gistfile1.m

- (NSDate *)beginningOfWeek {
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    // Get the weekday component of the current date
	NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit) 
											   fromDate:self];
    [components setWeekday:1];
	return [calendar dateFromComponents:components];
}

- (NSDate *)endOfWeek {
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    // Get the weekday component of the current date
	NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit) 
											   fromDate:self];
    [components setWeekday:1];
    [components setWeek:[components week]+1];
	return [calendar dateFromComponents:components];
}