Check if NSDate is in next week - objective-c

Question

I tried the following code, but I do not get a condition where the date is in next week. How will I know that the date which is parameter in the function falls in next week? Following code always returns 1.
- (NSInteger)thisW:(NSDate *)date
{
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *todaysComponents =
[gregorian components:NSYearCalendarUnit fromDate:[NSDate date]];
NSUInteger todaysWeek = [todaysComponents weekOfYear];
NSDateComponents *otherComponents =
[gregorian components:NSYearCalendarUnit fromDate:date];
NSUInteger datesWeek = [otherComponents weekOfYear];
//NSLog(#"Date %#",date);
if(todaysWeek==datesWeek){
//NSLog(#"Date is in this week");
return 1;
}else if(todaysWeek+1==datesWeek){
//NSLog(#"Date is in next week");
return 2;
} else {
return 0;
}
}

Answer 1

You need to pass NSCalendarUnitWeekOfYear when extracting date components:
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *todaysComponents = [gregorian components:NSCalendarUnitWeekOfYear fromDate:[NSDate date]];
NSUInteger todaysWeek = [todaysComponents weekOfYear];
NSDateComponents *otherComponents = [gregorian NSCalendarUnitWeekOfYear fromDate:date];
NSUInteger datesWeek = [otherComponents weekOfYear];

Answer 2

Using datecomponents for week calculations will give you problems when the dates are close to year's end, i.e. "The first week of the year is designated to be the week containing the first Thursday of the year.(ISO 8601)"
I find it easier to compare dates with certain granularity, weekly in this case (the following code detects if a date is more than one week in the past, last week, this week, next week or further in the future)
-(EventWeekRange)numberOfWeeksFromTodayToEvent:(NSDate *)eventDate {
NSCalendar *calendar = [NSCalendar currentCalendar];
NSComparisonResult comparison = [calendar compareDate:[NSDate date] toDate:eventDate toUnitGranularity:NSCalendarUnitWeekOfYear];
if (comparison == NSOrderedSame) {
return RangeThisWeek;
} else if (comparison == NSOrderedAscending) { // The event date is in the future
// Advance today's date one week to check if this new date is in the same week as the event
NSDate *todaysNextWeek = [[NSDate date]dateByAddingTimeInterval:60*60*24*7];
if ([calendar compareDate:todaysNextWeek toDate:eventDate toUnitGranularity:NSCalendarUnitWeekOfYear] == NSOrderedSame) {
return RangeNextWeek;
} else {
return RangeLater;
}
} else { // The event date is in the past
// Advance the event's date one week to check if this new date is in the same week as today
NSDate *eventsNextWeek = [eventDate dateByAddingTimeInterval:60*60*24*7];
if ([calendar compareDate:eventsNextWeek toDate:[NSDate date] toUnitGranularity:NSCalendarUnitWeekOfYear] == NSOrderedSame) {
return RangeLastWeek;
} else {
return RangeEarlier;
}
}
}