iOS: getting weekOfMonth from date issue

Question

there is a little issue about getting WeekOfMonth from date. This is a sample code.

NSDateFormatter *dateformate=[[NSDateFormatter alloc]init];
[dateformate setDateFormat:@"dd/MM/yyyy"]; // Date formater

NSDate *dateTest1 = [dateformate dateFromString:@"25/07/2016"]; //Week no: 5
NSDate *dateTest2 = [dateformate dateFromString:@"01/08/2016"]; //Week no: 1
NSDate *dateTest3 = [dateformate dateFromString:@"08/08/2016"]; //Week no: 2
NSDate *dateTest4 = [dateformate dateFromString:@"15/08/2016"]; //Week no: 3
NSDate *dateTest5 = [dateformate dateFromString:@"22/08/2016"]; //Week no: 4
NSDate *dateTest6 = [dateformate dateFromString:@"29/08/2016"]; //Week no: 5
NSDate *dateTest7 = [dateformate dateFromString:@"05/09/2016"]; //Week no: 6

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest1];
dateString = [dateformate stringFromDate:dateTest1];
NSLog(@"dateTest1 -> %@",dateString); //output : dateTest1 -> 25/07/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 4

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest2];
dateString = [dateformate stringFromDate:dateTest2];
NSLog(@"dateTest2 -> %@",dateString); //output : dateTest2 -> 01/08/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 1

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest3];
dateString = [dateformate stringFromDate:dateTest3];
NSLog(@"dateTest3 -> %@",dateString); //output : dateTest3 -> 08/08/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 2

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest4];
dateString = [dateformate stringFromDate:dateTest4];
NSLog(@"dateTest4 -> %@",dateString); //output : dateTest4 -> 15/08/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 3

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest5];
dateString = [dateformate stringFromDate:dateTest5];
NSLog(@"dateTest5 -> %@",dateString); //output : dateTest5 -> 22/08/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 4

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest6];
dateString = [dateformate stringFromDate:dateTest6];
NSLog(@"dateTest6 -> %@",dateString); //output : dateTest6 -> 29/08/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 5

components = [calendar components:NSCalendarUnitWeekOfMonth fromDate:dateTest7];
dateString = [dateformate stringFromDate:dateTest7];
NSLog(@"dateTest7 -> %@",dateString); //output : dateTest7 -> 05/09/2016
NSLog(@"Week no: %ld",(long)[components weekOfMonth]); //output : Week no: 2

As you can see dateTest1 should be Week no = 5 and NOT Week no = 4. For the other dates there is no problems as I see and as you can see.

I need the correct WeekOfMonth to set my FFCalendar properly https://github.com/fggeraissate/FFCalendar

Answer 1

let calendar = NSCalendar.currentCalendar()
let dateComponent = calendar.components([.WeekOfYear, .Day, .Month, .Year], fromDate: NSDate(timeIntervalSinceNow: 0))
print("weekOfYear \(dateComponent.weekOfYear)")

Using above code you can get the weekOfYear. Now you need to calculate weekOfYear of the first date of that month and the date you need to find. now for getting the weekOfMonth get the diff + 1 of both WeekOfYear

Answer 2

Following the solution proposed raj-aggrawal I made this solution that is working good

NSDate *date = [[FFDateManager sharedManager] currentDate];

NSDateFormatter *dateformate=[[NSDateFormatter alloc]init];
[dateformate setDateFormat:@"dd/MM/yyyy"]; // Date formater

NSString *dateString = [dateformate stringFromDate:date];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* dateComponent = [calendar components:NSWeekOfYearCalendarUnit|NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:date];
NSInteger weekOfYearCurrent =(long)[dateComponent weekOfYear];
dateString = [dateformate stringFromDate:date];
NSLog(@"dateCurrent -> %@",dateString);
NSLog(@"weekOfYearCurrent: %ld",(long)weekOfYearCurrent);

NSDate *dateFirstMonth = [dateformate dateFromString:[NSString stringWithFormat:@"01/%d/2016", (int)[dateComponent month]]];
dateComponent = [calendar components:NSWeekOfYearCalendarUnit|NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:dateFirstMonth];
NSInteger weekOfYearFirstDayOfMonth =(long)[dateComponent weekOfYear];
dateString = [dateformate stringFromDate:dateFirstMonth];
NSLog(@"dateFirstMonth -> %@",dateString);
NSLog(@"weekOfYearFirstDayOfMonth: %ld",(long)weekOfYearFirstDayOfMonth);

NSInteger NumberWeekOfMonth = (weekOfYearCurrent - weekOfYearFirstDayOfMonth) + 1;
NSLog(@"NumberWeekOfMonth: %ld",(long)NumberWeekOfMonth);