javascript - how to get the week number from two start and end custom dates in asp.net/c# -

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for example have start date = 05-09-2016(dd-mm-yyyy) , end date = 09-01-2017

and want have week starting 5th sep called week 1 , last week 18

edit: shall giving date , these 2 start , end dates should give me week number. eg. when enter 09-11-2016 should give me week 6

and have acheive without doing hardcoding.

uptil have written 

datetime date = new datetime(2016, 09, 05   );         datetimeformatinfo dfi = datetimeformatinfo.currentinfo;         calendar cal = dfi.calendar;          console.writeline( (cal.getweekofyear(date, dfi.calendarweekrule, dfi.firstdayofweek))-36);

but doesn't work when new year starts .. advice please? tell if can acheive similar using javascript if not acheivable in asp.net/ c#

it looks need calculate number of weeks between 2 dates, please give try below:

this prints 18 expected.

    datetime date1 = new datetime(2016, 09, 05);     datetime date2 = new datetime(2017, 01, 09);     var weeks = math.ceil((date2 - date1).totaldays / 7);      console.writeline(weeks);

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