date format is not working properly - ios

Question

I am converting date as per timezone and i have one more requirement is date format. Now i am getting date in 12/15/14, 5:00 AM format but i want it in “18th Nov. 2014 at 5:15 PM” format.Event I am not getting proper output as per my date format.
Is this possible in "Objective C".My code is :
-(NSString *)dateFormater : (NSString *)dateStr
{
//NSString *dateStr = #"2014-11-30T21:25:00+00:00";
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
[dateFormatter1 setDateFormat:#"yyyy-MM-dd'T'HH:mm:ssz"];
// [dateFormatter1 setDateFormat:#"dd MMM,yyyy'T'HH:mm:ssz"];
NSDate *date = [dateFormatter1 dateFromString:dateStr];
NSLog(#"date : %#",date);
NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone];
NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithAbbreviation:#"UTC"];
NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:date];
NSInteger gmtOffset = [utcTimeZone secondsFromGMTForDate:date];
NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset;
NSDate *destinationDate = [[NSDate alloc] initWithTimeInterval:gmtInterval sinceDate:date];
NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
// [dateFormatters setDateFormat:#"dd-MMM-yyyy hh:mm"];
[dateFormatters setDateFormat:#"dd MMM, yyyy hh:mm a"];
[dateFormatters setDateStyle:NSDateFormatterShortStyle];
[dateFormatters setTimeStyle:NSDateFormatterShortStyle];
[dateFormatters setDoesRelativeDateFormatting:YES];
[dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];
dateStr = [dateFormatters stringFromDate: destinationDate];
NSLog(#"DateString : %#", dateStr);
return dateStr;
}

Answer 1

You format string dd MMM, yyyy hh:mm a is correct but after setting the format string you are changing it again.
Remove these lines:
[dateFormatters setDateStyle:NSDateFormatterShortStyle];
[dateFormatters setTimeStyle:NSDateFormatterShortStyle];
But in general I would not use a static format string, at least not if you are releasing the app world wide. Since most countries have different localization for presentation purposes you are better of using :
dateStr = [NSDateFormatter localizedStringFromDate:date dateStyle:NSDateFormatterMediumStyle timeStyle:NSDateFormatterShortStyle];