I use date formatter to get new string, but in some cases startDate can be nil.
resultDate = [NSString stringWithFormat:@"%@", [formatter stringFromDate:startDate]];
And then resultDate get (null) string (NSTaggedPointerString), but I expect to get just nil in case if formatter get nil as a parameter of date.
The currently accepted answer isn't actually right.
stringFromDate does return nil when you pass it a nil date.
The reason your string is "(null)" is because [NSString stringWithFormat:"%@", nil] returns the string "(null)"
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