visual studio - format subtract dates result to "hh:mm:ss" -


i need format subtract 2 long date time result "hh.mm.ss" 

open date           closed date           subtracted 01/01/2012 16:04    04/01/2012 17:07      3.01:02:58 02/01/2012 08:52    02/01/2012 17:03        08:10:27

using 

closeddate.subtract(opendate)

return result in format d.hh:mm:ss

and using

datediff("h", opendate, closedate)

return hours (no minutes or seconds)

also tried 

closeddate.subtract(opendate).tostring("hh:mm:ss")

not working

as many microsoft forums answered there no way

so used 

datediff("s", opendate, closedate)

and passed result helper function return calculated time in format hh:mm:ss


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