How to find last day of current week in iPhone?

Question

In my application I'm using following codes to retrieve current date and day:

NSDate *today1 = [NSDate date];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd/MM/yyyy :EEEE"];
    NSString *dateString11 = [dateFormat stringFromDate:today1];

    NSLog(@"date: %@", dateString11);
    //[dateFormat release];
    NSCalendar *gregorian11 = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];  
    NSDateComponents *components1 = [gregorian11 components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:today1];
    [components1 setDay:([components1 day]-([components1 weekday]-1))];

    NSDate *beginningOfWeek1 = [gregorian11 dateFromComponents:components1];
    NSDateFormatter *dateFormat_first = [[NSDateFormatter alloc] init];
    [dateFormat_first setDateFormat:@"dd/MM/yyyy :EEEE"];
    NSString *dateString_first = [dateFormat_first stringFromDate:beginningOfWeek1];

    NSLog(@"First_date: %@", dateString_first);

but using above code I only got the current day and Date and first day of week but I need to get last day of week.

Where I'm wrong in my code and what modification is needed to get last day/date of week?

Answer 1

For me this works:

Calculate first day in week

NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *weekdayComponents     = [gregorian components:NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:today];

Calcuate number of days to substract from today, in order to get the first day of the week. In this case, the first day of the week is monday. This is represented by first subtracting 0 with the weekday integer followed by adding 2 to the setDay.

Sunday = 1, Monday = 2, Tuesday = 3, Wednesday = 4, Thursday = 5, Friday = 6 and Saturday = 7. By adding more to this integers, you will go into the next week.

NSDateComponents *componentsToSubtract  = [[NSDateComponents alloc] init];
[componentsToSubtract setDay: (0 - [weekdayComponents weekday]) + 2];   
[componentsToSubtract setHour: 0 - [weekdayComponents hour]];
[componentsToSubtract setMinute: 0 - [weekdayComponents minute]];
[componentsToSubtract setSecond: 0 - [weekdayComponents second]];

Create date for first day in week

NSDate *beginningOfWeek = [gregorian dateByAddingComponents:componentsToSubtract toDate:today options:0];

By adding 6 to the date of the first day, we can get the last day, in our example Sunday.

NSDateComponents *componentsToAdd = [gregorian components:NSDayCalendarUnit fromDate:beginningOfWeek];
[componentsToAdd setDay:6];
NSDate *endOfWeek = [gregorian dateByAddingComponents:componentsToAdd toDate:beginningOfWeek options:0];

Hope this helps

Answer 2

Try this.

[components1 setDay:([components1 day]-([components1 weekday]-1) + 6)];

NSDate *endOfWeek1 = [gregorian11 dateFromComponents:components1];