How do I find the number of given days between two dates in Javascript? -


this question has answer here:

i have 2 arbitrary dates, lets april 1st 2012 , january 15th 2013. want calculate number of sundays, mondays, tuesdays, wednesdays, thursdays, fridays, , saturdays between 2 dates.

is there surefire-quick way without crippling users cpu/browser?

thanks

update

the premise of is, have defined average number of events given day of week. need calculate number of events happen in time period, partials (like 1/2 day of sunday half number of events added total)

ok, here possible untested solution

date1 = new date("2012-02-10"); date2 = new date("2012-03-10");  daysinbetween = (date2.gettime() - date1.gettime())/1000/3600/24;  dayoftheweek1 = date1.getday();  weeks = parseint(daysinbetween/7, 10); extradays = daysinbetween%7;

you have weeks + 1 days of dayofweek1 ... dayofweek1 + (6 - extradays)

you have weeks + 1 + extradays days of dayofweek1 + (6 - extradays) ... dayofweek1 + 6

please take acount if dayofweek1 === 6 assuming dayofweek1 + 1 === 0.

edit:

a little bit more of code:

var days = {}; var dayoftheweekend = dayoftheweek1 + 6 - extradays; // no imagination names... if (dayoftheweekend < 6) {   if (0 >= dayoftheweek1 && 0 <= dayoftheweekend) {     days.sunday = weeks + 1;   } else {     days.sunday = weeks + 1 + extradays;   }   // etc other days, loog instead of 0 better. } else {   // have go school! i'll edit later.   // idea have take dayoftheweekend 0-6 range   // , check if after dayofweek1 or before dayoftheweekend, days.sunday=weeks+1. }

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