third_party/WebKit/Source/wtf/DateMath.h

   1 /*
   2  * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
   4  * Copyright (C) 2009 Google Inc. All rights reserved.
   5  * Copyright (C) 2010 Research In Motion Limited. All rights reserved.
   6  *
   7  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   8  *
   9  * The contents of this file are subject to the Mozilla Public License Version
  10  * 1.1 (the "License"); you may not use this file except in compliance with
  11  * the License. You may obtain a copy of the License at
  12  * http://www.mozilla.org/MPL/
  13  *
  14  * Software distributed under the License is distributed on an "AS IS" basis,
  15  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  16  * for the specific language governing rights and limitations under the
  17  * License.
  18  *
  19  * The Original Code is Mozilla Communicator client code, released
  20  * March 31, 1998.
  21  *
  22  * The Initial Developer of the Original Code is
  23  * Netscape Communications Corporation.
  24  * Portions created by the Initial Developer are Copyright (C) 1998
  25  * the Initial Developer. All Rights Reserved.
  26  *
  27  * Contributor(s):
  28  *
  29  * Alternatively, the contents of this file may be used under the terms of
  30  * either of the GNU General Public License Version 2 or later (the "GPL"),
  31  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  32  * in which case the provisions of the GPL or the LGPL are applicable instead
  33  * of those above. If you wish to allow use of your version of this file only
  34  * under the terms of either the GPL or the LGPL, and not to allow others to
  35  * use your version of this file under the terms of the MPL, indicate your
  36  * decision by deleting the provisions above and replace them with the notice
  37  * and other provisions required by the GPL or the LGPL. If you do not delete
  38  * the provisions above, a recipient may use your version of this file under
  39  * the terms of any one of the MPL, the GPL or the LGPL.
  40  *
  41  */
  42
  43 #ifndef DateMath_h
  44 #define DateMath_h
  45
  46 #include <stdint.h>
  47 #include <string.h>
  48 #include "wtf/text/WTFString.h"
  49 #include "wtf/WTFExport.h"
  50
  51 namespace WTF {
  52
  53 WTF_EXPORT void initializeDates();
  54
  55 // Not really math related, but this is currently the only shared place to put these.
  56 WTF_EXPORT double parseDateFromNullTerminatedCharacters(const char* dateString);
  57 // dayOfWeek: [0, 6] 0 being Monday, day: [1, 31], month: [0, 11], year: ex: 2011, hours: [0, 23], minutes: [0, 59], seconds: [0, 59], utcOffset: [-720,720].
  58 WTF_EXPORT String makeRFC2822DateString(unsigned dayOfWeek, unsigned day, unsigned month, unsigned year, unsigned hours, unsigned minutes, unsigned seconds, int utcOffset);
  59
  60 const char weekdayName[7][4] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
  61 const char monthName[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  62 const char* const monthFullName[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
  63
  64 const double minutesPerHour = 60.0;
  65 const double secondsPerMinute = 60.0;
  66 const double msPerSecond = 1000.0;
  67 const double msPerMinute = 60.0 * 1000.0;
  68 const double msPerHour = 60.0 * 60.0 * 1000.0;
  69 const double msPerDay = 24.0 * 60.0 * 60.0 * 1000.0;
  70
  71 WTF_EXPORT bool isLeapYear(int year);
  72
  73 // Returns the number of days from 1970-01-01 to the specified date.
  74 WTF_EXPORT double dateToDaysFrom1970(int year, int month, int day);
  75 WTF_EXPORT int msToYear(double ms);
  76 WTF_EXPORT int dayInYear(int year, int month, int day);
  77 WTF_EXPORT int dayInYear(double ms, int year);
  78 WTF_EXPORT int monthFromDayInYear(int dayInYear, bool leapYear);
  79 WTF_EXPORT int dayInMonthFromDayInYear(int dayInYear, bool leapYear);
  80
  81 // Returns milliseconds with UTC and DST.
  82 WTF_EXPORT double convertToLocalTime(double ms);
  83
  84 } // namespace WTF
  85
  86 using WTF::isLeapYear;
  87 using WTF::dateToDaysFrom1970;
  88 using WTF::dayInMonthFromDayInYear;
  89 using WTF::dayInYear;
  90 using WTF::minutesPerHour;
  91 using WTF::monthFromDayInYear;
  92 using WTF::msPerDay;
  93 using WTF::msPerHour;
  94 using WTF::msPerMinute;
  95 using WTF::msPerSecond;
  96 using WTF::msToYear;
  97 using WTF::secondsPerMinute;
  98 using WTF::parseDateFromNullTerminatedCharacters;
  99 using WTF::makeRFC2822DateString;
 100 using WTF::convertToLocalTime;
 101
 102 #endif // DateMath_h