ios - Sorting array based on date and time with two dictionary keys -

i trying sort array based on date , time , can sort array based on date both time coming value in dictionary.

so date comes string in format "yyyy-mm-dd" , time comes in string in format "hh:mm"

time value comes in key "starts" string '"hh:mm"' format.

i know somehow need combine 2 strings 'yyyy-mm-dd hh:mm' how?

-(nsmutablearray *)sortarraybasedondate:(nsmutablearray *)arraytosort {     nsdateformatter *formatter = [[nsdateformatter alloc] init];     [formatter setdateformat:@"yyyy-mm-dd"];      nscomparator comparedates = ^(id string1, id string2)     {         nsdate *date1 = [formatter datefromstring:string1];         nsdate *date2 = [formatter datefromstring:string2];          return [date1 compare:date2];     };       nssortdescriptor * sortdesc1 = [[nssortdescriptor alloc] initwithkey:@"start_date" ascending:yes comparator:comparedates];     [arraytosort sortusingdescriptors:[nsarray arraywithobjects:sortdesc1, nil]];       return arraytosort; } 

any idea how can solve problem?

you need sort times well, why sortusingdescriptors: takes array.

-(nsmutablearray *)sortarraybasedondate:(nsmutablearray *)arraytosort {     nsdateformatter *fmtdate = [[nsdateformatter alloc] init];     [fmtdate setdateformat:@"yyyy-mm-dd"];      nsdateformatter *fmttime = [[nsdateformatter alloc] init];     [fmttime setdateformat:@"hh:mm"];      nscomparator comparedates = ^(id string1, id string2)     {         nsdate *date1 = [fmtdate datefromstring:string1];         nsdate *date2 = [fmtdate datefromstring:string2];          return [date1 compare:date2];     };      nscomparator comparetimes = ^(id string1, id string2)     {         nsdate *time1 = [fmttime datefromstring:string1];         nsdate *time2 = [fmttime datefromstring:string2];          return [time1 compare:time2];     };      nssortdescriptor * sortdesc1 = [[nssortdescriptor alloc] initwithkey:@"start_date" ascending:yes comparator:comparedates];     nssortdescriptor * sortdesc2 = [nssortdescriptor sortdescriptorwithkey:@"starts" ascending:yes comparator:comparetimes];     [arraytosort sortusingdescriptors:@[sortdesc1, sortdesc2]];      return arraytosort; }