v8/src/date.js

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// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This file relies on the fact that the following declarations have been made
// in v8natives.js:
// const $isFinite = GlobalIsFinite;
// -------------------------------------------------------------------
// This file contains date support implemented in JavaScript.
// Keep reference to original values of some global properties. This
// has the added benefit that the code in this file is isolated from
// changes to these properties.
const $Date = global.Date;
// Helper function to throw error.
function ThrowDateTypeError() {
throw new $TypeError('this is not a Date object.');
}
// ECMA 262 - 5.2
function Modulo(value, remainder) {
var mod = value % remainder;
// Guard against returning -0.
if (mod == 0) return 0;
return mod >= 0 ? mod : mod + remainder;
}
function TimeWithinDay(time) {
return Modulo(time, msPerDay);
}
// ECMA 262 - 15.9.1.3
function DaysInYear(year) {
if (year % 4 != 0) return 365;
if ((year % 100 == 0) && (year % 400 != 0)) return 365;
return 366;
}
function DayFromYear(year) {
return 365 * (year-1970)
+ FLOOR((year-1969)/4)
- FLOOR((year-1901)/100)
+ FLOOR((year-1601)/400);
}
function TimeFromYear(year) {
return msPerDay * DayFromYear(year);
}
function InLeapYear(time) {
return DaysInYear(YEAR_FROM_TIME(time)) == 366 ? 1 : 0;
}
function DayWithinYear(time) {
return DAY(time) - DayFromYear(YEAR_FROM_TIME(time));
}
// ECMA 262 - 15.9.1.9
function EquivalentYear(year) {
// Returns an equivalent year in the range [2008-2035] matching
// - leap year.
// - week day of first day.
var time = TimeFromYear(year);
var recent_year = (InLeapYear(time) == 0 ? 1967 : 1956) +
(WeekDay(time) * 12) % 28;
// Find the year in the range 2008..2037 that is equivalent mod 28.
// Add 3*28 to give a positive argument to the modulus operator.
return 2008 + (recent_year + 3*28 - 2008) % 28;
}
function EquivalentTime(t) {
// The issue here is that some library calls don't work right for dates
// that cannot be represented using a non-negative signed 32 bit integer
// (measured in whole seconds based on the 1970 epoch).
// We solve this by mapping the time to a year with same leap-year-ness
// and same starting day for the year. The ECMAscript specification says
// we must do this, but for compatibility with other browsers, we use
// the actual year if it is in the range 1970..2037
if (t >= 0 && t <= 2.1e12) return t;
var day = MakeDay(EquivalentYear(YEAR_FROM_TIME(t)),
MONTH_FROM_TIME(t),
DATE_FROM_TIME(t));
return MakeDate(day, TimeWithinDay(t));
}
// local_time_offset is initialized when the DST_offset_cache is missed.
// It must not be used until after a call to DaylightSavingsOffset().
// In this way, only one check, for a DST cache miss, is needed.
var local_time_offset;
// Because computing the DST offset is an expensive operation,
// we keep a cache of the last computed DST offset along with a time interval
// where we know the cache is valid.
// When the cache is valid, local_time_offset is also valid.
var DST_offset_cache = {
// Cached DST offset.
offset: 0,
// Time interval where the cached offset is valid.
start: 0, end: -1,
// Size of next interval expansion.
increment: 0,
initial_increment: 19 * msPerDay
};
// NOTE: The implementation relies on the fact that no time zones have
// more than one daylight savings offset change per 19 days.
//
// In Egypt in 2010 they decided to suspend DST during Ramadan. This
// led to a short interval where DST is in effect from September 10 to
// September 30.
//
// If this function is called with NaN it returns NaN.
function DaylightSavingsOffset(t) {
// Load the cache object from the builtins object.
var cache = DST_offset_cache;
// Cache the start and the end in local variables for fast access.
var start = cache.start;
var end = cache.end;
if (start <= t) {
// If the time fits in the cached interval, return the cached offset.
if (t <= end) return cache.offset;
// If the cache misses, the local_time_offset may not be initialized.
if (IS_UNDEFINED(local_time_offset)) {
local_time_offset = %DateLocalTimeOffset();
}
// Compute a possible new interval end.
var new_end = end + cache.increment;
if (t <= new_end) {
var end_offset = %DateDaylightSavingsOffset(EquivalentTime(new_end));
if (cache.offset == end_offset) {
// If the offset at the end of the new interval still matches
// the offset in the cache, we grow the cached time interval
// and return the offset.
cache.end = new_end;
cache.increment = cache.initial_increment;
return end_offset;
} else {
var offset = %DateDaylightSavingsOffset(EquivalentTime(t));
if (offset == end_offset) {
// The offset at the given time is equal to the offset at the
// new end of the interval, so that means that we've just skipped
// the point in time where the DST offset change occurred. Updated
// the interval to reflect this and reset the increment.
cache.start = t;
cache.end = new_end;
cache.increment = cache.initial_increment;
} else {
// The interval contains a DST offset change and the given time is
// before it. Adjust the increment to avoid a linear search for
// the offset change point and change the end of the interval.
cache.increment /= 3;
cache.end = t;
}
// Update the offset in the cache and return it.
cache.offset = offset;
return offset;
}
}
}
// If the cache misses, the local_time_offset may not be initialized.
if (IS_UNDEFINED(local_time_offset)) {
local_time_offset = %DateLocalTimeOffset();
}
// Compute the DST offset for the time and shrink the cache interval
// to only contain the time. This allows fast repeated DST offset
// computations for the same time.
var offset = %DateDaylightSavingsOffset(EquivalentTime(t));
cache.offset = offset;
cache.start = cache.end = t;
cache.increment = cache.initial_increment;
return offset;
}
var timezone_cache_time = $NaN;
var timezone_cache_timezone;
function LocalTimezone(t) {
if (NUMBER_IS_NAN(t)) return "";
if (t == timezone_cache_time) {
return timezone_cache_timezone;
}
var timezone = %DateLocalTimezone(EquivalentTime(t));
timezone_cache_time = t;
timezone_cache_timezone = timezone;
return timezone;
}
function WeekDay(time) {
return Modulo(DAY(time) + 4, 7);
}
function LocalTime(time) {
if (NUMBER_IS_NAN(time)) return time;
// DaylightSavingsOffset called before local_time_offset used.
return time + DaylightSavingsOffset(time) + local_time_offset;
}
var ltcache = {
key: null,
val: null
};
function LocalTimeNoCheck(time) {
var ltc = ltcache;
if (%_ObjectEquals(time, ltc.key)) return ltc.val;
if (time < -MAX_TIME_MS || time > MAX_TIME_MS) {
return $NaN;
}
// Inline the DST offset cache checks for speed.
// The cache is hit, or DaylightSavingsOffset is called,
// before local_time_offset is used.
var cache = DST_offset_cache;
if (cache.start <= time && time <= cache.end) {
var dst_offset = cache.offset;
} else {
var dst_offset = DaylightSavingsOffset(time);
}
ltc.key = time;
return (ltc.val = time + local_time_offset + dst_offset);
}
function UTC(time) {
if (NUMBER_IS_NAN(time)) return time;
// local_time_offset is needed before the call to DaylightSavingsOffset,
// so it may be uninitialized.
if (IS_UNDEFINED(local_time_offset)) {
local_time_offset = %DateLocalTimeOffset();
}
var tmp = time - local_time_offset;
return tmp - DaylightSavingsOffset(tmp);
}
// ECMA 262 - 15.9.1.11
function MakeTime(hour, min, sec, ms) {
if (!$isFinite(hour)) return $NaN;
if (!$isFinite(min)) return $NaN;
if (!$isFinite(sec)) return $NaN;
if (!$isFinite(ms)) return $NaN;
return TO_INTEGER(hour) * msPerHour
+ TO_INTEGER(min) * msPerMinute
+ TO_INTEGER(sec) * msPerSecond
+ TO_INTEGER(ms);
}
// ECMA 262 - 15.9.1.12
function TimeInYear(year) {
return DaysInYear(year) * msPerDay;
}
var ymd_from_time_cache = [$NaN, $NaN, $NaN];
var ymd_from_time_cached_time = $NaN;
function YearFromTime(t) {
if (t !== ymd_from_time_cached_time) {
if (!$isFinite(t)) {
return $NaN;
}
%DateYMDFromTime(t, ymd_from_time_cache);
ymd_from_time_cached_time = t
}
return ymd_from_time_cache[0];
}
function MonthFromTime(t) {
if (t !== ymd_from_time_cached_time) {
if (!$isFinite(t)) {
return $NaN;
}
%DateYMDFromTime(t, ymd_from_time_cache);
ymd_from_time_cached_time = t
}
return ymd_from_time_cache[1];
}
function DateFromTime(t) {
if (t !== ymd_from_time_cached_time) {
if (!$isFinite(t)) {
return $NaN;
}
%DateYMDFromTime(t, ymd_from_time_cache);
ymd_from_time_cached_time = t
}
return ymd_from_time_cache[2];
}
// Compute number of days given a year, month, date.
// Note that month and date can lie outside the normal range.
// For example:
// MakeDay(2007, -4, 20) --> MakeDay(2006, 8, 20)
// MakeDay(2007, -33, 1) --> MakeDay(2004, 3, 1)
// MakeDay(2007, 14, -50) --> MakeDay(2007, 8, 11)
function MakeDay(year, month, date) {
if (!$isFinite(year) || !$isFinite(month) || !$isFinite(date)) return $NaN;
// Convert to integer and map -0 to 0.
year = TO_INTEGER_MAP_MINUS_ZERO(year);
month = TO_INTEGER_MAP_MINUS_ZERO(month);
date = TO_INTEGER_MAP_MINUS_ZERO(date);
if (year < kMinYear || year > kMaxYear ||
month < kMinMonth || month > kMaxMonth ||
date < kMinDate || date > kMaxDate) {
return $NaN;
}
// Now we rely on year, month and date being SMIs.
return %DateMakeDay(year, month, date);
}
// ECMA 262 - 15.9.1.13
function MakeDate(day, time) {
if (!$isFinite(day)) return $NaN;
if (!$isFinite(time)) return $NaN;
return day * msPerDay + time;
}
// ECMA 262 - 15.9.1.14
function TimeClip(time) {
if (!$isFinite(time)) return $NaN;
if ($abs(time) > 8.64E15) return $NaN;
return TO_INTEGER(time);
}
// The Date cache is used to limit the cost of parsing the same Date
// strings over and over again.
var Date_cache = {
// Cached time value.
time: $NaN,
// Cached year when interpreting the time as a local time. Only
// valid when the time matches cached time.
year: $NaN,
// String input for which the cached time is valid.
string: null
};
%SetCode($Date, function(year, month, date, hours, minutes, seconds, ms) {
if (!%_IsConstructCall()) {
// ECMA 262 - 15.9.2
return (new $Date()).toString();
}
// ECMA 262 - 15.9.3
var argc = %_ArgumentsLength();
var value;
if (argc == 0) {
value = %DateCurrentTime();
} else if (argc == 1) {
if (IS_NUMBER(year)) {
value = TimeClip(year);
} else if (IS_STRING(year)) {
// Probe the Date cache. If we already have a time value for the
// given time, we re-use that instead of parsing the string again.
var cache = Date_cache;
if (cache.string === year) {
value = cache.time;
} else {
value = DateParse(year);
if (!NUMBER_IS_NAN(value)) {
cache.time = value;
cache.year = YEAR_FROM_TIME(LocalTimeNoCheck(value));
cache.string = year;
}
}
} else {
// According to ECMA 262, no hint should be given for this
// conversion. However, ToPrimitive defaults to STRING_HINT for
// Date objects which will lose precision when the Date
// constructor is called with another Date object as its
// argument. We therefore use NUMBER_HINT for the conversion,
// which is the default for everything else than Date objects.
// This makes us behave like KJS and SpiderMonkey.
var time = ToPrimitive(year, NUMBER_HINT);
value = IS_STRING(time) ? DateParse(time) : TimeClip(ToNumber(time));
}
} else {
year = ToNumber(year);
month = ToNumber(month);
date = argc > 2 ? ToNumber(date) : 1;
hours = argc > 3 ? ToNumber(hours) : 0;
minutes = argc > 4 ? ToNumber(minutes) : 0;
seconds = argc > 5 ? ToNumber(seconds) : 0;
ms = argc > 6 ? ToNumber(ms) : 0;
year = (!NUMBER_IS_NAN(year) && 0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
? 1900 + TO_INTEGER(year) : year;
var day = MakeDay(year, month, date);
var time = MakeTime(hours, minutes, seconds, ms);
value = TimeClip(UTC(MakeDate(day, time)));
}
%_SetValueOf(this, value);
});
%FunctionSetPrototype($Date, new $Date($NaN));
var WeekDays = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
var Months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
function TwoDigitString(value) {
return value < 10 ? "0" + value : "" + value;
}
function DateString(time) {
return WeekDays[WeekDay(time)] + ' '
+ Months[MonthFromTime(time)] + ' '
+ TwoDigitString(DateFromTime(time)) + ' '
+ YearFromTime(time);
}
var LongWeekDays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
var LongMonths = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
function LongDateString(time) {
return LongWeekDays[WeekDay(time)] + ', '
+ LongMonths[MonthFromTime(time)] + ' '
+ TwoDigitString(DateFromTime(time)) + ', '
+ YearFromTime(time);
}
function TimeString(time) {
return TwoDigitString(HOUR_FROM_TIME(time)) + ':'
+ TwoDigitString(MIN_FROM_TIME(time)) + ':'
+ TwoDigitString(SEC_FROM_TIME(time));
}
function LocalTimezoneString(time) {
var old_timezone = timezone_cache_timezone;
var timezone = LocalTimezone(time);
if (old_timezone && timezone != old_timezone) {
// If the timezone string has changed from the one that we cached,
// the local time offset may now be wrong. So we need to update it
// and try again.
local_time_offset = %DateLocalTimeOffset();
// We also need to invalidate the DST cache as the new timezone may have
// different DST times.
var dst_cache = DST_offset_cache;
dst_cache.start = 0;
dst_cache.end = -1;
}
var timezoneOffset =
(DaylightSavingsOffset(time) + local_time_offset) / msPerMinute;
var sign = (timezoneOffset >= 0) ? 1 : -1;
var hours = FLOOR((sign * timezoneOffset)/60);
var min = FLOOR((sign * timezoneOffset)%60);
var gmt = ' GMT' + ((sign == 1) ? '+' : '-') +
TwoDigitString(hours) + TwoDigitString(min);
return gmt + ' (' + timezone + ')';
}
function DatePrintString(time) {
return DateString(time) + ' ' + TimeString(time);
}
// -------------------------------------------------------------------
// Reused output buffer. Used when parsing date strings.
var parse_buffer = $Array(8);
// ECMA 262 - 15.9.4.2
function DateParse(string) {
var arr = %DateParseString(ToString(string), parse_buffer);
if (IS_NULL(arr)) return $NaN;
var day = MakeDay(arr[0], arr[1], arr[2]);
var time = MakeTime(arr[3], arr[4], arr[5], arr[6]);
var date = MakeDate(day, time);
if (IS_NULL(arr[7])) {
return TimeClip(UTC(date));
} else {
return TimeClip(date - arr[7] * 1000);
}
}
// ECMA 262 - 15.9.4.3
function DateUTC(year, month, date, hours, minutes, seconds, ms) {
year = ToNumber(year);
month = ToNumber(month);
var argc = %_ArgumentsLength();
date = argc > 2 ? ToNumber(date) : 1;
hours = argc > 3 ? ToNumber(hours) : 0;
minutes = argc > 4 ? ToNumber(minutes) : 0;
seconds = argc > 5 ? ToNumber(seconds) : 0;
ms = argc > 6 ? ToNumber(ms) : 0;
year = (!NUMBER_IS_NAN(year) && 0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
? 1900 + TO_INTEGER(year) : year;
var day = MakeDay(year, month, date);
var time = MakeTime(hours, minutes, seconds, ms);
return %_SetValueOf(this, TimeClip(MakeDate(day, time)));
}
// Mozilla-specific extension. Returns the number of milliseconds
// elapsed since 1 January 1970 00:00:00 UTC.
function DateNow() {
return %DateCurrentTime();
}
// ECMA 262 - 15.9.5.2
function DateToString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
var time_zone_string = LocalTimezoneString(t); // May update local offset.
return DatePrintString(LocalTimeNoCheck(t)) + time_zone_string;
}
// ECMA 262 - 15.9.5.3
function DateToDateString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
return DateString(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.4
function DateToTimeString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
var time_zone_string = LocalTimezoneString(t); // May update local offset.
return TimeString(LocalTimeNoCheck(t)) + time_zone_string;
}
// ECMA 262 - 15.9.5.5
function DateToLocaleString() {
return DateToString.call(this);
}
// ECMA 262 - 15.9.5.6
function DateToLocaleDateString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
return LongDateString(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.7
function DateToLocaleTimeString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
var lt = LocalTimeNoCheck(t);
return TimeString(lt);
}
// ECMA 262 - 15.9.5.8
function DateValueOf() {
return DATE_VALUE(this);
}
// ECMA 262 - 15.9.5.9
function DateGetTime() {
return DATE_VALUE(this);
}
// ECMA 262 - 15.9.5.10
function DateGetFullYear() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
var cache = Date_cache;
if (cache.time === t) return cache.year;
return YEAR_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.11
function DateGetUTCFullYear() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return YEAR_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.12
function DateGetMonth() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return MONTH_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.13
function DateGetUTCMonth() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return MONTH_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.14
function DateGetDate() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return DATE_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.15
function DateGetUTCDate() {
var t = DATE_VALUE(this);
return NAN_OR_DATE_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.16
function DateGetDay() {
var t = %_ValueOf(this);
if (NUMBER_IS_NAN(t)) return t;
return WeekDay(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.17
function DateGetUTCDay() {
var t = %_ValueOf(this);
if (NUMBER_IS_NAN(t)) return t;
return WeekDay(t);
}
// ECMA 262 - 15.9.5.18
function DateGetHours() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return HOUR_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.19
function DateGetUTCHours() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return HOUR_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.20
function DateGetMinutes() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return MIN_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.21
function DateGetUTCMinutes() {
var t = DATE_VALUE(this);
return NAN_OR_MIN_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.22
function DateGetSeconds() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return SEC_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.23
function DateGetUTCSeconds() {
var t = DATE_VALUE(this);
return NAN_OR_SEC_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.24
function DateGetMilliseconds() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return MS_FROM_TIME(LocalTimeNoCheck(t));
}
// ECMA 262 - 15.9.5.25
function DateGetUTCMilliseconds() {
var t = DATE_VALUE(this);
return NAN_OR_MS_FROM_TIME(t);
}
// ECMA 262 - 15.9.5.26
function DateGetTimezoneOffset() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return t;
return (t - LocalTimeNoCheck(t)) / msPerMinute;
}
// ECMA 262 - 15.9.5.27
function DateSetTime(ms) {
if (!IS_DATE(this)) ThrowDateTypeError();
return %_SetValueOf(this, TimeClip(ToNumber(ms)));
}
// ECMA 262 - 15.9.5.28
function DateSetMilliseconds(ms) {
var t = LocalTime(DATE_VALUE(this));
ms = ToNumber(ms);
var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), SEC_FROM_TIME(t), ms);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
}
// ECMA 262 - 15.9.5.29
function DateSetUTCMilliseconds(ms) {
var t = DATE_VALUE(this);
ms = ToNumber(ms);
var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), SEC_FROM_TIME(t), ms);
return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
}
// ECMA 262 - 15.9.5.30
function DateSetSeconds(sec, ms) {
var t = LocalTime(DATE_VALUE(this));
sec = ToNumber(sec);
ms = %_ArgumentsLength() < 2 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), sec, ms);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
}
// ECMA 262 - 15.9.5.31
function DateSetUTCSeconds(sec, ms) {
var t = DATE_VALUE(this);
sec = ToNumber(sec);
ms = %_ArgumentsLength() < 2 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), sec, ms);
return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
}
// ECMA 262 - 15.9.5.33
function DateSetMinutes(min, sec, ms) {
var t = LocalTime(DATE_VALUE(this));
min = ToNumber(min);
var argc = %_ArgumentsLength();
sec = argc < 2 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
ms = argc < 3 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
var time = MakeTime(HOUR_FROM_TIME(t), min, sec, ms);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
}
// ECMA 262 - 15.9.5.34
function DateSetUTCMinutes(min, sec, ms) {
var t = DATE_VALUE(this);
min = ToNumber(min);
var argc = %_ArgumentsLength();
sec = argc < 2 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
ms = argc < 3 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
var time = MakeTime(HOUR_FROM_TIME(t), min, sec, ms);
return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
}
// ECMA 262 - 15.9.5.35
function DateSetHours(hour, min, sec, ms) {
var t = LocalTime(DATE_VALUE(this));
hour = ToNumber(hour);
var argc = %_ArgumentsLength();
min = argc < 2 ? NAN_OR_MIN_FROM_TIME(t) : ToNumber(min);
sec = argc < 3 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
ms = argc < 4 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
var time = MakeTime(hour, min, sec, ms);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
}
// ECMA 262 - 15.9.5.34
function DateSetUTCHours(hour, min, sec, ms) {
var t = DATE_VALUE(this);
hour = ToNumber(hour);
var argc = %_ArgumentsLength();
min = argc < 2 ? NAN_OR_MIN_FROM_TIME(t) : ToNumber(min);
sec = argc < 3 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
ms = argc < 4 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
var time = MakeTime(hour, min, sec, ms);
return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
}
// ECMA 262 - 15.9.5.36
function DateSetDate(date) {
var t = LocalTime(DATE_VALUE(this));
date = ToNumber(date);
var day = MakeDay(YEAR_FROM_TIME(t), MONTH_FROM_TIME(t), date);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
}
// ECMA 262 - 15.9.5.37
function DateSetUTCDate(date) {
var t = DATE_VALUE(this);
date = ToNumber(date);
var day = MakeDay(YEAR_FROM_TIME(t), MONTH_FROM_TIME(t), date);
return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
}
// ECMA 262 - 15.9.5.38
function DateSetMonth(month, date) {
var t = LocalTime(DATE_VALUE(this));
month = ToNumber(month);
date = %_ArgumentsLength() < 2 ? NAN_OR_DATE_FROM_TIME(t) : ToNumber(date);
var day = MakeDay(YEAR_FROM_TIME(t), month, date);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
}
// ECMA 262 - 15.9.5.39
function DateSetUTCMonth(month, date) {
var t = DATE_VALUE(this);
month = ToNumber(month);
date = %_ArgumentsLength() < 2 ? NAN_OR_DATE_FROM_TIME(t) : ToNumber(date);
var day = MakeDay(YEAR_FROM_TIME(t), month, date);
return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
}
// ECMA 262 - 15.9.5.40
function DateSetFullYear(year, month, date) {
var t = DATE_VALUE(this);
t = NUMBER_IS_NAN(t) ? 0 : LocalTimeNoCheck(t);
year = ToNumber(year);
var argc = %_ArgumentsLength();
month = argc < 2 ? MONTH_FROM_TIME(t) : ToNumber(month);
date = argc < 3 ? DATE_FROM_TIME(t) : ToNumber(date);
var day = MakeDay(year, month, date);
return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
}
// ECMA 262 - 15.9.5.41
function DateSetUTCFullYear(year, month, date) {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) t = 0;
var argc = %_ArgumentsLength();
year = ToNumber(year);
month = argc < 2 ? MONTH_FROM_TIME(t) : ToNumber(month);
date = argc < 3 ? DATE_FROM_TIME(t) : ToNumber(date);
var day = MakeDay(year, month, date);
return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
}
// ECMA 262 - 15.9.5.42
function DateToUTCString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
// Return UTC string of the form: Sat, 31 Jan 1970 23:00:00 GMT
return WeekDays[WeekDay(t)] + ', '
+ TwoDigitString(DATE_FROM_TIME(t)) + ' '
+ Months[MONTH_FROM_TIME(t)] + ' '
+ YEAR_FROM_TIME(t) + ' '
+ TimeString(t) + ' GMT';
}
// ECMA 262 - B.2.4
function DateGetYear() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return $NaN;
return YEAR_FROM_TIME(LocalTimeNoCheck(t)) - 1900;
}
// ECMA 262 - B.2.5
function DateSetYear(year) {
var t = LocalTime(DATE_VALUE(this));
if (NUMBER_IS_NAN(t)) t = 0;
year = ToNumber(year);
if (NUMBER_IS_NAN(year)) return %_SetValueOf(this, $NaN);
year = (0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
? 1900 + TO_INTEGER(year) : year;
var day = MakeDay(year, MONTH_FROM_TIME(t), DATE_FROM_TIME(t));
return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
}
// ECMA 262 - B.2.6
//
// Notice that this does not follow ECMA 262 completely. ECMA 262
// says that toGMTString should be the same Function object as
// toUTCString. JSC does not do this, so for compatibility we do not
// do that either. Instead, we create a new function whose name
// property will return toGMTString.
function DateToGMTString() {
return DateToUTCString.call(this);
}
function PadInt(n, digits) {
if (digits == 1) return n;
return n < MathPow(10, digits - 1) ? '0' + PadInt(n, digits - 1) : n;
}
function DateToISOString() {
var t = DATE_VALUE(this);
if (NUMBER_IS_NAN(t)) return kInvalidDate;
return this.getUTCFullYear() + '-' + PadInt(this.getUTCMonth() + 1, 2) +
'-' + PadInt(this.getUTCDate(), 2) + 'T' + PadInt(this.getUTCHours(), 2) +
':' + PadInt(this.getUTCMinutes(), 2) + ':' + PadInt(this.getUTCSeconds(), 2) +
'.' + PadInt(this.getUTCMilliseconds(), 3) +
'Z';
}
function DateToJSON(key) {
return CheckJSONPrimitive(this.toISOString());
}
// -------------------------------------------------------------------
function SetupDate() {
// Setup non-enumerable properties of the Date object itself.
InstallFunctions($Date, DONT_ENUM, $Array(
"UTC", DateUTC,
"parse", DateParse,
"now", DateNow
));
// Setup non-enumerable constructor property of the Date prototype object.
%SetProperty($Date.prototype, "constructor", $Date, DONT_ENUM);
// Setup non-enumerable functions of the Date prototype object and
// set their names.
InstallFunctionsOnHiddenPrototype($Date.prototype, DONT_ENUM, $Array(
"toString", DateToString,
"toDateString", DateToDateString,
"toTimeString", DateToTimeString,
"toLocaleString", DateToLocaleString,
"toLocaleDateString", DateToLocaleDateString,
"toLocaleTimeString", DateToLocaleTimeString,
"valueOf", DateValueOf,
"getTime", DateGetTime,
"getFullYear", DateGetFullYear,
"getUTCFullYear", DateGetUTCFullYear,
"getMonth", DateGetMonth,
"getUTCMonth", DateGetUTCMonth,
"getDate", DateGetDate,
"getUTCDate", DateGetUTCDate,
"getDay", DateGetDay,
"getUTCDay", DateGetUTCDay,
"getHours", DateGetHours,
"getUTCHours", DateGetUTCHours,
"getMinutes", DateGetMinutes,
"getUTCMinutes", DateGetUTCMinutes,
"getSeconds", DateGetSeconds,
"getUTCSeconds", DateGetUTCSeconds,
"getMilliseconds", DateGetMilliseconds,
"getUTCMilliseconds", DateGetUTCMilliseconds,
"getTimezoneOffset", DateGetTimezoneOffset,
"setTime", DateSetTime,
"setMilliseconds", DateSetMilliseconds,
"setUTCMilliseconds", DateSetUTCMilliseconds,
"setSeconds", DateSetSeconds,
"setUTCSeconds", DateSetUTCSeconds,
"setMinutes", DateSetMinutes,
"setUTCMinutes", DateSetUTCMinutes,
"setHours", DateSetHours,
"setUTCHours", DateSetUTCHours,
"setDate", DateSetDate,
"setUTCDate", DateSetUTCDate,
"setMonth", DateSetMonth,
"setUTCMonth", DateSetUTCMonth,
"setFullYear", DateSetFullYear,
"setUTCFullYear", DateSetUTCFullYear,
"toGMTString", DateToGMTString,
"toUTCString", DateToUTCString,
"getYear", DateGetYear,
"setYear", DateSetYear,
"toISOString", DateToISOString,
"toJSON", DateToJSON
));
}
SetupDate();