i need to calculate the weekday for a given date, however, depending on the calendar a week can star on Monday and somwhere on Sunday
so i wanted to set it, to start on Monday, using
[[NSCalendar currentCalendar] setFirstWeekday:2];
however, the calculation outcome is the same
{
[[NSCalendar currentCalendar] setFirstWeekday:1];
NSDateComponents *weekdayComponents = [[NSCalendar currentCalendar] components:(NSDayCalendarUnit | NSWeekdayCalendarUnit) fromDate:date];
NSInteger weekday = [weekdayComponents weekday] - 1;
NSLog(@"%d", weekday);
}
{
[[NSCalendar currentCalendar] setFirstWeekday:2];
NSDateComponents *weekdayComponents = [[NSCalendar currentCalendar] components:(NSDayCalendarUnit | NSWeekdayCalendarUnit) fromDate:date];
NSInteger weekday = [weekdayComponents weekday] - 1;
NSLog(@"%d", weekday);
}
returns same numbers, but why?
The behavior you see is correct. The weekday component is not affected by the firstWeekday property. If you have a date representing a sunday it will always be a sunday wether you start your week on that sunday or on monday. What this should affect is the week number in the week property of your date components.