date.js 30.4 KB
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// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// 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.


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// This file relies on the fact that the following declarations have been made
// in v8natives.js:
// const $isFinite = GlobalIsFinite;

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// -------------------------------------------------------------------

// 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;

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// Helper function to throw error.
function ThrowDateTypeError() {
  throw new $TypeError('this is not a Date object.');
}

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// ECMA 262 - 5.2
function Modulo(value, remainder) {
  var mod = value % remainder;
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  // Guard against returning -0.
  if (mod == 0) return 0;
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  return mod >= 0 ? mod : mod + remainder;
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}
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function TimeWithinDay(time) {
  return Modulo(time, msPerDay);
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}
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// 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;
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}
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function DayFromYear(year) {
  return 365 * (year-1970)
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      + FLOOR((year-1969)/4)
      - FLOOR((year-1901)/100)
      + FLOOR((year-1601)/400);
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}
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function TimeFromYear(year) {
  return msPerDay * DayFromYear(year);
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}
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function InLeapYear(time) {
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  return DaysInYear(YEAR_FROM_TIME(time)) == 366 ? 1 : 0;
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}
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function DayWithinYear(time) {
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  return DAY(time) - DayFromYear(YEAR_FROM_TIME(time));
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}
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// ECMA 262 - 15.9.1.9
function EquivalentYear(year) {
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  // Returns an equivalent year in the range [2008-2035] matching
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  // - leap year.
  // - week day of first day.
  var time = TimeFromYear(year);
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  var recent_year = (InLeapYear(time) == 0 ? 1967 : 1956) +
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      (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;
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}
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function EquivalentTime(t) {
  // The issue here is that some library calls don't work right for dates
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  // that cannot be represented using a non-negative signed 32 bit integer
  // (measured in whole seconds based on the 1970 epoch).
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  // We solve this by mapping the time to a year with same leap-year-ness
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  // and same starting day for the year.  The ECMAscript specification says
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  // we must do this, but for compatibility with other browsers, we use
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  // the actual year if it is in the range 1970..2037
  if (t >= 0 && t <= 2.1e12) return t;
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  var day = MakeDay(EquivalentYear(YEAR_FROM_TIME(t)),
                    MONTH_FROM_TIME(t),
                    DATE_FROM_TIME(t));
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  return MakeDate(day, TimeWithinDay(t));
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}
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// 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
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// where we know the cache is valid.
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// When the cache is valid, local_time_offset is also valid.
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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.
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  increment: 0,
  initial_increment: 19 * msPerDay
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};

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// NOTE: The implementation relies on the fact that no time zones have
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// 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.
//
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// If this function is called with NaN it returns NaN.
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function DaylightSavingsOffset(t) {
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  // 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;

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    // If the cache misses, the local_time_offset may not be initialized.
    if (IS_UNDEFINED(local_time_offset)) {
      local_time_offset = %DateLocalTimeOffset();
    }

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    // 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;
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        cache.increment = cache.initial_increment;
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        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;
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          cache.increment = cache.initial_increment;
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        } 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;
      }
    }
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  }
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  // If the cache misses, the local_time_offset may not be initialized.
  if (IS_UNDEFINED(local_time_offset)) {
    local_time_offset = %DateLocalTimeOffset();
  }
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  // 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.
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  var offset = %DateDaylightSavingsOffset(EquivalentTime(t));
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  cache.offset = offset;
  cache.start = cache.end = t;
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  cache.increment = cache.initial_increment;
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  return offset;
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}
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var timezone_cache_time = $NaN;
var timezone_cache_timezone;

function LocalTimezone(t) {
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  if (NUMBER_IS_NAN(t)) return "";
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  if (t == timezone_cache_time) {
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    return timezone_cache_timezone;
  }
  var timezone = %DateLocalTimezone(EquivalentTime(t));
  timezone_cache_time = t;
  timezone_cache_timezone = timezone;
  return timezone;
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}
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function WeekDay(time) {
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  return Modulo(DAY(time) + 4, 7);
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}
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function LocalTime(time) {
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  if (NUMBER_IS_NAN(time)) return time;
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  // DaylightSavingsOffset called before local_time_offset used.
  return time + DaylightSavingsOffset(time) + local_time_offset;
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}
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var ltcache = {
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  key: null,
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  val: null
};

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function LocalTimeNoCheck(time) {
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  var ltc = ltcache;
  if (%_ObjectEquals(time, ltc.key)) return ltc.val;
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  if (time < -MAX_TIME_MS || time > MAX_TIME_MS) {
    return $NaN;
  }

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  // Inline the DST offset cache checks for speed.
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  // The cache is hit, or DaylightSavingsOffset is called,
  // before local_time_offset is used.
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  var cache = DST_offset_cache;
  if (cache.start <= time && time <= cache.end) {
    var dst_offset = cache.offset;
  } else {
    var dst_offset = DaylightSavingsOffset(time);
  }
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  ltc.key = time;
  return (ltc.val = time + local_time_offset + dst_offset);
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}

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function UTC(time) {
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  if (NUMBER_IS_NAN(time)) return time;
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  // 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();
  }
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  var tmp = time - local_time_offset;
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  return tmp - DaylightSavingsOffset(tmp);
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}
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// 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 $NaN;
  return TO_INTEGER(hour) * msPerHour
      + TO_INTEGER(min) * msPerMinute
      + TO_INTEGER(sec) * msPerSecond
      + TO_INTEGER(ms);
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}
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// ECMA 262 - 15.9.1.12
function TimeInYear(year) {
  return DaysInYear(year) * msPerDay;
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}
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var ymd_from_time_cache = [$NaN, $NaN, $NaN];
var ymd_from_time_cached_time = $NaN;

function YearFromTime(t) {
  if (t !== ymd_from_time_cached_time) {
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    if (!$isFinite(t)) {
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      return $NaN;
    }

    %DateYMDFromTime(t, ymd_from_time_cache);
    ymd_from_time_cached_time = t
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  }
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  return ymd_from_time_cache[0];
}

function MonthFromTime(t) {
  if (t !== ymd_from_time_cached_time) {
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    if (!$isFinite(t)) {
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      return $NaN;
    }
    %DateYMDFromTime(t, ymd_from_time_cache);
    ymd_from_time_cached_time = t
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  }
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  return ymd_from_time_cache[1];
}

function DateFromTime(t) {
  if (t !== ymd_from_time_cached_time) {
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    if (!$isFinite(t)) {
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      return $NaN;
    }

    %DateYMDFromTime(t, ymd_from_time_cache);
    ymd_from_time_cached_time = t
  }

  return ymd_from_time_cache[2];
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}
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// 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;

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  // 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);
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  if (year < kMinYear || year > kMaxYear ||
      month < kMinMonth || month > kMaxMonth ||
      date < kMinDate || date > kMaxDate) {
    return $NaN;
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  }

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  // Now we rely on year, month and date being SMIs.
  return %DateMakeDay(year, month, date);
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}
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// ECMA 262 - 15.9.1.13
function MakeDate(day, time) {
  if (!$isFinite(day)) return $NaN;
  if (!$isFinite(time)) return $NaN;
  return day * msPerDay + time;
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}
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// ECMA 262 - 15.9.1.14
function TimeClip(time) {
  if (!$isFinite(time)) return $NaN;
  if ($abs(time) > 8.64E15) return $NaN;
  return TO_INTEGER(time);
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}
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// 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
};


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%SetCode($Date, function(year, month, date, hours, minutes, seconds, ms) {
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  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);
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    } 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);
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        if (!NUMBER_IS_NAN(value)) {
          cache.time = value;
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          cache.year = YEAR_FROM_TIME(LocalTimeNoCheck(value));
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          cache.string = year;
        }
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      }

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    } else {
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      // According to ECMA 262, no hint should be given for this
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      // conversion. However, ToPrimitive defaults to STRING_HINT for
      // Date objects which will lose precision when the Date
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      // constructor is called with another Date object as its
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      // 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.
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      var time = ToPrimitive(year, NUMBER_HINT);
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      value = IS_STRING(time) ? DateParse(time) : TimeClip(ToNumber(time));
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    }
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  } else {
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    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;
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    year = (!NUMBER_IS_NAN(year) && 0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
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        ? 1900 + TO_INTEGER(year) : year;
    var day = MakeDay(year, month, date);
    var time = MakeTime(hours, minutes, seconds, ms);
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    value = TimeClip(UTC(MakeDate(day, time)));
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  }
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  %_SetValueOf(this, value);
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});


%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;
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}
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function DateString(time) {
  return WeekDays[WeekDay(time)] + ' '
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      + Months[MonthFromTime(time)] + ' '
      + TwoDigitString(DateFromTime(time)) + ' '
      + YearFromTime(time);
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}
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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)] + ', '
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      + LongMonths[MonthFromTime(time)] + ' '
      + TwoDigitString(DateFromTime(time)) + ', '
      + YearFromTime(time);
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}


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function TimeString(time) {
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  return TwoDigitString(HOUR_FROM_TIME(time)) + ':'
      + TwoDigitString(MIN_FROM_TIME(time)) + ':'
      + TwoDigitString(SEC_FROM_TIME(time));
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}
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function LocalTimezoneString(time) {
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  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;
  }

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  var timezoneOffset =
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      (DaylightSavingsOffset(time) + local_time_offset) / msPerMinute;
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  var sign = (timezoneOffset >= 0) ? 1 : -1;
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  var hours = FLOOR((sign * timezoneOffset)/60);
  var min   = FLOOR((sign * timezoneOffset)%60);
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  var gmt = ' GMT' + ((sign == 1) ? '+' : '-') +
      TwoDigitString(hours) + TwoDigitString(min);
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  return gmt + ' (' +  timezone + ')';
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}
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function DatePrintString(time) {
  return DateString(time) + ' ' + TimeString(time);
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}
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// -------------------------------------------------------------------

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// Reused output buffer. Used when parsing date strings.
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var parse_buffer = $Array(8);
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// ECMA 262 - 15.9.4.2
function DateParse(string) {
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  var arr = %DateParseString(ToString(string), parse_buffer);
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  if (IS_NULL(arr)) return $NaN;

  var day = MakeDay(arr[0], arr[1], arr[2]);
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  var time = MakeTime(arr[3], arr[4], arr[5], arr[6]);
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  var date = MakeDate(day, time);
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  if (IS_NULL(arr[7])) {
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    return TimeClip(UTC(date));
  } else {
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    return TimeClip(date - arr[7] * 1000);
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  }
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}
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// 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;
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  year = (!NUMBER_IS_NAN(year) && 0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
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      ? 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)));
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}
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// Mozilla-specific extension. Returns the number of milliseconds
// elapsed since 1 January 1970 00:00:00 UTC.
function DateNow() {
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  return %DateCurrentTime();
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}
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// ECMA 262 - 15.9.5.2
function DateToString() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return kInvalidDate;
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  var time_zone_string = LocalTimezoneString(t);  // May update local offset.
  return DatePrintString(LocalTimeNoCheck(t)) + time_zone_string;
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}
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// ECMA 262 - 15.9.5.3
function DateToDateString() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return kInvalidDate;
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  return DateString(LocalTimeNoCheck(t));
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}
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// ECMA 262 - 15.9.5.4
function DateToTimeString() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return kInvalidDate;
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  var time_zone_string = LocalTimezoneString(t);  // May update local offset.
  return TimeString(LocalTimeNoCheck(t)) + time_zone_string;
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}


// ECMA 262 - 15.9.5.5
function DateToLocaleString() {
  return DateToString.call(this);
}


// ECMA 262 - 15.9.5.6
function DateToLocaleDateString() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return kInvalidDate;
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  return LongDateString(LocalTimeNoCheck(t));
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}
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// ECMA 262 - 15.9.5.7
function DateToLocaleTimeString() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return kInvalidDate;
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  var lt = LocalTimeNoCheck(t);
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  return TimeString(lt);
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}


// ECMA 262 - 15.9.5.8
function DateValueOf() {
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  return DATE_VALUE(this);
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}
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// ECMA 262 - 15.9.5.9
function DateGetTime() {
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  return DATE_VALUE(this);
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}


// ECMA 262 - 15.9.5.10
function DateGetFullYear() {
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  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));
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}
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// ECMA 262 - 15.9.5.11
function DateGetUTCFullYear() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return YEAR_FROM_TIME(t);
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}
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// ECMA 262 - 15.9.5.12
function DateGetMonth() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return MONTH_FROM_TIME(LocalTimeNoCheck(t));
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}
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// ECMA 262 - 15.9.5.13
function DateGetUTCMonth() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return MONTH_FROM_TIME(t);
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}
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// ECMA 262 - 15.9.5.14
function DateGetDate() {
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  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return DATE_FROM_TIME(LocalTimeNoCheck(t));
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}
679 680 681 682


// ECMA 262 - 15.9.5.15
function DateGetUTCDate() {
683 684
  var t = DATE_VALUE(this);
  return NAN_OR_DATE_FROM_TIME(t);
685
}
686 687 688 689


// ECMA 262 - 15.9.5.16
function DateGetDay() {
690 691
  var t = %_ValueOf(this);
  if (NUMBER_IS_NAN(t)) return t;
692
  return WeekDay(LocalTimeNoCheck(t));
693
}
694 695 696 697


// ECMA 262 - 15.9.5.17
function DateGetUTCDay() {
698 699
  var t = %_ValueOf(this);
  if (NUMBER_IS_NAN(t)) return t;
700
  return WeekDay(t);
701
}
702 703 704 705


// ECMA 262 - 15.9.5.18
function DateGetHours() {
706 707 708
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return HOUR_FROM_TIME(LocalTimeNoCheck(t));
709
}
710 711 712 713


// ECMA 262 - 15.9.5.19
function DateGetUTCHours() {
714 715 716
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return HOUR_FROM_TIME(t);
717
}
718 719 720 721


// ECMA 262 - 15.9.5.20
function DateGetMinutes() {
722 723 724
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return MIN_FROM_TIME(LocalTimeNoCheck(t));
725
}
726 727 728 729


// ECMA 262 - 15.9.5.21
function DateGetUTCMinutes() {
730 731
  var t = DATE_VALUE(this);
  return NAN_OR_MIN_FROM_TIME(t);
732
}
733 734 735 736


// ECMA 262 - 15.9.5.22
function DateGetSeconds() {
737 738 739
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return SEC_FROM_TIME(LocalTimeNoCheck(t));
740
}
741 742 743 744


// ECMA 262 - 15.9.5.23
function DateGetUTCSeconds() {
745 746
  var t = DATE_VALUE(this);
  return NAN_OR_SEC_FROM_TIME(t);
747
}
748 749 750 751


// ECMA 262 - 15.9.5.24
function DateGetMilliseconds() {
752 753 754
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
  return MS_FROM_TIME(LocalTimeNoCheck(t));
755
}
756 757 758 759


// ECMA 262 - 15.9.5.25
function DateGetUTCMilliseconds() {
760 761
  var t = DATE_VALUE(this);
  return NAN_OR_MS_FROM_TIME(t);
762
}
763 764 765 766


// ECMA 262 - 15.9.5.26
function DateGetTimezoneOffset() {
767 768
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return t;
769
  return (t - LocalTimeNoCheck(t)) / msPerMinute;
770
}
771 772 773 774


// ECMA 262 - 15.9.5.27
function DateSetTime(ms) {
775
  if (!IS_DATE(this)) ThrowDateTypeError();
776
  return %_SetValueOf(this, TimeClip(ToNumber(ms)));
777
}
778 779 780 781


// ECMA 262 - 15.9.5.28
function DateSetMilliseconds(ms) {
782
  var t = LocalTime(DATE_VALUE(this));
783
  ms = ToNumber(ms);
784 785
  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))));
786
}
787 788 789 790


// ECMA 262 - 15.9.5.29
function DateSetUTCMilliseconds(ms) {
791
  var t = DATE_VALUE(this);
792
  ms = ToNumber(ms);
793 794
  var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), SEC_FROM_TIME(t), ms);
  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
795
}
796 797 798 799


// ECMA 262 - 15.9.5.30
function DateSetSeconds(sec, ms) {
800
  var t = LocalTime(DATE_VALUE(this));
801
  sec = ToNumber(sec);
802
  ms = %_ArgumentsLength() < 2 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
803 804
  var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), sec, ms);
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
805
}
806 807 808 809


// ECMA 262 - 15.9.5.31
function DateSetUTCSeconds(sec, ms) {
810
  var t = DATE_VALUE(this);
811
  sec = ToNumber(sec);
812
  ms = %_ArgumentsLength() < 2 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
813 814
  var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), sec, ms);
  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
815
}
816 817 818 819


// ECMA 262 - 15.9.5.33
function DateSetMinutes(min, sec, ms) {
820
  var t = LocalTime(DATE_VALUE(this));
821 822
  min = ToNumber(min);
  var argc = %_ArgumentsLength();
823 824
  sec = argc < 2 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
  ms = argc < 3 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
825 826
  var time = MakeTime(HOUR_FROM_TIME(t), min, sec, ms);
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
827
}
828 829 830 831


// ECMA 262 - 15.9.5.34
function DateSetUTCMinutes(min, sec, ms) {
832
  var t = DATE_VALUE(this);
833 834
  min = ToNumber(min);
  var argc = %_ArgumentsLength();
835 836
  sec = argc < 2 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
  ms = argc < 3 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
837 838
  var time = MakeTime(HOUR_FROM_TIME(t), min, sec, ms);
  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
839
}
840 841 842 843


// ECMA 262 - 15.9.5.35
function DateSetHours(hour, min, sec, ms) {
844
  var t = LocalTime(DATE_VALUE(this));
845 846
  hour = ToNumber(hour);
  var argc = %_ArgumentsLength();
847 848 849
  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);
850
  var time = MakeTime(hour, min, sec, ms);
851
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
852
}
853 854 855 856


// ECMA 262 - 15.9.5.34
function DateSetUTCHours(hour, min, sec, ms) {
857
  var t = DATE_VALUE(this);
858 859
  hour = ToNumber(hour);
  var argc = %_ArgumentsLength();
860 861 862
  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);
863
  var time = MakeTime(hour, min, sec, ms);
864
  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
865
}
866 867 868 869


// ECMA 262 - 15.9.5.36
function DateSetDate(date) {
870
  var t = LocalTime(DATE_VALUE(this));
871
  date = ToNumber(date);
872
  var day = MakeDay(YEAR_FROM_TIME(t), MONTH_FROM_TIME(t), date);
873
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
874
}
875 876 877 878


// ECMA 262 - 15.9.5.37
function DateSetUTCDate(date) {
879
  var t = DATE_VALUE(this);
880
  date = ToNumber(date);
881
  var day = MakeDay(YEAR_FROM_TIME(t), MONTH_FROM_TIME(t), date);
882
  return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
883
}
884 885 886 887


// ECMA 262 - 15.9.5.38
function DateSetMonth(month, date) {
888
  var t = LocalTime(DATE_VALUE(this));
889
  month = ToNumber(month);
890
  date = %_ArgumentsLength() < 2 ? NAN_OR_DATE_FROM_TIME(t) : ToNumber(date);
891
  var day = MakeDay(YEAR_FROM_TIME(t), month, date);
892
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
893
}
894 895 896 897


// ECMA 262 - 15.9.5.39
function DateSetUTCMonth(month, date) {
898
  var t = DATE_VALUE(this);
899
  month = ToNumber(month);
900
  date = %_ArgumentsLength() < 2 ? NAN_OR_DATE_FROM_TIME(t) : ToNumber(date);
901
  var day = MakeDay(YEAR_FROM_TIME(t), month, date);
902
  return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
903
}
904 905 906 907


// ECMA 262 - 15.9.5.40
function DateSetFullYear(year, month, date) {
908 909
  var t = DATE_VALUE(this);
  t = NUMBER_IS_NAN(t) ? 0 : LocalTimeNoCheck(t);
910 911
  year = ToNumber(year);
  var argc = %_ArgumentsLength();
912 913
  month = argc < 2 ? MONTH_FROM_TIME(t) : ToNumber(month);
  date = argc < 3 ? DATE_FROM_TIME(t) : ToNumber(date);
914 915
  var day = MakeDay(year, month, date);
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
916
}
917 918 919 920


// ECMA 262 - 15.9.5.41
function DateSetUTCFullYear(year, month, date) {
921 922
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) t = 0;
923 924
  var argc = %_ArgumentsLength();
  year = ToNumber(year);
925 926
  month = argc < 2 ? MONTH_FROM_TIME(t) : ToNumber(month);
  date = argc < 3 ? DATE_FROM_TIME(t) : ToNumber(date);
927 928
  var day = MakeDay(year, month, date);
  return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
929
}
930 931 932 933


// ECMA 262 - 15.9.5.42
function DateToUTCString() {
934 935
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return kInvalidDate;
936 937
  // Return UTC string of the form: Sat, 31 Jan 1970 23:00:00 GMT
  return WeekDays[WeekDay(t)] + ', '
938 939 940
      + TwoDigitString(DATE_FROM_TIME(t)) + ' '
      + Months[MONTH_FROM_TIME(t)] + ' '
      + YEAR_FROM_TIME(t) + ' '
941
      + TimeString(t) + ' GMT';
942
}
943 944 945 946


// ECMA 262 - B.2.4
function DateGetYear() {
947 948
  var t = DATE_VALUE(this);
  if (NUMBER_IS_NAN(t)) return $NaN;
949
  return YEAR_FROM_TIME(LocalTimeNoCheck(t)) - 1900;
950
}
951 952 953 954


// ECMA 262 - B.2.5
function DateSetYear(year) {
955 956
  var t = LocalTime(DATE_VALUE(this));
  if (NUMBER_IS_NAN(t)) t = 0;
957
  year = ToNumber(year);
958
  if (NUMBER_IS_NAN(year)) return %_SetValueOf(this, $NaN);
959 960
  year = (0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
      ? 1900 + TO_INTEGER(year) : year;
961
  var day = MakeDay(year, MONTH_FROM_TIME(t), DATE_FROM_TIME(t));
962
  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
963 964 965 966 967 968 969 970 971 972 973 974 975
}


// 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);
}
976 977


978 979 980
function PadInt(n, digits) {
  if (digits == 1) return n;
  return n < MathPow(10, digits - 1) ? '0' + PadInt(n, digits - 1) : n;
981 982 983 984
}


function DateToISOString() {
985 986 987 988 989 990
  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) +
991 992 993 994 995 996 997 998 999
      'Z';
}


function DateToJSON(key) {
  return CheckJSONPrimitive(this.toISOString());
}


1000 1001 1002 1003
// -------------------------------------------------------------------

function SetupDate() {
  // Setup non-enumerable properties of the Date object itself.
1004 1005 1006 1007 1008 1009 1010
  InstallFunctions($Date, DONT_ENUM, $Array(
    "UTC", DateUTC,
    "parse", DateParse,
    "now", DateNow
  ));

  // Setup non-enumerable constructor property of the Date prototype object.
1011
  %SetProperty($Date.prototype, "constructor", $Date, DONT_ENUM);
1012

1013 1014
  // Setup non-enumerable functions of the Date prototype object and
  // set their names.
1015
  InstallFunctionsOnHiddenPrototype($Date.prototype, DONT_ENUM, $Array(
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
    "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,
1059 1060 1061
    "setYear", DateSetYear,
    "toISOString", DateToISOString,
    "toJSON", DateToJSON
1062 1063
  ));
}
1064 1065

SetupDate();