NSDateFormatter stringFromDate not returning a string - objective-c

Question

I'm trying to change a saved date to mountain standard time using NSDateFormatter but it doesn't seem to be working.
it's outputting
"currentDate: 2013-02-22 23:20:20 +0000 date With date formatter: other 2000-01-01 07:00:00 +0000"
to the console.
It looks like the string isn't being created correctly, but I seem to be calling it in the same way I've seen it called normally.
Suggestions?
NSTimeZone * mtnTimeZ= [NSTimeZone timeZoneWithAbbreviation:#"MST"];
NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setTimeZone:mtnTimeZ];
NSString * timeZ = [dateFormatter stringFromDate:currentDate];
NSDate * newDate = [dateFormatter dateFromString:timeZ];
NSLog(#"currentDate: %# string With dateFormatter: %# date made from string %#", currentDate, timeZ, newDate);

Answer 1

You need to set the style for specify date and time formats in order of it to work:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterFullStyle];
[dateFormatter setTimeStyle:NSDateFormatterFullStyle];
[dateFormatter setTimeZone:[NSTimeZone defaultTimeZone]];
NSString * dateCurrentTZ = [dateFormatter stringFromDate:[NSDate date]];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"MST"]];
NSString * dateMSTZ = [dateFormatter stringFromDate:[NSDate date]];
NSLog(#"Date In Current Time Zone: %#", dateCurrentTZ);
NSLog(#"Date In MST: %#", dateMSTZ);
In case you want to specify your own format:
NSDateFormatter Documentation
Then look for "Fixed Formats" based on iOS & Mac OSX ver. you are targeting.

Answer 2

Try putting the following line:
[dateFormatter setDateFormat:#"yyyy-MM-dd hh:mm:ss"];
like this:
NSTimeZone * mtnTimeZ= [NSTimeZone timeZoneWithAbbreviation:#"MST"];
NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"yyyy-MM-dd hh:mm:ss"];
[dateFormatter setTimeZone:mtnTimeZ];
NSString * timeZ = [dateFormatter stringFromDate:currentDate];
NSDate * newDate = [dateFormatter dateFromString:timeZ];
NSLog(#"currentDate: %# string With dateFormatter: %# date made from string %#", currentDate, timeZ, newDate);