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Count certain days of the week between two dates
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// https://stackoverflow.com/questions/25562173/calculate-number-of-specific-weekdays-between-dates | |
// days is an array of weekdays: 0 is Sunday, ..., 6 is Saturday | |
function countCertainDays( days, d0, d1 ) { | |
var ndays = 1 + Math.round((d1-d0)/(24*3600*1000)); | |
var sum = function(a,b) { | |
return a + Math.floor( ( ndays + (d0.getDay()+6-b) % 7 ) / 7 ); }; | |
return days.reduce(sum,0); | |
} | |
// Feb 5 2018 - Nov 18 2018mon | |
var startDate = new Date(2018, 2, 5) | |
var endDate = new Date(2018, 11, 18) | |
var mondays = countCertainDays([1], startDate, endDate) | |
var tuesdays = countCertainDays([2], startDate, endDate) | |
var wednsdays = countCertainDays([3], startDate, endDate) | |
var thursdays = countCertainDays([4], startDate, endDate) | |
var fridays = countCertainDays([5], startDate, endDate) | |
var saturdays = countCertainDays([6], startDate, endDate) | |
var sundays = countCertainDays([7], startDate, endDate) | |
var daysOfWeekCountMondayToSunday = [mondays, tuesdays, wednsdays, thursdays, fridays, saturdays, sundays] | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,1)) // 1 | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,2)) // 1 | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,3)) // 2 | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,4)) // 2 | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,5)) // 3 | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,6)) // 3 | |
countCertainDays([1,3,5],new Date(2014,8,1),new Date(2014,8,7)) // 3 |
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