How to know when to release an NSDate object?

Question

Any or both of these date pointers require [release] when I am done with them. How do I know this? I am not sure, since I am not doing init explicitly.

NSDate *date = [NSDate date];

NSDate *date = [dateWithTimeIntervalSince1970:100000000];

Answer 1

Both are auto-implemented, that is, you do not need to release them yourself. A rule of thumb is that you own the object if you send + alloc or -copy or explicitly save it:

• [[SomeClass alloc] init ...]
• [someObject copy]
• [some object is saved]

If you have an object, you must free it. + new is a shortcut for + alloc and -init.

Answer 2

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