Date formatter issue in iOS

Date formatter issue in iOS

I'm trying to set date-formatter for the time 01/09/13 20:55:00+02:00,
NSDateFormatter *departureFormatter = [[NSDateFormatter alloc] init];
[departureFormatter setDateFormat:@"dd/MM/yy HH:mm:ss+Z"];
NSDate *departureDate = [departureFormatter dateFromString:fullDateString];
but it's not succeeding.
Any pointers?