nsdate - Compare time in string and subtract 10 min from that in iphone? -


i have array of time string "10:10:12","12:10:34","05:23:11" this. want calculate less(min) time form array i.e "05:23:11" , subtract 10 min that. , save result in same format. please if 1 knows how me. appreciate him/her. thank in advance.

if array dates big u can llike this:

    nsarray * arraywithtime = [nsarray array];     nsdateformatter *dateformatter = [[nsdateformatter alloc] init];    [dateformatter setdateformat:@"hh:mm:ss"];   nssortdescriptor *d = [[nssortdescriptor alloc] initwithkey:nil ascending:yes comparator:^nscomparisonresult(id obj1,id obj2){    nsdate *date1 = [dateformatter datefromstring:obj1]; nsdate *date2 = [dateformatter datefromstring:obj2];  return [date1 compare:date2];} ];  nsarray * comparators = [nsarray arraywithobject:d]; nsarray * final = [arraywithtime sortedarrayusingdescriptors:comparators];

then take first item in final array , subtract 10 min


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