Xcode preprocessor macro for dates

Question

I want to "hardcode" an expiration date into my beta code. Right now I manually calculate a unix date and compare that to the current date time:

 if([[NSDate date] timeIntervalSince1970]>1422748800) mustHalt = TRUE;

I'd like a way of replacing the 1422748800 with a macro that generates the equivalent number for a date 90 days in the future at compile time.

Any suggestions?

score 3 · Accepted Answer · edited May 23 '17 at 11:45

3

The predefined macro __DATE__ is what you need. Here is a SO question related to this. But maybe you want to use a code like this:

    const int daysToExpire = 14;

    NSString *compileDate = [NSString stringWithUTF8String:__DATE__];
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    [df setDateFormat:@"MMM d yyyy"];
    NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
    [df setLocale:usLocale];
    NSDate *expireDate = [df dateFromString:compileDate];

    bool isExpired = ([[NSDate date] compare:expireDate] == NSOrderedDescending); // decide for it

edited May 23 '17 at 11:45

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answered Jan 24 '15 at 13:44

Michael Dorner

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A Macro is not needed and not even a hood idea, it would be better as just a method. The key part of the answer is using `__DATE__`. Additionally the code will not compile. – zaph Jan 24 '15 at 13:53
Sure, you are right. But as I understood, this was the question. – Michael Dorner Jan 24 '15 at 13:56
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This works for me - thank you. The key was creating a compile-date-based constant. – JeremyLaurenson Jan 24 '15 at 14:15
@Zaph: Now I got you. But I think I got the intension. – Michael Dorner Jan 24 '15 at 14:15

Xcode preprocessor macro for dates

1 Answers1