实例说明如何把gtm+0转化成gtm+8

NSString *stringdata=[NSString stringWithFormat:@"2012-09-28 08:36:29"];

NSDateFormatter *datefor=[[NSDateFormatter alloc]init];

[datefor setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

NSDate *olddate=[datefor dateFromString:stringdata];

NSTimeInterval timezone=[[NSTimeZone systemTimeZone]secondsFromGMT];

NSDate *newdate=[olddate dateByAddingTimeInterval:timezone];

NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];

[dateformatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

NSString * locationString=[dateformatter stringFromDate:newdate];

NSLog(@"oldstring==%@",stringdata);

NSLog(@"newstring==%@",locationString);