计算机知识 birthtime: "2021-11-21T16:47:41.000Z" Z 的含义 - V2EX
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计算机知识 birthtime: "2021-11-21T16:47:41.000Z" Z 的含义

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  •   selfcreditgiving 2021-11-22 01:07:59 +08:00 3096 次点击
    这是一个创建于 1428 天前的主题,其中的信息可能已经有所发展或是发生改变。
    最近用到了 node fs.stats 查看文件的属性,发现日期时间打印最末尾有一个 Z , 那个 T 是 Time 的意思,那么 Z 之前一直觉得是 timeZone 的 Zone ,或者是 Z 是 26 个字母的最后一个,代表结束。

    今天好奇查了一下,原来都不是, Z 是表示 Zulu time 祖鲁时间。 和 UTC 、GMT 意思是差不多的。

    原来这一个字母就代表一个 Time Zone 了。感兴趣的也可以看看这里:

    https://stackoverflow.com/questions/64304058/what-the-meaning-of-t-z-for-date

    https://en.wikipedia.org/wiki/ISO_8601
    9 条回复    2021-11-23 14:19:14 +08:00
    selfcreditgiving
        1
    selfcreditgiving  
    OP
       2021-11-22 01:25:50 +08:00   6
    不能 append 了。

    原来 Zulu Time 这是 military time zone 的代号,和 Zulu 祖鲁本身并没又关系。

    不光是 Z ,A ~ Z 除了 J 都代表一个时区。

    详细的可以看这里:
    List of military time zones
    https://en.wikipedia.org/wiki/List_of_military_time_zones
    ericFork
        2
    ericFork  
       2021-11-22 04:12:18 +08:00
    有趣,我想当然地以为是 Zero 的 Z 了
    ggmood
        3
    ggmood  
       2021-11-22 07:55:21 +08:00 via iPhone
    五眼联盟搞的这些和直接用数字哪个更方便?
    cpstar
        4
    cpstar  
       2021-11-22 08:45:46 +08:00
    > If the time is in UTC, add a Z directly after the time without a space. Z is the zone designator for the zero UTC offset.

    wiki 有这么一句话,跟 zulu time 的说法打架
    cpstar
        5
    cpstar  
       2021-11-22 08:48:36 +08:00
    当然还有这么一句话,但我觉得是一种重复使用,于是 Z 的实际意义可能并非 zulu 而是 zero

    > The Z suffix in the ISO 8601 time representation is sometimes referred to as "Zulu time" because the same letter is used to designate the Zulu time zone.
    > However the ACP 121 standard that defines the list of military time zones makes no mention of UTC and derives the "Zulu time" from the Greenwich Mean Time which was formerly used as the international civil time standard. GMT is no longer precisely defined by the scientific community and can refer to either UTC or UT1 depending on context.
    Davic1
        6
    Davic1  
       2021-11-22 08:51:27 +08:00
    明白了,我们都在旅馆时区(H zone +8)
    xz410236056
        7
    xz410236056  
       2021-11-22 09:58:04 +08:00
    这跟计算机没关系,这是北约音标字母,正式称为国际无线电通话拼写字母。所有地方都是这么用的
    selfcreditgiving
        8
    selfcreditgiving  
    OP
       2021-11-22 14:09:59 +08:00 via Android
    @xz410236056 对想起来了,ham 无线电呼号也是这样的 每个字母用一个单词来报,和这个单词一样,目的是让人听的更清楚。 就相当于我们说 选择题 A B C D , Boy 是 B Dog 是 D
    pythonee
        9
    pythonee  
       2021-11-23 14:19:14 +08:00
    @selfcreditgiving 有趣的知识又增加了
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