1 /* 2 * Copyright (C) 1999-2000 Harri Porten (porten (at) kde.org) 3 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. 4 * Copyright (C) 2009 Google Inc. All rights reserved. 5 * 6 * Version: MPL 1.1/GPL 2.0/LGPL 2.1 7 * 8 * The contents of this file are subject to the Mozilla Public License Version 9 * 1.1 (the "License"); you may not use this file except in compliance with 10 * the License. You may obtain a copy of the License at 11 * http://www.mozilla.org/MPL/ 12 * 13 * Software distributed under the License is distributed on an "AS IS" basis, 14 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 15 * for the specific language governing rights and limitations under the 16 * License. 17 * 18 * The Original Code is Mozilla Communicator client code, released 19 * March 31, 1998. 20 * 21 * The Initial Developer of the Original Code is 22 * Netscape Communications Corporation. 23 * Portions created by the Initial Developer are Copyright (C) 1998 24 * the Initial Developer. All Rights Reserved. 25 * 26 * Contributor(s): 27 * 28 * Alternatively, the contents of this file may be used under the terms of 29 * either of the GNU General Public License Version 2 or later (the "GPL"), 30 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), 31 * in which case the provisions of the GPL or the LGPL are applicable instead 32 * of those above. If you wish to allow use of your version of this file only 33 * under the terms of either the GPL or the LGPL, and not to allow others to 34 * use your version of this file under the terms of the MPL, indicate your 35 * decision by deleting the provisions above and replace them with the notice 36 * and other provisions required by the GPL or the LGPL. If you do not delete 37 * the provisions above, a recipient may use your version of this file under 38 * the terms of any one of the MPL, the GPL or the LGPL. 39 * 40 */ 41 42 #ifndef DateMath_h 43 #define DateMath_h 44 45 #include <math.h> 46 #include <string.h> 47 #include <time.h> 48 #include <wtf/CurrentTime.h> 49 #include <wtf/Noncopyable.h> 50 #include <wtf/UnusedParam.h> 51 52 namespace WTF { 53 void initializeDates(); 54 int equivalentYearForDST(int year); 55 56 // Not really math related, but this is currently the only shared place to put these. 57 double parseDateFromNullTerminatedCharacters(const char* dateString); 58 double timeClip(double); 59 60 inline double jsCurrentTime() 61 { 62 // JavaScript doesn't recognize fractions of a millisecond. 63 return floor(WTF::currentTimeMS()); 64 } 65 66 const char * const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" }; 67 const char * const monthName[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; 68 69 const double hoursPerDay = 24.0; 70 const double minutesPerHour = 60.0; 71 const double secondsPerHour = 60.0 * 60.0; 72 const double secondsPerMinute = 60.0; 73 const double msPerSecond = 1000.0; 74 const double msPerMinute = 60.0 * 1000.0; 75 const double msPerHour = 60.0 * 60.0 * 1000.0; 76 const double msPerDay = 24.0 * 60.0 * 60.0 * 1000.0; 77 const double msPerMonth = 2592000000.0; 78 79 // Returns the number of days from 1970-01-01 to the specified date. 80 double dateToDaysFrom1970(int year, int month, int day); 81 int msToYear(double ms); 82 int dayInYear(double ms, int year); 83 int monthFromDayInYear(int dayInYear, bool leapYear); 84 int dayInMonthFromDayInYear(int dayInYear, bool leapYear); 85 86 } // namespace WTF 87 88 using WTF::dateToDaysFrom1970; 89 using WTF::dayInMonthFromDayInYear; 90 using WTF::dayInYear; 91 using WTF::minutesPerHour; 92 using WTF::monthFromDayInYear; 93 using WTF::msPerDay; 94 using WTF::msPerSecond; 95 using WTF::msToYear; 96 using WTF::secondsPerMinute; 97 98 #if USE(JSC) 99 namespace JSC { 100 class ExecState; 101 struct GregorianDateTime; 102 103 void msToGregorianDateTime(ExecState*, double, bool outputIsUTC, GregorianDateTime&); 104 double gregorianDateTimeToMS(ExecState*, const GregorianDateTime&, double, bool inputIsUTC); 105 double getUTCOffset(ExecState*); 106 double parseDateFromNullTerminatedCharacters(ExecState*, const char* dateString); 107 108 // Intentionally overridding the default tm of the system. 109 // The members of tm differ on various operating systems. 110 struct GregorianDateTime : Noncopyable { 111 GregorianDateTime() 112 : second(0) 113 , minute(0) 114 , hour(0) 115 , weekDay(0) 116 , monthDay(0) 117 , yearDay(0) 118 , month(0) 119 , year(0) 120 , isDST(0) 121 , utcOffset(0) 122 , timeZone(0) 123 { 124 } 125 126 ~GregorianDateTime() 127 { 128 delete [] timeZone; 129 } 130 131 GregorianDateTime(ExecState* exec, const tm& inTm) 132 : second(inTm.tm_sec) 133 , minute(inTm.tm_min) 134 , hour(inTm.tm_hour) 135 , weekDay(inTm.tm_wday) 136 , monthDay(inTm.tm_mday) 137 , yearDay(inTm.tm_yday) 138 , month(inTm.tm_mon) 139 , year(inTm.tm_year) 140 , isDST(inTm.tm_isdst) 141 { 142 UNUSED_PARAM(exec); 143 #if HAVE(TM_GMTOFF) 144 utcOffset = static_cast<int>(inTm.tm_gmtoff); 145 #else 146 utcOffset = static_cast<int>(getUTCOffset(exec) / WTF::msPerSecond + (isDST ? WTF::secondsPerHour : 0)); 147 #endif 148 149 #if HAVE(TM_ZONE) 150 int inZoneSize = strlen(inTm.tm_zone) + 1; 151 timeZone = new char[inZoneSize]; 152 strncpy(timeZone, inTm.tm_zone, inZoneSize); 153 #else 154 timeZone = 0; 155 #endif 156 } 157 158 operator tm() const 159 { 160 tm ret; 161 memset(&ret, 0, sizeof(ret)); 162 163 ret.tm_sec = second; 164 ret.tm_min = minute; 165 ret.tm_hour = hour; 166 ret.tm_wday = weekDay; 167 ret.tm_mday = monthDay; 168 ret.tm_yday = yearDay; 169 ret.tm_mon = month; 170 ret.tm_year = year; 171 ret.tm_isdst = isDST; 172 173 #if HAVE(TM_GMTOFF) 174 ret.tm_gmtoff = static_cast<long>(utcOffset); 175 #endif 176 #if HAVE(TM_ZONE) 177 ret.tm_zone = timeZone; 178 #endif 179 180 return ret; 181 } 182 183 void copyFrom(const GregorianDateTime& rhs) 184 { 185 second = rhs.second; 186 minute = rhs.minute; 187 hour = rhs.hour; 188 weekDay = rhs.weekDay; 189 monthDay = rhs.monthDay; 190 yearDay = rhs.yearDay; 191 month = rhs.month; 192 year = rhs.year; 193 isDST = rhs.isDST; 194 utcOffset = rhs.utcOffset; 195 if (rhs.timeZone) { 196 int inZoneSize = strlen(rhs.timeZone) + 1; 197 timeZone = new char[inZoneSize]; 198 strncpy(timeZone, rhs.timeZone, inZoneSize); 199 } else 200 timeZone = 0; 201 } 202 203 int second; 204 int minute; 205 int hour; 206 int weekDay; 207 int monthDay; 208 int yearDay; 209 int month; 210 int year; 211 int isDST; 212 int utcOffset; 213 char* timeZone; 214 }; 215 216 static inline int gmtoffset(const GregorianDateTime& t) 217 { 218 return t.utcOffset; 219 } 220 } // namespace JSC 221 #endif // USE(JSC) 222 223 #endif // DateMath_h 224
