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 <math.h>
47#include <stdint.h>
48#include <string.h>
49#include <time.h>
50#include <wtf/CurrentTime.h>
51#include <wtf/Noncopyable.h>
52#include <wtf/text/WTFString.h>
53
54namespace WTF {
55
56enum TimeType {
57 UTCTime = 0,
58 LocalTime
59};
60
61struct LocalTimeOffset {
62 LocalTimeOffset()
63 : isDST(false)
64 , offset(0)
65 {
66 }
67
68 LocalTimeOffset(bool isDST, int offset)
69 : isDST(isDST)
70 , offset(offset)
71 {
72 }
73
74 bool operator==(const LocalTimeOffset& other)
75 {
76 return isDST == other.isDST && offset == other.offset;
77 }
78
79 bool operator!=(const LocalTimeOffset& other)
80 {
81 return isDST != other.isDST || offset != other.offset;
82 }
83
84 bool isDST;
85 int offset;
86};
87
88void initializeDates();
89int equivalentYearForDST(int year);
90
91// Not really math related, but this is currently the only shared place to put these.
92WTF_EXPORT_PRIVATE double parseES5DateFromNullTerminatedCharacters(const char* dateString);
93WTF_EXPORT_PRIVATE double parseDateFromNullTerminatedCharacters(const char* dateString);
94WTF_EXPORT_PRIVATE double parseDateFromNullTerminatedCharacters(const char* dateString, bool& haveTZ, int& offset);
95WTF_EXPORT_PRIVATE double timeClip(double);
96// 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].
97WTF_EXPORT_PRIVATE String makeRFC2822DateString(unsigned dayOfWeek, unsigned day, unsigned month, unsigned year, unsigned hours, unsigned minutes, unsigned seconds, int utcOffset);
98
99inline double jsCurrentTime()
100{
101 // JavaScript doesn't recognize fractions of a millisecond.
102 return floor(WTF::currentTimeMS());
103}
104
105const char* const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
106const char* const monthName[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
107const char* const monthFullName[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
108
109const double hoursPerDay = 24.0;
110const double minutesPerHour = 60.0;
111const double secondsPerMinute = 60.0;
112const double msPerSecond = 1000.0;
113const double msPerMonth = 2592000000.0;
114const double secondsPerHour = secondsPerMinute * minutesPerHour;
115const double secondsPerDay = secondsPerHour * hoursPerDay;
116const double msPerMinute = msPerSecond * secondsPerMinute;
117const double msPerHour = msPerSecond * secondsPerHour;
118const double msPerDay = msPerSecond * secondsPerDay;
119
120WTF_EXPORT_PRIVATE bool isLeapYear(int year);
121
122// Returns the number of days from 1970-01-01 to the specified date.
123WTF_EXPORT_PRIVATE double dateToDaysFrom1970(int year, int month, int day);
124WTF_EXPORT_PRIVATE int msToYear(double ms);
125WTF_EXPORT_PRIVATE double msToDays(double ms);
126WTF_EXPORT_PRIVATE int msToMinutes(double ms);
127WTF_EXPORT_PRIVATE int msToHours(double ms);
128WTF_EXPORT_PRIVATE int dayInYear(int year, int month, int day);
129WTF_EXPORT_PRIVATE int dayInYear(double ms, int year);
130WTF_EXPORT_PRIVATE int monthFromDayInYear(int dayInYear, bool leapYear);
131WTF_EXPORT_PRIVATE int dayInMonthFromDayInYear(int dayInYear, bool leapYear);
132
133// Returns combined offset in millisecond (UTC + DST).
134WTF_EXPORT_PRIVATE LocalTimeOffset calculateLocalTimeOffset(double utcInMilliseconds, TimeType = UTCTime);
135
136} // namespace WTF
137
138using WTF::isLeapYear;
139using WTF::dateToDaysFrom1970;
140using WTF::dayInMonthFromDayInYear;
141using WTF::dayInYear;
142using WTF::minutesPerHour;
143using WTF::monthFromDayInYear;
144using WTF::msPerDay;
145using WTF::msPerHour;
146using WTF::msPerMinute;
147using WTF::msPerSecond;
148using WTF::msToYear;
149using WTF::msToDays;
150using WTF::msToMinutes;
151using WTF::msToHours;
152using WTF::secondsPerDay;
153using WTF::secondsPerMinute;
154using WTF::parseDateFromNullTerminatedCharacters;
155using WTF::makeRFC2822DateString;
156using WTF::LocalTimeOffset;
157using WTF::calculateLocalTimeOffset;
158
159#endif // DateMath_h
160