A small (< 1kb minified + gzipped) javascript package to parse and serialize ISO-8601 durations. This package does only 2 things:

1. It parses a duration string to an object
   • (e.g. P1DT12H to { days: 1, hours: 12 })
2. The reverse, i.e. serialize an object to a string.

This lib has 0 dependencies.

• NPM: npm install --save tinyduration
• Yarn: yarn add tinyduration

import { parse, serialize } from 'tinyduration'

// Basic parsing
const durationObj = parse('P1Y2M3DT4H5M6S')
assert(durationObj, {
    years: 1,
    months: 2,
    days: 3,
    hours: 4,
    minutes: 5,
    seconds: 6,
})

// Serialization
assert(serialize(durationObj), 'P1Y2M3DT4H5M6S')

This library is written in TypeScript. During publication of the package, the code is transpiled to javascript and put into the dist folder.

The tests can be found the src folder under *.test.ts, testing is done using Jest

Additional commands you'll need for development:

• npm test to run all tests
• npm run lint to run the linter
• npm run prettify to auto-fix the indenting issues
• npm run ci to run coverage and linting
• npx changeset to add a changeset
• npx changeset version to adopt a changeset, prepping for release
• npx changeset publish to publish to NPM

parse accepts a string and returns a Duration object.

No attempt is made to change lower units into higher ones, e.g. to change 120 minutes into 2 hours.

Throws InvalidDurationError if an invalid duration string is supplied.

Throws MultipleFractionsError if an the duration string contains multiple fractions while disabled in the config. According to the spec multiple fractions are not allowed. Currently this is not enforced and the allowMultipleFractions config parameter defaults to true.

import { parse } from 'tinyduration'

const duration = parse('P1W')
assert(duration, { weeks: 1 })

try {
    parse('invalid-duration')
} catch (e) {
    assert(e.message === 'Invalid duration')
}

serialize accepts a Duration object and returns a serialized duration according to ISO-8601.

If the duration is empty (i.e. all values are 0), PT0S is returned.

import * as Duration from 'tinyduration'

const durationStr = Duration.serialize({ weeks: 1 })
assert(durationStr, 'P1W')

const durationStr = Duration.serialize({})
assert(durationStr, 'PT0S')

MIT