Norwegian date and time strings with leading zero

datestrings.js

function datestrings (date) {
  const format = ['year', 'month', 'day', 'hour', 'minute', 'second']
  const parts = date
    .toISOString()
    .split(/[^\d]/g)
    .slice(0, format.length)
    .reduce((obj, part, i) => {
      obj[format[i]] = part
      return obj
    }, {})

  const withLeadingZero = (num) => ('0' + num).slice(-2)
  const arr = Object.keys(parts).map(key => parts[key])
  return {
    parts,
    dateString: arr.splice(0, 3).reverse().map(withLeadingZero).join('/'),
    timeString: arr.map(withLeadingZero).join(':')
  }
}

var d = parsedate(new Date())

returns

{ parts: 
   { year: '2017',
     month: '06',
     day: '04',
     hour: '23',
     minute: '12',
     second: '42',
     undefined: '491' },
  dateString: '04/06/17',
  timeString: '23:12:42:91' }