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Found more of Sputnik's date helper funcs.

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This commit is contained in:
David Fugate 2011-09-21 15:40:29 -07:00
parent 0b0736cbee
commit 17c67df352
1 changed files with 64 additions and 16 deletions
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80
test/harness/Date_library.js
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@ -1,6 +1,69 @@
// Copyright 2009 the Sputnik authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
//the following values are normally generated by the sputnik.py driver
var $LocalTZ,
$DST_start_month,
$DST_start_sunday,
$DST_start_hour,
$DST_start_minutes,
$DST_end_month,
$DST_end_sunday,
$DST_end_hour,
$DST_end_minutes;
(function () {
/**
* Finds the first date, starting from |start|, where |predicate|
* holds.
*/
var findNearestDateBefore = function(start, predicate) {
var current = start;
var month = 1000 * 60 * 60 * 24 * 30;
for (var step = month; step > 0; step = Math.floor(step / 3)) {
if (!predicate(current)) {
while (!predicate(current))
current = new Date(current.getTime() + step);
current = new Date(current.getTime() - step);
}
}
while (!predicate(current)) {
current = new Date(current.getTime() + 1);
}
return current;
}
var juneDate = new Date(2000, 6, 20, 0, 0, 0, 0);
var decemberDate = new Date(2000, 12, 20, 0, 0, 0, 0);
var juneOffset = juneDate.getTimezoneOffset();
var decemberOffset = decemberDate.getTimezoneOffset();
var isSouthernHemisphere = (juneOffset > decemberOffset);
var winterTime = isSouthernHemisphere ? juneDate : decemberDate;
var summerTime = isSouthernHemisphere ? decemberDate : juneDate;
$LocalTZ = new Date().getTimezoneOffset() / -60;
var dstStart = findNearestDateBefore(winterTime, function (date) {
return date.getTimezoneOffset() == summerTime.getTimezoneOffset();
});
$DST_start_month = dstStart.getMonth();
$DST_start_sunday = dstStart.getDate() > 15 ? '"last"' : '"first"';
$DST_start_hour = dstStart.getHours();
$DST_start_minutes = dstStart.getMinutes();
var dstEnd = findNearestDateBefore(summerTime, function (date) {
return date.getTimezoneOffset() == winterTime.getTimezoneOffset();
});
$DST_end_month = dstEnd.getMonth();
$DST_end_sunday = dstEnd.getDate() > 15 ? '"last"' : '"first"';
$DST_end_hour = dstEnd.getHours();
$DST_end_minutes = dstEnd.getMinutes();
return;
})();
//15.9.1.2 Day Number and Time within Day
function Day(t) {
return Math.floor(t/msPerDay);
@ -323,19 +386,4 @@ function ConstructDate(year, month, date, hours, minutes, seconds, ms){
var r11 = MakeDate(r9, r10);
return TimeClip(UTC(r11));
}
//the following values are normally generated by the sputnik.py driver
// for now, we'll just use 0 for everything
/*
var $LocalTZ=-8;
var $DST_start_month=2;
var $DST_start_sunday='first';
var $DST_start_hour=2;
var $DST_start_minutes=0;
var $DST_end_month=10;
var $DST_end_sunday='first';
var $DST_end_hour=2;
var $DST_end_minutes=0;
*/
}