
| 1139 | \a secsSince1Jan1970UTC.␊ |
| 1140 | */␊ |
| 1141 | ␊ |
| 1142 | void QDateTime::setTime_t( uint secsSince1Jan1970UTC )␊ |
| 1143 | {␊ |
| 1144 | time_t tmp = (time_t) secsSince1Jan1970UTC;␊ |
| 1145 | tm *tM = localtime( &tmp );␊ |
| 1146 | if ( !tM ) {␊ |
| 1147 | ␉tM = gmtime( &tmp );␊ |
| 1148 | ␉if ( !tM ) {␊ |
| 1149 | ␉ d.jd = QDate::greg2jul( 1970, 1, 1 );␊ |
| 1150 | ␉ t.ds = 0;␊ |
| 1151 | ␉ return;␊ |
| 1152 | ␉}␊ |
| 1153 | }␊ |
| 1154 | d.jd = QDate::greg2jul( tM->tm_year + 1900, tM->tm_mon + 1, tM->tm_mday );␊ |
| 1155 | t.ds = MSECS_PER_HOUR*tM->tm_hour + MSECS_PER_MIN*tM->tm_min +␊ |
| 1156 | ␉ 1000*tM->tm_sec;␊ |
| 1157 | }␊ |
| 1158 | ␊ |
| 1159 | ␊ |
| 1160 | /*!␊ |
| 1161 | Returns the datetime as a string.␊ |
| 1162 | ␊ |
| 1163 | The string format is "Sat May 20 03:40:13 1998".␊ |
| 1164 | ␊ |
| 1165 | This function uses QDate::dayName(), QDate::monthName(), and␊ |
| 1166 | QTime::toString() to generate the string.␊ |
| 1167 | ␊ |
| 1168 | */␊ |
| 1169 | ␊ |
| 1170 | QString QDateTime::toString() const␊ |
| 1171 | {␊ |
| 1172 | QString buf = d.dayName(d.dayOfWeek());␊ |
| 1173 | buf += ' ';␊ |
| 1174 | buf += d.monthName(d.month());␊ |
| 1175 | buf += ' ';␊ |
| 1176 | buf += QString().setNum(d.day());␊ |
| 1177 | buf += ' ';␊ |
| 1178 | buf += t.toString();␊ |
| 1179 | buf += ' ';␊ |
| 1180 | buf += QString().setNum(d.year());␊ |
| 1181 | return buf;␊ |
| 1182 | }␊ |
| 1183 | ␊ |
| 1184 | /*!␊ |
| 1185 | Returns a QDateTime object containing a datetime \a ndays days later␊ |
| 1186 | than the datetime of this object (or earlier if \a ndays is␊ |
| 1187 | negative).␊ |
| 1188 | ␊ |
| 1189 | \sa daysTo(), addSecs()␊ |
| 1190 | */␊ |
| 1191 | ␊ |
| 1192 | QDateTime QDateTime::addDays( int ndays ) const␊ |
| 1193 | {␊ |
| 1194 | return QDateTime( d.addDays(ndays), t );␊ |
| 1195 | }␊ |
| 1196 | ␊ |
| 1197 | /*!␊ |
| 1198 | Returns a QDateTime object containing a datetime \a nsecs seconds␊ |
| 1199 | later than the datetime of this object (or earlier if \a nsecs is␊ |
| 1200 | negative).␊ |
| 1201 | ␊ |
| 1202 | \sa secsTo(), addDays()␊ |
| 1203 | */␊ |
| 1204 | ␊ |
| 1205 | QDateTime QDateTime::addSecs( int nsecs ) const␊ |
| 1206 | {␊ |
| 1207 | uint dd = d.jd;␊ |
| 1208 | int tt = t.ds;␊ |
| 1209 | int sign = 1;␊ |
| 1210 | if ( nsecs < 0 ) {␊ |
| 1211 | ␉nsecs = -nsecs;␊ |
| 1212 | ␉sign = -1;␊ |
| 1213 | }␊ |
| 1214 | if ( nsecs >= (int)SECS_PER_DAY ) {␊ |
| 1215 | ␉dd += sign*(nsecs/SECS_PER_DAY);␊ |
| 1216 | ␉nsecs %= SECS_PER_DAY;␊ |
| 1217 | }␊ |
| 1218 | tt += sign*nsecs*1000;␊ |
| 1219 | if ( tt < 0 ) {␊ |
| 1220 | ␉tt = MSECS_PER_DAY - tt - 1;␊ |
| 1221 | ␉dd -= tt / MSECS_PER_DAY;␊ |
| 1222 | ␉tt = tt % MSECS_PER_DAY;␊ |
| 1223 | ␉tt = MSECS_PER_DAY - tt - 1;␊ |
| 1224 | } else if ( tt >= (int)MSECS_PER_DAY ) {␊ |
| 1225 | ␉dd += ( tt / MSECS_PER_DAY );␊ |
| 1226 | ␉tt = tt % MSECS_PER_DAY;␊ |
| 1227 | }␊ |
| 1228 | QDateTime ret;␊ |
| 1229 | ret.t.ds = tt;␊ |
| 1230 | ret.d.jd = dd;␊ |
| 1231 | return ret;␊ |
| 1232 | }␊ |
| 1233 | ␊ |
| 1234 | /*!␊ |
| 1235 | Returns the number of days from this datetime to \a dt (which is␊ |
| 1236 | negative if \a dt is earlier than this datetime).␊ |
| 1237 | ␊ |
| 1238 | \sa addDays(), secsTo()␊ |
| 1239 | */␊ |
| 1240 | ␊ |
| 1241 | int QDateTime::daysTo( const QDateTime &dt ) const␊ |
| 1242 | {␊ |
| 1243 | return d.daysTo( dt.d );␊ |
| 1244 | }␊ |
| 1245 | ␊ |
| 1246 | /*!␊ |
| 1247 | Returns the number of seconds from this datetime to \a dt (which is␊ |
| 1248 | negative if \a dt is earlier than this datetime).␊ |
| 1249 | ␊ |
| 1250 | Example:␊ |
| 1251 | \code␊ |
| 1252 | QDateTime dt = QDateTime::currentDateTime();␊ |
| 1253 | QDateTime x( QDate(dt.year(),12,24), QTime(17,00) );␊ |
| 1254 | qDebug( "There are %d seconds to Christmas", dt.secsTo(x) );␊ |
| 1255 | \endcode␊ |
| 1256 | ␊ |
| 1257 | \sa addSecs(), daysTo(), QTime::secsTo()␊ |
| 1258 | */␊ |
| 1259 | ␊ |
| 1260 | int QDateTime::secsTo( const QDateTime &dt ) const␊ |
| 1261 | {␊ |
| 1262 | return t.secsTo(dt.t) + d.daysTo(dt.d)*SECS_PER_DAY;␊ |
| 1263 | }␊ |
| 1264 | ␊ |
| 1265 | ␊ |
| 1266 | /*!␊ |
| 1267 | Returns TRUE if this datetime is equal to \a dt, or FALSE if␊ |
| 1268 | they are different.␊ |
| 1269 | \sa operator!=()␊ |
| 1270 | */␊ |
| 1271 | ␊ |
| 1272 | bool QDateTime::operator==( const QDateTime &dt ) const␊ |
| 1273 | {␊ |
| 1274 | return t == dt.t && d == dt.d;␊ |
| 1275 | }␊ |
| 1276 | ␊ |
| 1277 | /*!␊ |
| 1278 | Returns TRUE if this datetime is different from \a dt, or FALSE if␊ |
| 1279 | they are equal.␊ |
| 1280 | \sa operator==()␊ |
| 1281 | */␊ |
| 1282 | ␊ |
| 1283 | bool QDateTime::operator!=( const QDateTime &dt ) const␊ |
| 1284 | {␊ |
| 1285 | return t != dt.t || d != dt.d;␊ |
| 1286 | }␊ |
| 1287 | ␊ |
| 1288 | /*!␊ |
| 1289 | Returns TRUE if this datetime is earlier than \a dt, otherwise FALSE.␊ |
| 1290 | */␊ |
| 1291 | ␊ |
| 1292 | bool QDateTime::operator<( const QDateTime &dt ) const␊ |
| 1293 | {␊ |
| 1294 | if ( d < dt.d )␊ |
| 1295 | ␉return TRUE;␊ |
| 1296 | return d == dt.d ? t < dt.t : FALSE;␊ |
| 1297 | }␊ |
| 1298 | ␊ |
| 1299 | /*!␊ |
| 1300 | Returns TRUE if this datetime is earlier than or equal to \a dt,␊ |
| 1301 | otherwise FALSE.␊ |
| 1302 | */␊ |
| 1303 | ␊ |
| 1304 | bool QDateTime::operator<=( const QDateTime &dt ) const␊ |
| 1305 | {␊ |
| 1306 | if ( d < dt.d )␊ |
| 1307 | ␉return TRUE;␊ |
| 1308 | return d == dt.d ? t <= dt.t : FALSE;␊ |
| 1309 | }␊ |
| 1310 | ␊ |
| 1311 | /*!␊ |
| 1312 | Returns TRUE if this datetime is later than \a dt, otherwise FALSE.␊ |
| 1313 | */␊ |
| 1314 | ␊ |
| 1315 | bool QDateTime::operator>( const QDateTime &dt ) const␊ |
| 1316 | {␊ |
| 1317 | if ( d > dt.d )␊ |
| 1318 | ␉return TRUE;␊ |
| 1319 | return d == dt.d ? t > dt.t : FALSE;␊ |
| 1320 | }␊ |
| 1321 | ␊ |
| 1322 | /*!␊ |
| 1323 | Returns TRUE if this datetime is later than or equal to \a dt,␊ |
| 1324 | otherwise FALSE.␊ |
| 1325 | */␊ |
| 1326 | ␊ |
| 1327 | bool QDateTime::operator>=( const QDateTime &dt ) const␊ |
| 1328 | {␊ |
| 1329 | if ( d > dt.d )␊ |
| 1330 | ␉return TRUE;␊ |
| 1331 | return d == dt.d ? t >= dt.t : FALSE;␊ |
| 1332 | }␊ |
| 1333 | ␊ |
| 1334 | /*!␊ |
| 1335 | Returns the current datetime, as reported by the system clock.␊ |
| 1336 | ␊ |
| 1337 | \sa QDate::currentDate(), QTime::currentTime()␊ |
| 1338 | */␊ |
| 1339 | ␊ |
| 1340 | QDateTime QDateTime::currentDateTime()␊ |
| 1341 | {␊ |
| 1342 | QDate cd = QDate::currentDate();␊ |
| 1343 | QTime ct;␊ |
| 1344 | if ( QTime::currentTime(&ct) )␉␉// too close to midnight?␊ |
| 1345 | ␉cd = QDate::currentDate();␉␉// YES! time for some midnight␊ |
| 1346 | ␉␉␉␉␉␉// voodoo, fetch date again␊ |
| 1347 | return QDateTime( cd, ct );␊ |
| 1348 | }␊ |
| 1349 | ␊ |
| 1350 | ␊ |
| 1351 | /*****************************************************************************␊ |
| 1352 | Date/time stream functions␊ |
| 1353 | *****************************************************************************/␊ |
| 1354 | ␊ |
| 1355 | #ifndef QT_NO_DATASTREAM␊ |
| 1356 | /*!␊ |
| 1357 | \relates QDate␊ |
| 1358 | Writes the date to the stream.␊ |
| 1359 | ␊ |
| 1360 | \sa \link datastreamformat.html Format of the QDataStream operators \endlink␊ |
| 1361 | */␊ |
| 1362 | ␊ |
| 1363 | QDataStream &operator<<( QDataStream &s, const QDate &d )␊ |
| 1364 | {␊ |
| 1365 | return s << (Q_UINT32)(d.jd);␊ |
| 1366 | }␊ |
| 1367 | ␊ |
| 1368 | /*!␊ |
| 1369 | \relates QDate␊ |
| 1370 | Reads a date from the stream.␊ |
| 1371 | ␊ |
| 1372 | \sa \link datastreamformat.html Format of the QDataStream operators \endlink␊ |
| 1373 | */␊ |
| 1374 | ␊ |
| 1375 | QDataStream &operator>>( QDataStream &s, QDate &d )␊ |
| 1376 | {␊ |
| 1377 | Q_UINT32 jd;␊ |
| 1378 | s >> jd;␊ |
| 1379 | d.jd = jd;␊ |
| 1380 | return s;␊ |
| 1381 | }␊ |
| 1382 | ␊ |
| 1383 | /*!␊ |
| 1384 | \relates QTime␊ |
| 1385 | Writes a time to the stream.␊ |
| 1386 | ␊ |
| 1387 | \sa \link datastreamformat.html Format of the QDataStream operators \endlink␊ |
| 1388 | */␊ |
| 1389 | ␊ |
| 1390 | QDataStream &operator<<( QDataStream &s, const QTime &t )␊ |
| 1391 | {␊ |
| 1392 | return s << (Q_UINT32)(t.ds);␊ |
| 1393 | }␊ |
| 1394 | ␊ |
| 1395 | /*!␊ |
| 1396 | \relates QTime␊ |
| 1397 | Reads a time from the stream.␊ |
| 1398 | ␊ |
| 1399 | \sa \link datastreamformat.html Format of the QDataStream operators \endlink␊ |
| 1400 | */␊ |
| 1401 | ␊ |
| 1402 | QDataStream &operator>>( QDataStream &s, QTime &t )␊ |
| 1403 | {␊ |
| 1404 | Q_UINT32 ds;␊ |
| 1405 | s >> ds;␊ |
| 1406 | t.ds = ds;␊ |
| 1407 | return s;␊ |
| 1408 | }␊ |
| 1409 | ␊ |
| 1410 | /*!␊ |
| 1411 | \relates QDateTime␊ |
| 1412 | Writes a datetime to the stream.␊ |
| 1413 | ␊ |
| 1414 | \sa \link datastreamformat.html Format of the QDataStream operators \endlink␊ |
| 1415 | */␊ |
| 1416 | ␊ |
| 1417 | QDataStream &operator<<( QDataStream &s, const QDateTime &dt )␊ |
| 1418 | {␊ |
| 1419 | return s << dt.d << dt.t;␊ |
| 1420 | }␊ |
| 1421 | ␊ |
| 1422 | /*!␊ |
| 1423 | \relates QDateTime␊ |
| 1424 | Reads a datetime from the stream.␊ |
| 1425 | ␊ |
| 1426 | \sa \link datastreamformat.html Format of the QDataStream operators \endlink␊ |
| 1427 | */␊ |
| 1428 | ␊ |
| 1429 | QDataStream &operator>>( QDataStream &s, QDateTime &dt )␊ |
| 1430 | {␊ |
| 1431 | s >> dt.d >> dt.t;␊ |
| 1432 | return s;␊ |
| 1433 | }␊ |
| 1434 | #endif //QT_NO_DATASTREAM␊ |
| 1435 | |
