CODEWITHSUNDEEP
momentjsdate-fns
Nicolas Goudry
Nicolas Goudry

Reputation: 434

date-fns: Parse date string with given format

I would like to replace moment by date-fns in one of my projects.

From moment, I only use parse and timezone (with moment-timezone) functionnalities:

const moment = require('moment-timezone')

const parseDatetime = function parseDatetime (datetime, format, tz = 'Europe/Paris', locale = 'fr') {
  return +moment.tz(datetime, format, locale, tz)
}

parseDatetime('jeudi 23 janvier 13:18:23', 'dddd DD MMMM HH:mm:ss')
// => 1579781903000
// Which outputs « 2020-01-23T12:18:23.000Z » (as expected) when given to Date constructor

With date-fns, I tried format function (which seems to be what I need) :

const format = require('date-fns/format')
const fr = require('date-fns/locale/fr')

format('jeudi 23 janvier 13:18:23', 'EEEE dd MMMM HH:mm:ss', {
  locale: fr
})

First, I do not know if I should use MMMM or LLLL for month in locale format.

Anyway, I get following error :

Starting with v2.0.0-beta.1 date-fns doesn't accept strings as arguments. Please use `parseISO` to parse strings. See: https://git.io/fjule

So I went to documentation about parseISO, where it states that it will « Parse the given string in ISO 8601 format and return an instance of Date. ». This is NOT what I need, as my date string isn’t in ISO 8601 format or any other ISO format.

I found parse function, which seems to better fit my use case. So I tried :

const parse = require('date-fns/parse')
const fr = require('date-fns/locale/fr')

parse('jeudi 23 janvier 13:18:23', 'EEEE dd MMMM HH:mm:ss', Date(), {
  locale: fr
})

Which gives me the exact same error as format !!! This behavior is weird, given that parse’s documentation states that dateString argument is… a string !

So, I’m actually lost on this issue, if ever it is an issue.

Could someone please give me some help / insights about this ?

Upvotes: 3

Views: 15891

Answers (1)

djibe
djibe

Reputation: 3038

you are very close to it.

const ParseDate = require('date-fns/parse') // https://date-fns.org/docs/
const DateFrench = require('date-fns/locale/fr')
let stringDate = 'jeudi 23 janvier 13:18:23'

console.log(ParseDate(stringDate, 'EEEE dd MMMM HH:mm:ss', new Date(), { locale: DateFrench }))

=> 2020-01-23T12:18:23.000Z

Upvotes: 4

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