@tehshrike/duration-iso-8601/index.js

Parse ISO 8601 Duration(PnYnMnDTnHnMnS syntax)

const durationRegExp = /^P(?:(\d+(?:[\.,]\d+)?)Y)?(?:(\d+(?:[\.,]\d+)?)M)?(?:(\d+(?:[\.,]\d+)?)D)?(?:T(?:(\d+(?:[\.,]\d+)?)H)?(?:(\d+(?:[\.,]\d+)?)M)?(?:(\d+(?:[\.,]\d+)?)S)?)?$/

const indexes = {
	1: 'year',
	2: 'month',
	3: 'day',
	4: 'hour',
	5: 'minute',
	6: 'second',
}

module.exports = (duration) => {
	const matchResult = duration.match(durationRegExp)

	if (matchResult === null) {
		return null
	}

	const durationResult = {}

	for (let matchResultIndex = 1; matchResultIndex <= Math.min(matchResult.length, 6); matchResultIndex++) {
		if (matchResult[matchResultIndex] !== undefined) {
			const value = Number(matchResult[matchResultIndex].replace(',', '.'))

			if (Number.isNaN(value)) {
				return
			}

			durationResult[indexes[matchResultIndex]] = value
		}
	}

	if (Object.keys(durationResult) === 0) {
		return null
	}

	return durationResult
}