GMT 和 UTC 一样吗? [英] Is GMT same as UTC?

问题描述

我正在运营一个面向全球的网站，来自世界各地的人们都可以访问该网站.该数据库包含国际日期变更线西格式的时间.我正在使用 JavaScript 获取用户时区并将数据库中的时间转换为用户的时间，然后显示在页面上.我想问一下国际日期变更线西是世界级网站的正确格式吗?或者设置为UTC或GMT会更好?UTC 和 GMT 以及国际日期变更线西有什么区别?这三个一样吗?最后我应该在我的服务器上设置什么时间来使用用户时区的偏移量进行转换?

I am running a world targeted website where people from all over the world visit. The database contains time in International Date Line West format. I am taking the user time zone using JavaScript and converting the time in the database to user's time and then showing on the page. I want to ask that is International Date Line West is correct format for world level website? Or setting to UTC or GMT will be better? And what is the difference between UTC and GMT and International Date Line West? Are these three same? Finally what time should I set onto my server that will be converted using offset of timezone of user?

推荐答案

如果您对天文观测感兴趣，例如像 GPS，或者如果您想引用技术标准(ITU-R TF.460-6)，那么您可能会关心我们使用 UTC 并且 GMT 不再有精确的定义.否则，您可能认为 GMT 与 UTC 相同，并且还考虑 UT 和 UT1与 UTC 相同——从技术上讲它们不是.

If you're interested in astronomical observations, for example of satellites such as GPS, or if you want to cite a technical standard (ITU-R TF.460-6), then you might care that we use UTC and that GMT no longer has a precise definition. Otherwise you probably consider GMT to be the same thing as UTC, and also consider UT and UT1 to be the same as UTC — which technically they are not.

此外，如果您要跟踪计算机犯罪分子或其他分布式活动，那么您需要确定各个站点的某些事件是否在某些其他事件之前发生过.为此，您需要学习和使用网络时间协议 (NTP).与 UTC、UT1 和 UT 之间的微小差异相比，这对您理解时间的影响要大得多.

Also, if you're tracking computer criminals or other distributed activity, then you need to determine whether certain events at various sites may or may not have occurred before certain other events. For that purpose you will want to learn and use Network Time Protocol (NTP). That will have a much bigger effect on your understanding of time than the little differences between UTC, UT1, and UT.

"国际日期变更线 West"只是一个时区的友好名称定义为比 UTC 少 12 小时(即 UTC-12).

"International Date Line West" is just a friendly name for a timezone where the time is defined as twelve hours less than UTC (that is, UTC-12).

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