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JustinMorgan/weekNumber.js

Last active October 20, 2015 21:50
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Which number week of the year is it?
Raw
weekNumber.js
function weekNumber(date) {
var currYear = date.getFullYear();
var jan1 = new Date(currYear,0,1);
return Math.ceil((((date - jan1) / 86400000) + jan1.getDay() + 1)/7);
}
function weekNumberUTC(date) {
var currYear = date.getUTCFullYear();
var jan1 = new Date(currYear,0,1);
return Math.ceil((((date - jan1) / 86400000) + jan1.getUTCDay() + 1)/7);
}
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