使用 Moment 将 PST 转换为 UTC？

Question

是否可以转换太平洋时间 2022 年 2 月 7 日星期一 08:30:30 下午使用 moment?

转换为 UTC 时间格式

我试过这样做

const endTime = timezone(filteredTimeLeft, "ddd, MMM DD, YYYY hh:mm:ss a").utcOffset(-8);'

但是Moment怎么知道插入的日期参数是太平洋时间呢？

Answer 1

您可以 read the documentation, which will lead you to Moment Timezone，Moment.js 的装饰器，它增加了对时区的支持。

但您可能还会注意到 Moment.js is essentially deprecated:

We now generally consider Moment to be a legacy project in maintenance mode. It is not dead, but it is indeed done.

In practice, this means:

We will not be adding new features or capabilities.

We will not be changing Moment's API to be immutable.

We will not be addressing tree shaking or bundle size issues.

We will not be making any major changes (no version 3).

We may choose to not fix bugs or behavioral quirks, especially if they are long-standing known issues.

并且您可能会考虑使用更现代的库，例如 Luxon，由 Moment 的一位维护者编写，并由 Moment 团队维护。

Answer 2

时刻是EOL so I'll start with its successor luxon。

PST 是一个不明确的时区定义，因此不受支持。如果您想要准确的偏移量，请使用 UTC-8；如果您想满足夏令时，请使用 IANA America/Los_Angeles 等。

const { DateTime } = require('luxon')
const filteredTimeLeft = "Mon, Feb 07, 2022 08:30:30 PM"

// Create a DateTime in the default zone
const local = DateTime.fromFormat(filteredTimeLeft, "EEE, MMM dd, yyyy hh:mm:ss a")
console.log(local.toLocaleString(DateTime.DATETIME_FULL))
//=> 7 February 2022, 8:30 pm GMT+1

// Set a custom zone, don't adjust the time
const local_set_pst = local.setZone("UTC-8", { keepLocalTime: true })
console.log(local_set_pst.toLocaleString(DateTime.DATETIME_FULL))
//=> 7 February 2022, 8:30 pm GMT-8

// Adjust to UTC
const pst_adjust_utc = local_set_pst.toUTC()
console.log(pst_adjust_utc.toLocaleString(DateTime.DATETIME_FULL))
//=> 8 February 2022, 4:30 am UTC

一步到位

const pst_utc = DateTime.fromFormat(
  filteredTimeLeft,
  "EEE, MMM dd, yyyy hh:mm:ss a",
  { zone: "UTC-8" }
).toUTC()
console.log(pst_utc.toLocaleString(DateTime.DATETIME_FULL))
//=> 8 February 2022, 4:30 am UTC

时刻相似，这是为什么 API 为 luxon 更改的一个很好的例子：

const moment = require('moment-timezone')
const filteredTimeLeft = "Mon, Feb 07, 2022 08:30:30 PM"

// Read time, setting a zone
const endTime = moment.tz(filteredTimeLeft, "ddd, MMM DD, YYYY hh:mm:ss a", "America/Los_Angeles")
console.log(endTime.format("ddd, MMM DD YYYY, h:mm:ss a"))
// Mon, Feb 07 2022, 8:30:30 pm

// UTC
const utcEndTime = endTime.clone().utc()
console.log(utcEndTime.format("ddd, MMM DD YYYY, h:mm:ss a"))
// Tue, Feb 08 2022, 4:30:30 am

// be careful with moment though, if you don't clone(), endTime will be modified
endTime.utc()
console.log(endTime.format("ddd, MMM DD YYYY, h:mm:ss a"))
// Tue, Feb 08 2022, 4:30:30 am

使用 Moment 将 PST 转换为 UTC？

Convert PST to UTC using Moment?

javascript

node.js

momentjs