ios - in what object OR cons type should I store countDownDuration data? -

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i have model class sub-class of nsmanagedobject, class created .model entity.

whenever click "save" method want give model class count down time, each object of class have it's countdown time , can fire each object...

i'm beginner helpful if can give me guidance in type of object should store count down time selected?

i know how log it:

- (ibaction)save:(id)sender {      nsdateformatter *formatter = [[nsdateformatter alloc] init];         [formatter setdateformat:@"hh:mm"];         nslog(@"%@", [formatter stringfromdate:[datepicker date]]); }

thanks


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