Question

how can I program a code, which counts every X-day. Like count every monday (or thursday, or whatever) from one NSDate to another (today).
I know, how to get the day of an NSDate by checking

    $int weekday = [[NSCalendar currentCalendar]components:NSWeekdayCalendarUnit fromDate:myDate]weekday];

but this isn’t helping a bit…

(Of course, I could just calculate all days and / 7, but this isn’t working for my project I’m working on…)

Answer 1

Run a while loop starting at the first NSDate and ending at the last NSDate. Increment by one day each time and check whether the day is equal to the day you want.

int counter = 0;
while ([NSDate laterDate:earlyDate:lateDate] == lateDate)
{
     int weekday = [[NSCalendar currentCalendar]components:NSWeekdayCalendarUnit fromDate:earlyDate]weekday];
     if (weekday == desiredWeekday) counter++;
     earlyDate = [earlyDate dateByAddingTimeInterval:3600*24];
}