Question

I need to convert an NSDate to an NSString and then take this NSString and convert it back to an NSDate with the full time and date – what is the best format to store this?

Answer 1

Convert to NSString,
first NSTimeInterval then create NSString object and do what you want.

Convert to NSDate,
first convert it to NSTimeInterval(double value) and create a NSDate object

NSDate *date = [NSDate date]; 
//        convert to NSString
NSString *strValue = [NSString stringWithFormat:@"%f", [date timeIntervalSince1970]]; 

//        convert to NSDate
date =  [NSDate dateWithTimeIntervalSince1970:[strValue doubleValue]];