How to format as UTC string with date-fns library?-CodePudding

In date-fns library I do this

var from = new Date();
format(from, "MMMM d, yyyy");

However this gives me the localized value similarly as to if I did new Date().toString(). I am looking for the equivalent of new Date().toUTCString(). How can I format in date-fns to UTC string?

CodePudding user response：

You can use formatInTimeZone from date-fns-tz to output the date in UTC:

let { format  } = require('date-fns');
let { formatInTimeZone } = require('date-fns-tz');

var from = new Date();

console.log('Local time:', format(from, 'HH:mm, MMMM d, yyyy'))
console.log('UTC:', formatInTimeZone(from, 'UTC',  'HH:mm, MMMM d, yyyy'))

This will output something like:

 Local time: 08:23, December 6, 2022
 UTC: 16:23, December 6, 2022

CodePudding user response：

To format a date in date-fns as a UTC string, you can use the format function and pass in the 'UTC' option as the second argument. Here's an example:

import { format } from 'date-fns'

const date = new Date()
const utcString = format(date, 'UTC')

This will format the given date object as a UTC string in the format 'YYYY-MM-DDTHH:mm:ss.SSS[Z]', which is the same format as the toUTCString() method of the Date object in JavaScript.