iPhone - Correct way for getting current date and time for a given place / timezone and compare it with another date/time in the same place

Question

I'm searching the correct way to get the actual date and time for a given place / timezone, and being able to compare it to a given date/time for that same place.

Let's say, for the example, Paris, that is GMT +1. As we now, Paris can also be GMT+2 because of daylight saving, but it's part of an exception as far as I know so it must be taken in account into the answer, but not taken as a general param. The important words here are "given place".

So, if I want to know what date and time it is at Sidney Australia, or Paris France, and get that date into an NSDate for being able to compare it with another NSDate that would represent another date/time in the same place, how may I do ?

I've read pages and pages of questions and answers with comments, even on accepted answer, that says from experienced users : not a good answer -1, wrong, not the correct way of doing this, absolutely wrong, ...

So, do you know the correct real way to do that ?

In a perfect world, that date/time would be absolute even if the user's phone is not at the good time and/or date and/or timezone, or anything that can be near that perfection without needing for that to connect to a date/time server.

Answer 1

I'm searching the correct way to get the actual date and time for a given place / timezone.

[NSDate date]returns a date object representing the current date and time, no matter where you are. NSDates are not subject to places or time zones. There is just one NSDate that represents now or any other moment for that matter, not different date objects for every time timezone. Therefore, you should not attempt to convert a date between time zones.

NSDate objects represent an absolute instant in time. Consider the following example of how two date representations in different time zones (9/9/11 3:54 PM in Paris and 9/9/11 11:54 PM in Sydney) are actually the same date.

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterShortStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Europe/Paris"]];
NSDate *aDate = [formatter dateFromString:@"9/9/11 3:54 PM"];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Australia/Sydney"]];
NSDate *anotherDate = [formatter dateFromString:@"9/9/11 11:54 PM"];
NSLog(@"%@",anotherDate);
if ([aDate isEqualToDate:anotherDate]) {
    NSLog(@"How about that?");
}

It logs that last message because 9/9/11 3:54 PM in Paris and 9/9/11 11:54 PM in Sydney are actually the same instant in time. When it is 9/9/11 3:54 PM in Paris, it is 9/9/11 11:54 PM in Sydney.

both gives in the debugger and NSLog 2011-09-09 14:26:02, but it's now 16:26 so I guess it should return 16:26:02 +0200

When it comes to output a date, bear in mind that NSDate's description method returns time in GMT and you need to use a NSDateFormatter to create a date string representing the local time in Paris, Sydney, etc. from a date:

NSDate *now = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterShortStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Australia/Sydney"]];
NSLog(@"%@",[formatter stringFromDate:now]); //--> 9/9/11 11:54 PM
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Europe/Paris"]];
NSLog(@"%@",[formatter stringFromDate:now]); //-->  9/9/11 3:54 PM

---

ok, but if I want to know if that time is after 15:00, how may I test that ?

Create an NSDate object that represents today at 15:00 (local time) and compare it to "now":

NSDate *now = [NSDate date];
NSCalendar* myCalendar = [NSCalendar currentCalendar];
NSDateComponents* components = [myCalendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit 
                                             fromDate:[NSDate date]];
[components setHour: 15];
[components setMinute: 0];
[components setSecond: 0];
NSDate *todayAt15 = [myCalendar dateFromComponents:components];
if ([now compare:todayAt15] == NSOrderedDescending) {
    NSLog(@"After 15:00 local time");
}

---

It turns out @Oliver needed to check if it is after 15:00 in Paris so he needed to create a date that represents today at 15:00 Paris time (not local time). For an example on how to do that, see @Oliver's answer. Just to be clear, my third snippet of code shows how to check if it is after 15:00 local time.