| @@ -1694,15 +1694,27 Date.prototype.getDayOfYear = function() { | |||
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1694 | 1694 | return Math.floor(time / Date.DAY); |
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1695 | 1695 | }; |
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1696 | 1696 | |
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1697 |
/** Returns the number of the week in year, as defined in ISO 8601. |
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1697 | /** Returns the number of the week in year, as defined in ISO 8601. | |
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1698 | This function is only correct if `this` is the first day of the week. */ | |
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1698 | 1699 | Date.prototype.getWeekNumber = function() { |
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1699 |
var d = new Date(this.getFullYear(), this.getMonth(), this.getDate() |
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1700 | var DoW = d.getDay(); | |
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1701 | d.setDate(d.getDate() - (DoW + 6) % 7 + 3); // Nearest Thu | |
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1702 | var ms = d.valueOf(); // GMT | |
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1703 | d.setMonth(0); | |
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1704 | d.setDate(4); // Thu in Week 1 | |
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1705 | return Math.round((ms - d.valueOf()) / (7 * 864e5)) + 1; | |
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1700 | var d = new Date(this.getFullYear(), this.getMonth(), this.getDate()); | |
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1701 | var days = 1000*60*60*24; // one day in milliseconds | |
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1702 | ||
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1703 | // get the thursday of the current week | |
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1704 | var this_thursday = new Date( | |
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1705 | d.valueOf() // selected date | |
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1706 | - (d.getDay() % 7)*days // previous sunday | |
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1707 | + 4*days // + 4 days | |
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1708 | ).valueOf(); | |
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1709 | ||
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1710 | // the thursday in the first week of the year | |
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1711 | var first_thursday = new Date( | |
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1712 | new Date(this.getFullYear(), 0, 4).valueOf() // January 4 is in the first week by definition | |
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1713 | - (d.getDay() % 7)*days // previous sunday | |
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1714 | + 4*days // + 4 days | |
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1715 | ).valueOf(); | |
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1716 | ||
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1717 | return Math.round((this_thursday - first_thursday) / (7*days)) + 1; | |
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1706 | 1718 | }; |
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1707 | 1719 | |
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1708 | 1720 | /** Checks date and time equality */ |
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