ios - How to reuse a NSString method? -

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I am writing a method that takes the string and gives the string I'm trying to use it in some other method I am 

  - (NSString *) formatDate: (NSString *) showStartDateTime {NSTimeZone * tz = [NSTimeZone Time ZoneWithName: @ "UTC"]; NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; [Date-time set-timezone: TJ]; [DateFormatter setDateFormat: @ "EEE MM / DD / Yay"]; NSDate * dattt = [dateFormatter dateFromString: showStartDateTime]; [DateFormatter setDateFormat: @ "yyyy-MM-dd"]; NSString * tempo2 = [dateFormatter stringFromDate: dattt]; Return tempo 2; }   
 In this way I am using it. [Self format date: @ "Venus 08/08/2014"] Is this the right way to use it?  
  NSString * hellostring = [Self format date: @ "Venus 08/08/2014"]; NSLog (@ "% @", hellostring);   
 I know that this does not work. Any suggestion is appreciated.   
 
 
 I wrote a command line app and it was not already able to run  dateFromString :  As a result of Neil, I added  dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier: @ "en_US_POSIX"]   
  - (NSString *) FormatDate: (NSString *) showStartDateTime {NSTimeZone * tz = [NSTimeZone timezonename: @ "UTC"] ;; NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; [Date-time set-timezone: TJ]; DateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier: @ "en_US_POSIX"]; [DateFormatter setDateFormat: @ "EEE MM / DD / Yay"]; NSDate * dattt = [dateFormatter dateFromString: showStartDateTime]; [DateFormatter setDateFormat: @ "yyyy-MM-dd"]; NSString * tempo2 = [dateFormatter stringFromDate: dattt]; Return tempo 2; }   
 now returns  2014-08-08

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