Locale-Sensitive Objective-C Method

NSCalendar timeZone
NSDateComponents timeZone
NSDateFormatter timeZone

For NSCalendar timeZone, click here for Apple Developer Documentation details.
For NSDateComponenets timeZone, click here for Apple Developer Documentation details.
For NSDateFormatter timeZone, click here for Apple Developer Documentation details.

For information about Objective-C Internationalization, click here.