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#pragma mark - 获取时间戳、签名和用户ID
- (void)getTimestampAndSignAndUsers_ID
{
    [self getTimestamp];
    
    NSString *tempString = [StartSign stringByAppendingFormat:@"%@", timestampStr];
    NSString *endSignString = [MBTipClass md5HexDigest:tempString];
    // 转化为大写
    signStr = [endSignString uppercaseString];
}

#pragma mark - 获取当前时间
- (void)getTimestamp
{
#if 1
    NSDate *date = [NSDate date];
    NSTimeInterval time = [date timeIntervalSince1970];
    NSString *timeStr = [NSString stringWithFormat:@"%.0f", time];
    NSTimeZone *zone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];
    NSInteger interval = [zone secondsFromGMTForDate:date];
    NSDate *localeDate = [date dateByAddingTimeInterval:interval];
    NSTimeInterval time1 = [localeDate timeIntervalSince1970];
    __unused NSString *timeStr1 = [NSString stringWithFormat:@"%.0f", time1];
    timestampStr = timeStr;
#endif
#if 0
    NSDate *now = [NSDate date];
    NSDateFormatter *df = [[NSDateFormatter alloc]init];//时间戳格式化
    df.dateFormat = @"yyyy-MM-dd HH:mm:ss"; // 格式化年月日，时分秒
    df.timeZone = [NSTimeZone systemTimeZone];//系统所在时区
    NSString *systemTimeZoneStr =  [df stringFromDate:now];
    df.timeZone = [NSTimeZone defaultTimeZone];//默认时区，貌似和上一个没什么区别
    NSString *defaultTimeZoneStr = [df stringFromDate:now];
    df.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:8 * 3600];//直接指定时区
    NSString *plus8TZStr = [df stringFromDate:now];
    df.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:-4*3600];//这就是GMT+0时区了
    NSString *gmtTZStr = [df stringFromDate: now];
    NSLog(@"Test Time\nSys:%@\nDefault:%@\n+8:%@\nGMT:%@",systemTimeZoneStr,defaultTimeZoneStr,plus8TZStr,gmtTZStr);
    
    NSDate *date = [df dateFromString:systemTimeZoneStr];
    timestampStr = [NSString stringWithFormat:@"%.0f", [date timeIntervalSince1970]];
#endif
}

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解决上述类似问题：

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