OC_NSTimeZone

1.iOS NSTimeZone 自定义时区的使用(收集):
http://www.jianshu.com/p/9c882fc4bc73
2.iOS时间与日期处理（收集）:
http://www.jianshu.com/p/418035e65877

3.时间转换

[NSTimeZone systemTimeZone];//系统所在时区 [NSTimeZone defaultTimeZone];//默认时区，貌似和上一个没什么区别 [NSTimeZone timeZoneForSecondsFromGMT:0];//这就是GMT+0时区了 - (NSString *)timeFormate:(NSTimeInterval)time{    int sec = time;    NSDate *date = [NSDate dateWithTimeIntervalSince1970:sec];    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];    NSTimeZone* GTMzone = [NSTimeZone timeZoneForSecondsFromGMT:8];    [formatter setTimeZone:GTMzone];    NSString *timeStr = nil;    if (sec < 60)    {        if (sec < 10)        {            timeStr = [NSString stringWithFormat:@"0%d",sec];        }        else        {            timeStr = [NSString stringWithFormat:@"%d",sec];        }        timeStr = [NSString stringWithFormat:@"00:00:%@",timeStr];    }    else if (sec < 3600)    {        [formatter setDateFormat:@"mm:ss"];        timeStr = [formatter stringFromDate:date];        timeStr = [NSString stringWithFormat:@"00:%@",timeStr];    }    else    {        [formatter setDateFormat:@"HH:mm:ss"];        timeStr = [formatter stringFromDate:date];    }    return timeStr;}