Momentjs时区-在特定时区的时间获取日期 [英] Momentjs timezone - getting date at time in specific timezone

问题描述

我正在尝试从UTC基准在用户的特定时区(在本例中为美国/洛杉矶")中使用momentjs/momentjs时区创建日期.但是，我没有得到我期望的结果:

I am attempting to create a date from a UTC base in a user's specific timezone, in this case "America/Los Angeles" using momentjs/momentjs timezone. However, I'm not getting the results I expect:

var tempDate = moment(1448841600000); //moment("2015-11-30"); //monday 11/30 in UTC
var adjustedStart = moment.tz(tempDate, "America/Los_Angeles");
adjustedStart.hour(9);
adjustedStart.minute(30);
console.log("adjustedStart in milliseconds:" + adjustedStart.valueOf());

控制台输出为1448875800000，这是UTC/GMT的11/30/15 9:30 AM，我期望的1448904600000是太平洋海岸时间的11/30/15 9:30 AM.如何将此开始日期转换为用户所在时区的正确时间?

The console output is 1448875800000 which is 11/30/15 9:30AM in UTC/GMT, I was expecting 1448904600000 which is 11/30/15 9:30AM in Pacific Coast time. How can I translate this start date to the right time in the user's timezone?

推荐答案

是的，1448841600000是您说的日期:

moment(1448841600000).utc().format()
// "2015-11-30T00:00:00+00:00"

但这是太平洋时间的前一天

But that is a day earlier in Pacific time

moment(1448841600000).tz('America/Los_Angeles').format()
// "2015-11-29T16:00:00-08:00"

当您将其调整为9:30太平洋时，它位于29号，而不是30号.

When you adjust it to 9:30 pacific, it's on the 29th, not the 30th.

moment(1448841600000).tz('America/Los_Angeles').hour(9).minute(30).format()
// "2015-11-29T09:30:00-08:00"

致电valueOf时，结果为:

moment(1448841600000).tz('America/Los_Angeles').hour(9).minute(30).valueOf()
// 1448818200000

这是正确的值，但是与您提供的值不同.但是，这确实是我在运行您的代码时得到的.

This is the correct value, however it's different than the one you provided. However, it is indeed what I get when I run your code as well.

Chrome调试窗口中的屏幕截图，其中包含您的确切代码:

Screenshot from Chrome debug window, with your exact code:

此外，在您写的评论中:

Also, in comments you wrote:

//moment("2015-11-30"); //monday 11/30 in UTC

实际上，这将是当地时间 ，而不是UTC.如果要使用UTC，请使用:

Actually, that would be in local time, not UTC. If you wanted UTC, you'd use:

moment.utc("2015-11-30")

尽管我不清楚您是使用此字符串输入还是数字时间戳.

Though it's unclear to me whether you are using this string input or the numeric timestamp.

如果您要问的是希望将UTC日期视为本地日期，然后应用任意本地时间-这是一个有点奇怪的操作，但是会发生以下情况:

If what you are asking is that you want the UTC date to be treated as if it were local and then have an arbitrary local time applied - that is a somewhat strange operation, but it would go something like this:

var tempDate = moment.utc(1448841600000);
var adjustedStart = moment.tz([tempDate.year(), tempDate.month(), tempDate.date(), 9, 30],
                                                                  "America/Los_Angeles");
console.log("adjustedStart in milliseconds:" + adjustedStart.valueOf());
// adjustedStart in milliseconds:1448904600000

这提供了您所要求的价值，但对我来说-这是一种气味，说明期望有问题.我会仔细研究需求和系统的其他部分.

This gives the value you asked for, but to me - this is a smell that something is wrong with the expectation. I'd look a lot closer at the requirement and the other parts of the system.

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