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- // Hacking javascript to get the week number of a selected date
- Date.prototype.getWeek = function() {
- var date = new Date(this.getTime());
- date.setHours(0, 0, 0, 0);
- // Thursday in current week decides the year.
- date.setDate(date.getDate() + 3 - (date.getDay() + 7) % 7);
- // January 4 is always in week 1.
- var week1 = new Date(date.getFullYear(), 0, 4);
- // Adjust to Thursday in week 1 and count number of weeks from date to week1.
- return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000
- - 3 + (week1.getDay() + 6) % 7) / 7);
- };
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