If/Else statement for Date..iPhone SDK

Question

I have this bit of code here. How would I write an if/else statement to determine whether the itemDate has already passed? So if itemDate has already passed, then localnotif.fireDate should be what it is now, plus 86400 (for 24 hours) else leave as is.

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
        NSDateComponents *dateComps = [[NSDateComponents alloc] init];
        [dateComps setDay:item.day];
        [dateComps setMonth:item.month];
        [dateComps setYear:item.year];
        [dateComps setHour:item.hour];
        [dateComps setMinute:item.minute];
        NSDate *itemDate = [calendar dateFromComponents:dateComps];
        [dateComps release];
        UILocalNotification *localNotif = [[UILocalNotification alloc] init];
        if (localNotif == nil)
            return;

        localNotif.fireDate = [itemDate dateByAddingTimeInterval:-(minutesBefore*60)] ;
            NSLog(@"fireDate is %@",localNotif.fireDate);

        localNotif.timeZone = [NSTimeZone defaultTimeZone];

Answer 1

1. You can retrieve the current date using [NSDate date].
2. NSDate has this really convenient method called laterDate: that compares a date with the receiver and returns which ever one is later.
3. You can see if two dates are equal using isEqual:

In other words:

NSDate * notificationDate = [localNotif fireDate];
NSDate * now = [NSDate date];

if ([[now laterDate:notificationDate] isEqual:now]) {
  //in a comparison between "now" and "notificationDate", "now" is the later date,
  //meaning "notificationDate" has already passed
  notificationDate = [notificationDate dateByAddingTimeInterval:86400];
}
[localNotif setFireDate:notificationDate];