格林尼治标准时间是一样的UTC？ [英] Is GMT same as UTC?
问题描述
我正在运行的世界有针对性的网站，人们来自世界各地的访问。该数据库包含在国际日期变更线以西格式的时间。我正在使用JavaScript用户时区和转换时间在数据库中的用户的时间，然后在页面上显示。我想问的是国际日期变更线以西是世界级的网站正确的格式？或者设置为UTC或GMT会更好？而这也正是UTC与GMT和国际日期变更线以西之间的区别？这三种一样吗？最后，我应该设置到我的服务器将使用转换什么时候用户的时区偏移？
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
如果你有兴趣的天文观测，例如卫星，如GPS，或者如果你想举一个技术标准（ITU-R TF.460的-6），那么你可能不在乎我们使用UTC和GMT不再有precise定义。否则，你可能认为GMT是同样的事情UTC，并考虑UT和UT1是一样的UTC - 这在技术上它们不是
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.
另外，如果你的电脑追踪罪犯或其他分布式的活动，那么你需要确定是否在各个站点的某些事件可能会或可能不会有某些其他事件发生之前。为了这个目的，你将要学习和使用网络时间协议（NTP）。这会对你的时间比UTC，UT1和UT之间差异不大理解产生的影响大得多。
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.
国际日期变更线西仅仅是其中时间被定义为比UTC（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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