Create time stamp

[NSDate date] can return the time which refers to GMT.
If you want the appropriate time zone, you need to plus/minus the time different with [NSDate date].
The below code can make up the time for Hong Kong time zone.

- (NSDate *)timeStamp

{

    // Get GMT time

    NSTimeInterval rightNowInterval = [[NSDate date] timeIntervalSince1970];

   

    // time difference is 8 hours between GMT and Hong Kong

    NSTimeInterval estoniaTimeZoneDifference = 60*60*8;//60 seconds, 60 minutes, 8 hours

    // Hong Kong is 8 hours ahead GMT

    NSDate *timeStamp = [NSDate dateWithTimeIntervalSince1970:(rightNowInterval + estoniaTimeZoneDifference)];

    

    return timeStamp;

}