Parse ISO8601 time string

date-format.js

const objMap = ['years', 'months','days', 'hours', 'minutes', 'seconds'];
const numbers = '\\d+(?:[\\.,]\\d{0,3})?';
const datePattern = `(${numbers}Y)?(${numbers}M)?(${numbers}D)?`;
const timePattern = `T(${numbers}H)?(${numbers}M)?(${numbers}S)?`;
const pattern = new RegExp(`P(?:${datePattern}(?:${timePattern})?)`);

export function parseISO8601TimePattern(durationString) {
  // https://github.com/tolu/ISO8601-duration/blob/master/src/index.js
  return durationString.match(pattern).slice(1).reduce((prev, next, idx) => {
    prev[objMap[idx]] = parseFloat(next) || 0;
    return prev
  }, {});
}