在不同时区的同一日期 [英] Same date in different time zone

问题描述

我的问题是如何在不同时区获得同一天，一个月，一个月，一小时，几分钟，几秒钟，例如：

My question is how can I get the same day, month, year, hour, minutes, seconds in a different time zone, for example:

var now = moment().valueOf();
var result1 = moment(now).format('DD-MM-YYYY HH:mm:SS Z');

在我的时区，我得到一些这样的：

In my time zone I get some this like this:

18-02-2015 21:08:34 +01:00

所以如何更改时区而不改变其他值（天，月，...，分，...）

So how can I change only time zone without changing other values (days, months, ..., minutes, ...)

想得到这样的东西：

    result2: 18-02-2015 21:08:34 +01:00
    result3: 18-02-2015 21:08:34 +10:00
    result4: 18-02-2015 21:08:34 +05:00
    result5: 18-02-2015 21:08:34 -06:00
    result6: 18-02-2015 21:08:34 -11:00

提前感谢

推荐答案

以下是您可以问：

Here's how you could do what you are asking:

// get a moment representing the current time
var now = moment();

// create a new moment based on the original one
var another = now.clone();

// change the offset of the new moment
another.utcOffset('+05:30');

// shift the moment by the difference in offsets
another.add(now.utcOffset() - another.utcOffset(), 'minutes');

// log the output
console.log(now.format());      // "2016-01-15T11:58:07-08:00"
console.log(another.format());  // "2016-01-15T11:58:07+05:30"

但是，你必须识别两个重要的事情：

However, you must recognize two important things:

• 另一个对象否更长的时间表示当前时间 - ，即使在目标时区。这是一个完全不同的时间。 （世界不同步本地时钟，如果是这样，我们不需要时区！）。

• The another object no longer represents the current time - even in the target time zone. It's a completely different moment in time. (The world does not synchronize local clocks. If it did, we'd have no need for time zones!).

因此，即使上述代码满足有问题的问题，我强烈建议不要使用它。相反，重新评估您的要求，因为它们可能会误解时间和时区的性质。

For this reason, even though the above code satisfies the question that was asked, I strongly recommend against using it. Instead, re-evaluate your requirements, as it's likely they are misunderstanding the nature of time and time zones.

时区无法用偏移量完全表示单独。请阅读时区标签wiki 中的Time Zone！= Offset。虽然一些时区具有固定的偏移量（例如印度使用的+05：30），但是许多时区在一年中的不同点更改其偏移量，以适应​​夏令时。

A time zone cannot be fully represented by an offset alone. Read "Time Zone != Offset" in the timezone tag wiki. While some time zones have fixed offsets (such as +05:30 used by India), many time zones change their offsets at different points throughout the year to accommodate daylight saving time.

如果你想说明这一点，你可以使用 moment-timezone ，而不是调用 utcOffset（...）。但是，我的第一个项目符号中的问题仍然适用。

If you wanted to account for this, you could use moment-timezone instead of calling utcOffset(...). However, the issue in my first bullet would still apply.

// get a moment representing the current time
var now = moment();

// create a new moment based on the original one
var another = now.clone();

// change the time zone of the new moment
another.tz('America/New_York'); // or whatever time zone you desire

// shift the moment by the difference in offsets
another.add(now.utcOffset() - another.utcOffset(), 'minutes');

// log the output
console.log(now.format());      // "2016-01-15T11:58:07-08:00"
console.log(another.format());  // "2016-01-15T11:58:07-05:00"

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