dateWithTimeIntervalSince1970 method return wrong date

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the timezone will change ,when i put different seconds in dateWithTimeIntervalSince1970: method here is the code :

NSDateFormatter* dateFormat = [[[NSDateFormatter alloc] init] autorelease];
[dateFormat setDateFormat:format];
[dateFormat setTimeZone:[NSTimeZone localTimeZone]]; //Asia/shanghai +8:00
int64_t timestamp = 714880800 ;//  683258400
NSDate* date = [NSDate dateWithTimeIntervalSince1970:timestamp];
NSString *str = [dateFormat stringFromDate:date];

I make timestamp = 714880800 first time,and then 683258400,but the result is that:

so ,if there is something i missed?

asked 33 secs ago

Dean

93

dateWithTimeIntervalSince1970 method return wrong date