javascript moment.js - UTC 不像我期望的那样工作
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moment.js - UTC does not work as i expect it
提问by hereandnow78
testing in the node console:
在节点控制台中测试：
var moment = require('moment');
// create a new Date-Object
var now = new Date(2013, 02, 28, 11, 11, 11);
// create the native timestamp
var native = Date.UTC(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(), now.getMinutes(), now.getSeconds());
// create the timestamp with moment
var withMoment = moment.utc(now).valueOf()
// it doesnt matter if i use moment(now).utc().valueOf() or moment().utc(now).valueOf()
// native: 1364469071000
// withMoment: 1364465471000
native === withMoment // false!?!?!
// this returns true!!!
withMoment === now.getTime()
why isnt native the same timestamp as withMoment? why does withMoment return the timestamp calculated from the current local-time? how can i achieve that moment.utc() returns the same as Date.UTC()?
为什么本地时间戳与 withMoment 不同？为什么 withMoment 返回从当前本地时间计算的时间戳？我怎样才能实现那个 moment.utc() 返回与 Date.UTC() 相同的返回值？
回答by robertklep
Call moment.utc()the same way you're calling Date.UTC:
调用moment.utc()方式与调用方式相同Date.UTC：
var withMoment = moment.utc([now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(), now.getMinutes(), now.getSeconds()]).valueOf();
I think calling moment.utc(now)will make it assume nowlives in the local timezone, and it will convert it to UTC first, hence the difference.
我认为调用moment.utc(now)会使它假设now生活在本地时区，它会首先将其转换为 UTC，因此有所不同。
回答by timrwood
What you are doing is essentially this.
你所做的基本上就是这个。
var now = new Date(2013, 02, 28, 11, 11, 11);
var native = Date.UTC(2013, 02, 28, 11, 11, 11);
console.log(now === utc); // false
console.log(now - utc); // your offset from GMT in milliseconds
Because nowis constructed in the current timezone and nativeis constructed in UTC, they will differ by your offset. 11 AM PST != 11 AM GMT.
因为now是在当前时区native中构建的，并且是在 UTC 中构建的，所以它们会因您的偏移量而有所不同。太平洋标准时间上午 11 点！= 格林威治标准时间上午 11 点。
