Parsing

Parsing is similar to formatting, the same DateTimeFormatter pattern are used as for formatting.

Check Formatting page for a list of available patterns

js-joda build-in DateTimeFormatter parses and formats dates and times from /to ISO 8601 as specified in RFC 3339.

Customized parser can be build with the DateTimeFormatter.

Simple parser example

import { DateTimeFormatter, LocalDate } from '@js-joda/core';

const formatter = DateTimeFormatter.ofPattern('M/d/yyyy');
const date = LocalDate.parse('4/28/2018');
console.log(date.toString()); // 2018-04-28

http date parser example

HTTP dates as specified in RFC 7321 and return by javascript native Date toUTCString method, requires the local package.

import { DateTimeFormatter, ZonedDateTime } from '@js-joda/core';
import '@js-joda/timezone'
import { Locale } from '@js-joda/locale';

const df = DateTimeFormatter.ofPattern('EEE, dd MMM yyyy HH:mm:ss z').withLocale(Locale.ENGLISH);
const z = ZonedDateTime.parse('Tue, 05 Oct 2021 17:08:24 GMT', df);
console.log(z.toString()); // 2021-10-05T17:08:24+01:00[GMT]

Hint

Whenever you stumble over a Cannot read property 'localeString' of null error, its probably because the local for formatter is not set. In that case add the locale package to your project and set the locale for the formatter, eg DateTimeFormatter.ofPattern('eeee (d MMMM)').withLocale(Locale.FRANCE).