如何将 Moment.js 日期转换为用户的本地时区？

我使用 Moment.js 和 Moment-Timezone 框架，并且有一个 Moment.js 日期对象，它显式位于 UTC 时区。如何将其转换为浏览器的当前时区？

var testDateUtc = moment.tz("2015-01-30 10:00:00", "UTC");
var localDate = ???

所以，如果我能找出用户的本地时区，或者我想将日期对象转换成另一个数据对象，它只使用“本地时区”，不管它实际上是什么。

165544 次浏览
小开

You do not need to use moment-timezone for this. The main moment.js library has full functionality for working with UTC and the local time zone.

var testDateUtc = moment.utc("2015-01-30 10:00:00");
var localDate = moment(testDateUtc).local();

From there you can use any of the functions you might expect:

var s = localDate.format("YYYY-MM-DD HH:mm:ss");
var d = localDate.toDate();
// etc...

Note that by passing testDateUtc, which is a moment object, back into the moment() constructor, it creates a clone. Otherwise, when you called .local(), it would also change the testDateUtc value, instead of just the localDate value. Moments are mutable.

Also note that if your original input contains a time zone offset such as +00:00 or Z, then you can just parse it directly with moment. You don't need to use .utc or .local. For example:

var localDate = moment("2015-01-30T10:00:00Z");
小开

Use utcOffset function.

var testDateUtc = moment.utc("2015-01-30 10:00:00");
var localDate = moment(testDateUtc).utcOffset(10 * 60); //set timezone offset in minutes
console.log(localDate.format()); //2015-01-30T20:00:00+10:00
小开 
var dateFormat = 'YYYY-DD-MM HH:mm:ss';
var testDateUtc = moment.utc('2015-01-30 10:00:00');
var localDate = testDateUtc.local();
console.log(localDate.format(dateFormat)); // 2015-30-01 02:00:00
  1. Define your date format.
  2. Create a moment object and set the UTC flag to true on the object.
  3. Create a localized moment object converted from the original moment object.
  4. Return a formatted string from the localized moment object.

See: http://momentjs.com/docs/#/manipulating/local/

小开

Here's what I did:

var timestamp = moment.unix(\{\{ time }});
var utcOffset = moment().utcOffset();
var local_time = timestamp.add(utcOffset, "minutes");
var dateString = local_time.fromNow();

Where \{\{ time }} is the utc timestamp.

小开 

class Time extends React.Component {
constructor(props) {
super(props)
this.state = {
parentTime: '',
localTime: '',
parentTz: ''
}
}


componentDidMount() {
const inputTz = "America/Toronto"
const originTime = "2013-11-18 11:55"
const time = moment.tz(originTime, inputTz)
const localtz = moment.tz.guess()
const date = time.clone().tz(localtz)
const formatDate = moment(date).format('MMMM Do YYYY, h:mm:ss A z')
console.log(formatDate, localtz)
this.setState({parentTime: originTime, localTime: formatDate, parentTz: inputTz })
}




render() {
const {parentTime, parentTz, localTime} = this.state
return (
<div>
<p>{parentTime}<br/> in {parentTz}<br/> to {localTime}</p>
</div>
)
}
}




ReactDOM.render(
<Time />,
document.getElementById('time')
);
<script src="https://momentjs.com/downloads/moment.js"></script>
<script src="https://momentjs.com/downloads/moment-timezone.js"></script>
<script src="https://momentjs.com/downloads/moment-timezone-with-data-1970-2030.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/15.3.0/react-dom.min.js"></script>
<div id="time"></div>

the best way to get a user's time zone is using moment-timezone

import moment from 'moment-timezone'


// using utc time here
const time = moment.tz("2021-04-14T02:08:10.370Z")
const localtz = moment.tz.guess()
const date = time.clone().tz(localtz)
const formatDate = moment(date).format('MMMM Do YYYY, h:mm:ss A z')
console.log(formatDate)

this way you will be able to convert your time into a local timezone specific time


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