1 self.expireTime = [theExpiredTime intValue]+ [[NSDate date] timeIntervalSince1970];

2

- (BOOL)isAuthorizeExpired

{
    if ([[NSDate date] timeIntervalSince1970] > expireTime)

   {
        //刪除操作
        return YES;
    }
    return NO;
}

以秒為單位計算