Difference between two dates JS

diffDate.js

function diffDate(dateInit, dateEnd) {
  const d1 = new Date(dateInit).getTime()
  const d2 = new Date(dateEnd).getTime()

  if (d1 === d2) {
    return {
      'TotalDays' : 0,
      'Result'    : 'The two dates are the same.'
    }
  } else {
    const diff = d1 > d2 ? new Date(d1 - d2) : new Date(d2 - d1)
    const date = `${diff.getUTCFullYear()}-${diff.getMonth() + 1}-${diff.getDate()}`

    const days   = parseInt(Math.abs(date.split('-')[2]))
    const months = parseInt(Math.abs(date.split('-')[1]) - 1)
    const years  = parseInt(Math.abs(date.split('-')[0]  - 1970))

    const dayTxt   = ['day',   'days']
    const monthTxt = ['month', 'months']
    const yearTxt  = ['year',  'years']

    return {
      'TotalDays' : Math.round((years * 365) + (months * 30.417) + days),
      'Result'    : `${years} ${years === 1 ? yearTxt[0] : yearTxt[1]} ${months} ${months === 1 ? monthTxt[0] : monthTxt[1]} and ${days} ${days === 1 ? dayTxt[0] : dayTxt[1]}`
    }
  }
}