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factory.js

const calculateDelta = (now, date) => Math.round(Math.abs(now - date) / 1000)

export default function relativeDateFactory (translations) {
  return function relativeDate (date, now = new Date()) {
    if (!(date instanceof Date)) {
      date = new Date(date)
    }

let delta = null

const minute = 60
    const hour = minute * 60
    const day = hour * 24
    const week = day * 7
    const month = day * 30
    const year = day * 365

delta = calculateDelta(now, date)

if (delta > day && delta < week) {
      date = new Date(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0)
      delta = calculateDelta(now, date)
    }

const translate = (translatePhrase, timeValue) => {
      let key

if (translatePhrase === 'justNow') {
        key = translatePhrase
      } else if (now >= date) {
        key = `${translatePhrase}Ago`
      } else {
        key = `${translatePhrase}FromNow`
      }

const translation = translations[key]

if (typeof translation === 'function') {
        return translation(timeValue)
      }

return translation.replace('{{time}}', timeValue)
    }

switch (false) {
      case !(delta < 30):
        return translate('justNow')

case !(delta < minute):
        return translate('seconds', delta)

case !(delta < 2 * minute):
        return translate('aMinute')

case !(delta < hour):
        return translate('minutes', Math.floor(delta / minute))

case Math.floor(delta / hour) !== 1:
        return translate('anHour')

case !(delta < day):
        return translate('hours', Math.floor(delta / hour))

case !(delta < day * 2):
        return translate('aDay')

case !(delta < week):
        return translate('days', Math.floor(delta / day))

case Math.floor(delta / week) !== 1:
        return translate('aWeek')

case !(delta < month):
        return translate('weeks', Math.floor(delta / week))

case Math.floor(delta / month) !== 1:
        return translate('aMonth')

case !(delta < year):
        return translate('months', Math.floor(delta / month))

case Math.floor(delta / year) !== 1:
        return translate('aYear')

default:
        return translate('overAYear')
    }
  }
}

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