jquery - How do I calculate number of given weekday between range using Moment JS? -

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how find out how many of given weekday (ex: tuesdays) in date range using moment js , jquery?

i can find number of days using difference: http://momentjs.com/docs/#/displaying/difference/

and know start , end date, feel should possible?

example: how many tuesdays there between march 1st , march 25th?

i came following function seems work given handful of test cases tried:

function weekdaysbetween(d1, d2, isoweekday) {     // ensure have valid moment instances     d1 = moment(d1);     d2 = moment(d2);     // figure out how many days advance next     // specified weekday (might 0 if d1      // specified weekday).     var daystoadd = ((7 + isoweekday) - d1.isoweekday()) % 7;     var nexttuesday = d1.clone().add(daystoadd, 'days');     // if passed end date, there must not     // of day in given period.     if (nexttuesday.isafter(d2)) {         return 0;     }     // otherwise, return whole number of weeks     // difference plus 1 day advanced     var weeksbetween = d2.diff(nexttuesday, 'weeks');     return weeksbetween + 1; }

you pass in isoweekday value day trying count. e.g. tuesday, pass in 2.

sample invocation:

var d1 = moment('2015-03-01'); var d2 = moment('2015-03-25');  console.log('result:', weekdaysbetween(d1, d2, 2)); // => result: 4

wolfram alpha gives same result.

you should add own tests before trusting completely, though.


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