If you have an input date string (or rather, date-and-time string) in one format and you want to output in a different format then you need 2 date formatters: An input formatter that takes the source string format and converts it to an NSDate (using dateFromString
) and then an output formatter that takes the NSDate and converts it to your output date string (using stringFromDate
).
Your code is wrong because you are creating a date formatter configured for your output date string format and trying to use it to convert your input date string to an NSDate.
I am not an expert on NSDateFormatter date strings. Any time I need to work with them I have to dig out the docs and figure out the solution to the specific problem I'm trying to solve. Thus I'm going to leave that part of the problem to you. Suffice it to say that you'll need an input date formatter that uses a format string that exactly matches the format of your input date string. This can be tricky because if it isn't exactly correct it simply fails and returns a nil NSDate.
The output date formatter is easier because if it isn't quite right, your output date will not look the way you want it to look but that will be obvious.