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JS: Simplify Date.getStdTimezoneOffset() 

refs #3607
This commit is contained in:
Eric Lippmann 2018-11-15 09:17:42 +01:00
parent d9b337a213
commit fbc7598a6b
1 changed files with 3 additions and 17 deletions
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20
public/js/icinga/timezone.js
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@ -10,25 +10,11 @@
* @returns {Number} * @returns {Number}
*/ */
Date.prototype.getStdTimezoneOffset = function() { Date.prototype.getStdTimezoneOffset = function() {
if (Date.maxTimezoneOffset !== undefined) {
return Date.maxTimezoneOffset;
}
var year = new Date().getFullYear(); var year = new Date().getFullYear();
var previousOffset; var offsetInJanuary = new Date(year, 0, 2).getTimezoneOffset();
var offsetInJune = new Date(year, 5, 2).getTimezoneOffset();
for (var i=0; i<12; i++) { return Math.max(offsetInJanuary, offsetInJune);
var d = new Date(year, i, 1);
if (previousOffset !== undefined) {
previousOffset = Math.max(previousOffset, d.getTimezoneOffset());
} else {
previousOffset = d.getTimezoneOffset();
}
}
Date.maxTimezoneOffset = previousOffset;
return Date.maxTimezoneOffset;
}; };
/** /**