IOS calculates the number of days of a month to calculate the day of the week

//number of days in a certain month-(Nsinteger) Daycount: (nsinteger) years{Nsinteger Count=0;  for(inti =1; I <= A; i++) {        if(2==i) {if((Years%4==0&& years% -!=0) || Years% -==0)//is a leap year{Count= in; }            Else{Count= -; }                    }Else if(4= = I | |6= = I | |9= = I | | One==i) {Count= -; }Else{Count= to; }    }    returncount;}

//one day of the week-(NSString *) Whichweek: (NSString *) datestr{Nscalendar*calendar =[Nscalendar Currentcalendar]; NSDateFormatter*inputformatter =[[NSDateFormatter alloc] init]; [Inputformatter Setdateformat:@"YYYY-MM-DD"]; NSDate* Inputdate =[Inputformatter Datefromstring:datestr]; Nsdatecomponents*datecomps =[Calendar Components:nscalendarunitweekday fromdate:inputdate]; Nsinteger WeekDay=Datecomps.weekday; Switch(WeekDay) { Case 1:            return @"Sunday";  Break;  Case 2:            return @"Monday";  Break;  Case 3:            return @"Tuesday";  Break;  Case 4:            return @"Wednesday";  Break;  Case 5:            return @"Thursday";  Break;  Case 6:            return @"Friday";  Break;  Case 7:            return @"Saturday";  Break; default:            return @"";  Break; }}