I am trying to get the week number of current date / specific date falls in. Any suggestions for logic building will be helpful.
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Have a look on that maybe : http://stackoverflow.com/questions/9045868/javascript-date-getweek – R. Foubert Jul 11 '16 at 13:36
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May check out [moment](http://momentjs.com/) if you want to work with dates in JS. – Lux Jul 11 '16 at 13:36
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Do you want to get an ISO standard week number, or some localized week number? – Teemu Jul 11 '16 at 13:37
2 Answers
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function getWeekNumber(thisDate) {
var dt = new Date(thisDate);
var thisDay = dt.getDate();
var newDate = dt;
newDate.setDate(1); // first day of month
var digit = newDate.getDay();
var Q = (thisDay + digit) / 7;
var R = (thisDay + digit) % 7;
if (R !== 0) return Math.ceil(Q);
else return Q;}
getWeekNumber("07/31/2016");
Swati Jangale
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You should not parse strings using the Date constructor (or Date.parse, they are equivalent for parsing). It does not make sense to use Date methods to create a string to then parse to another Date (e.g. to get the first of the month), just use Date methods directly: `newDate.setDate(1)`. – RobG Jul 12 '16 at 00:19
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let _ = new Date,
__ = ~~((new Date(_.getFullYear(), 0, 0) - _) / 36e5 * 24),
___ = (__ - __ % 7) / 7;
zhibirc
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3Care for additional explanation (like why you're using underscores instead of names)? – dakab Jul 11 '16 at 14:53