ios - time comparison not working. What could be wrong? -

i worked on code perform pause notifications through sleep time, there missing can't quite figure out. be?

my .m code:

- (ibaction)save:(id)sender {  nsdateformatter *dateformatter = [[nsdateformatter alloc]init]; dateformatter.timezone=[nstimezone defaulttimezone]; dateformatter.timestyle=nsdateformattershortstyle; dateformatter.datestyle=nsdateformattershortstyle; nsstring *datetimestring=[dateformatter stringfromdate:_starttime.date]; nslog(@"start time %@",datetimestring);   nsdateformatter *dateformatter2 = [[nsdateformatter alloc]init]; dateformatter2.timezone=[nstimezone defaulttimezone]; dateformatter2.timestyle=nsdateformattershortstyle; dateformatter2.datestyle=nsdateformattershortstyle; nsstring *datetimestring2=[dateformatter2 stringfromdate:_endtime.date]; nslog(@"end time %@",datetimestring2);    if ([[nsdate date] isequaltodate:_starttime.date]) {     nslog(@"currentdate equal starttime");      [[uiapplication sharedapplication] cancelalllocalnotifications];      nslog(@"sleep time silent started , notification cancelled");  }  if ([[nsdate date] isequaltodate:_endtime.date]) {     nslog(@"currentdate equal endtime");      [self pickerselectedrow];      nslog(@"time wake , notification rescheduled"); }   } 

when click on save button receive out output means it's working fine, however, when time comes don't output saying notification has been cancelled or rescheduled, means it's not working!!!

output:

2013-05-03 03:04:57.481 xxx[10846:c07] start time 5/3/13, 3:06 2013-05-03 03:04:57.482 xxx[10846:c07] end time 5/3/13, 3:07 

what missing?

also, work in background?

you need different compare. perhaps this: (all of following should in .m file)

- (ibaction)save:(id)sender {      nsdateformatter *dateformatter = [[nsdateformatter alloc]init];     dateformatter.timezone=[nstimezone defaulttimezone];     dateformatter.timestyle=nsdateformattershortstyle;     dateformatter.datestyle=nsdateformattershortstyle;     nsstring *datetimestring=[dateformatter stringfromdate:_starttime];     nslog(@"start time %@",datetimestring);      nsdateformatter *dateformatter2 = [[nsdateformatter alloc]init];     dateformatter2.timezone=[nstimezone defaulttimezone];     dateformatter2.timestyle=nsdateformattershortstyle;     dateformatter2.datestyle=nsdateformattershortstyle;     nsstring *datetimestring2=[dateformatter2 stringfromdate:_endtime];     nslog(@"end time %@",datetimestring2);      if ([self date:[nsdate date] compareme:_starttime]) {         nslog(@"currentdate equal starttime");          [[uiapplication sharedapplication] cancelalllocalnotifications];          nslog(@"sleep time silent started , notification cancelled");      }      if ([self date:[nsdate date] compareme:_endtime]) {         nslog(@"currentdate equal endtime");          [self pickerselectedrow];          nslog(@"time wake , notification rescheduled");     } }  -(bool)date:(nsdate *)date1 compareme:(nsdate *)date2 {     nscalendar *calendar = [nscalendar currentcalendar];     nsdatecomponents *date1componenets = [calendar components:nsdaycalendarunit|nsmonthcalendarunit|nsyearcalendarunit fromdate:date1];     nsdatecomponents *date2componenets = [calendar components:nsdaycalendarunit|nsmonthcalendarunit|nsyearcalendarunit fromdate:date2];      return [date1componenets year] == [date2componenets year]; } 

if going compare dates lot, put comparing function in different file, such nsdate category, more complicated think need.