iOS: convert UTC timezone to device local timezone
ios, objective-c, timezone
Solution
Time zones can be applied to NSDateFormatter, from which you can generate NSDate variables differentiated by the time difference.
NSString* input = @"2013-08-03T05:38:39.590Z";
NSString* format = @"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
// Set up an NSDateFormatter for UTC time zone
NSDateFormatter* formatterUtc = [[NSDateFormatter alloc] init];
[formatterUtc setDateFormat:format];
[formatterUtc setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
// Cast the input string to NSDate
NSDate* utcDate = [formatterUtc dateFromString:input];
// Set up an NSDateFormatter for the device's local time zone
NSDateFormatter* formatterLocal = [[NSDateFormatter alloc] init];
[formatterLocal setDateFormat:format];
[formatterLocal setTimeZone:[NSTimeZone localTimeZone]];
// Create local NSDate with time zone difference
NSDate* localDate = [formatterUtc dateFromString:[formatterLocal stringFromDate:utcDate]];
NSLog(@"utc: %@", utcDate);
NSLog(@"local: %@", localDate);
[formatterUtc release];
[formatterLocal release];
Problem
I am trying to convert the following timezone to device local timezone: ``` 2013-08-03T05:38:39.590Z ``` Please let me know how to convert it to local timezone. How do I do it?