How to get 24 hr format time from iDevices?

I am working on application that required iPhone date and time to post开发者_如何学JAVA on server. now this date and time on different devices are always different all over the world based on region and time zone. I would like to have local date time in 24 hrs only, though if the user has changed the setting>date & time>24 hour time>off

As I am not getting the time in 'yyyy-MM-dd HH:mm:ss' format, it is creating issue on sever side and showing wrong date and time on server. Is there any very specific solution for this?

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I'd suggest you should avoid sending formatted dates to a server and send UNIX timestamps instead. [[NSDate date] timeIntervalSince1970] gives you a time zone-independent timestamp which you don't have to parse. If you need the time zone too, send its identifier as an additional parameter.

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If you need time in 24 hour format then use capital H in dateFormatter:

dateFormatter.dateFormat = @"yyyy MM dd **HH**:mm:ss";

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Like Costique says, use an UNIX timestamp, but if you must have it in a String format, include the time zone in the format string and handle it on the server, you need something like:

NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
NSLocale *enUSPOSIXLocale = [[[NSLocale alloc] 
          initWithLocaleIdentifier:@"en_US_POSIX"] autorelease];        
[dateFormatter setLocale:enUSPOSIXLocale];
[dateFormatter setTimeStyle:NSDateFormatterFullStyle];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ssZZ"];
NSString *transDateStr = [dateFormatter stringFromDate:transDate];
[dateFormatter release];