Parse & sum ISO 8601 duration to date

Example

import { duration } from 'iso-duration'

const dayBefore = duration('-P1D')

const { negative, year, month, week, day, hour, minute, second } = dayBefore
console.log({ negative, year, month, week, day, hour, minute, second })
// output parsed values: { negative: true, year: 0, month: 0, week: 0, day: -1, hour: 0, minute: 0, second: 0 }

const yesterday = dayBefore(new Date())
// today's Date less 1 day

API

duration

Higher order function duration argument must be a valid ISO 8601 duration string formated as PnYnMnDTnHnMnS or PnW (n being integer).

It returns a function to sum parsed duration to given date (accorging duration sign), decorated with parsed values.

Throws an Error when it cannot parse the value.

• date & time durations

const inTreeDaysAndTwelveHours = duration('P3DT12H')(new Date())

• substract & negative durations

const yesterday = duration('-P1D')(new Date())
const alsoYesterday = duration('P1D')(new Date(), { substract: true })
const stillYesterday = duration('-P1D')(new Date(), { substract: true })

• week durations

const inTwoWeeks = duration('P2W')(new Date())
const twoWeeksAgo = duration('-P2W')(new Date())

• strict option set as false (default behavior)

const tomorrow = duration('P1D')(new Date())

Time in the day won't be affected by daylight saving time (DST)

Time interval between the date given and returned may be affected by DST and not equal to duration

• strict option set as true

const tomorrow = duration('P1D')(new Date(), { strict: true })

Time in the day may be affected by daylight saving time (DST)

Time interval between the date given and returned will be stricly equal to duration

How to report bugs or questions?

• If you find any issues, please open a bug issue with the bug description as detailed as possible.
• You may also ask simple question.

How to make contributions?

Please read and follow the steps in the Contributing guide.

License

Released under The MIT License.

Code of conduct

This project adheres to the Contributor Covenant code of conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to a.gibrat@oodrive.com.

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