Is this possible to assign NSDate variable to a nil?

Suppose if i want to erase a 开发者_运维知识库value stored in a NSString variable, i will assign a nil to it. This is possible. But if i want to erase a date variable that already holds some values, what should i do?

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nil is just an object placeholder. You can assign any Objective-C object pointer to it.

So yeah, you can assign a variable of type NSDate * to nil.

If you have ownership of the object however, you should send it the -release message before setting the variable to nil or else the memory pointed to by the variable will be leaked.

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you can... but it is advisable to release it if it is not autorelease object..

i.e

[dateObject release]; // Only if it is not autorelease object.
dateObject = nil;