NSDate/ NSTimeZone Help

i trying set email picker have subject of message "tonight", "tomorrow","today", or defaults "later"

have far. how can tonight , today show?

code:

                int timezonedifference;         nsdate *tomorrowsdate = [nsdate datetomorrow];          nstimezone* timezone = [nstimezone systemtimezone];          timezonedifference = [timezone secondsfromgmt];          nsdate *startdate = [ _event.startdate datebyaddingtimeinterval:timezonedifference];          if ([startdate isequaltodateignoringtime:tomorrowsdate])           {              nslog(@"title tomorrow");              [controller setsubject:[nsstring stringwithformat:@"tomorrow - %@", _event.name]];          }          else if (startdate.hour > timezonedifference) {              nslog(@"title today");              [controller setsubject:[nsstring stringwithformat:@"today - %@", _event.name]];          }          else if (startdate.hour <= timezonedifference) {              nslog(@"title tonight");              [controller setsubject:[nsstring stringwithformat:@"tonight - %@", _event.name]];          }          else {              nslog(@"title later");              [controller setsubject:[nsstring stringwithformat:@" - %@", _event.name]];          }  

 

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