index.js

var distanceInWordsLocale = {
  lessThanXSeconds: {
    one: 'manj kot {{count}} sekunda',
    two: 'manj kot {{count}} sekundi',
    few: 'manj kot {{count}} sekunde',
    other: 'manj kot {{count}} sekund'
  },

  xSeconds: {
    one: '{{count}} sekunda',
    two: '{{count}} sekundi',
    few: '{{count}} sekunde',
    other: '{{count}} sekund'
  },

  halfAMinute: 'pol minute',

  lessThanXMinutes: {
    one: 'manj kot {{count}} minuta',
    two: 'manj kot {{count}} minuti',
    few: 'manj kot {{count}} minute',
    other: 'manj kot {{count}} minut'
  },

  xMinutes: {
    one: '{{count}} minuta',
    two: '{{count}} minuti',
    few: '{{count}} minute',
    other: '{{count}} minut'
  },

  aboutXHours: {
    one: 'približno {{count}} ura',
    two: 'približno {{count}} uri',
    few: 'približno {{count}} ure',
    other: 'približno {{count}} ur'
  },

  xHours: {
    one: '{{count}} ura',
    two: '{{count}} uri',
    few: '{{count}} ure',
    other: '{{count}} ur'
  },

  xDays: {
    one: '{{count}} dan',
    two: '{{count}} dni',
    few: '{{count}} dni',
    other: '{{count}} dni'
  },

  aboutXMonths: {
    one: 'približno {{count}} mesec',
    two: 'približno {{count}} meseca',
    few: 'približno {{count}} mesece',
    other: 'približno {{count}} mesecev'
  },

  xMonths: {
    one: '{{count}} mesec',
    two: '{{count}} meseca',
    few: '{{count}} meseci',
    other: '{{count}} mesecev'
  },

  aboutXYears: {
    one: 'približno {{count}} leto',
    two: 'približno {{count}} leti',
    few: 'približno {{count}} leta',
    other: 'približno {{count}} let'
  },

  xYears: {
    one: '{{count}} leto',
    two: '{{count}} leti',
    few: '{{count}} leta',
    other: '{{count}} let'
  },

  overXYears: {
    one: 'več kot {{count}} leto',
    two: 'več kot {{count}} leti',
    few: 'več kot {{count}} leta',
    other: 'več kot {{count}} let'
  },

  almostXYears: {
    one: 'skoraj {{count}} leto',
    two: 'skoraj {{count}} leti',
    few: 'skoraj {{count}} leta',
    other: 'skoraj {{count}} let'
  }
}

var distanceInWordsLocalePast = {
  lessThanXSeconds: {
    one: 'manj kot {{count}} sekundo',
    two: 'manj kot {{count}} sekundama',
    few: 'manj kot {{count}} sekundami',
    other: 'manj kot {{count}} sekundami'
  },

  xSeconds: {
    one: '{{count}} sekundo',
    two: '{{count}} sekundama',
    few: '{{count}} sekundami',
    other: '{{count}} sekundami'
  },

  halfAMinute: 'pol minute',

  lessThanXMinutes: {
    one: 'manj kot {{count}} minuto',
    two: 'manj kot {{count}} minutama',
    few: 'manj kot {{count}} minutami',
    other: 'manj kot {{count}} minutami'
  },

  xMinutes: {
    one: '{{count}} minuto',
    two: '{{count}} minutama',
    few: '{{count}} minutami',
    other: '{{count}} minutami'
  },

  aboutXHours: {
    one: 'približno {{count}} uro',
    two: 'približno {{count}} urama',
    few: 'približno {{count}} urami',
    other: 'približno {{count}} urami'
  },

  xHours: {
    one: '{{count}} uro',
    two: '{{count}} urama',
    few: '{{count}} urami',
    other: '{{count}} urami'
  },

  xDays: {
    one: '{{count}} dnem',
    two: '{{count}} dnevoma',
    few: '{{count}} dnevi',
    other: '{{count}} dnevi'
  },

  aboutXMonths: {
    one: 'približno {{count}} mesecem',
    two: 'približno {{count}} mesecema',
    few: 'približno {{count}} meseci',
    other: 'približno {{count}} meseci'
  },

  xMonths: {
    one: '{{count}} mesecem',
    two: '{{count}} mesecema',
    few: '{{count}} meseci',
    other: '{{count}} meseci'
  },

  aboutXYears: {
    one: 'približno {{count}} letom',
    two: 'približno {{count}} letoma',
    few: 'približno {{count}} leti',
    other: 'približno {{count}} leti'
  },

  xYears: {
    one: '{{count}} letom',
    two: '{{count}} letoma',
    few: '{{count}} leti',
    other: '{{count}} leti'
  },

  overXYears: {
    one: 'več kot {{count}} letom',
    two: 'več kot {{count}} letoma',
    few: 'več kot {{count}} leti',
    other: 'več kot {{count}} leti'
  },

  almostXYears: {
    one: 'skoraj {{count}} letom',
    two: 'skoraj {{count}} letoma',
    few: 'skoraj {{count}} leti',
    other: 'skoraj {{count}} leti'
  }
}

var distanceInWordsLocaleFuture = {
  lessThanXSeconds: {
    one: 'manj kot {{count}} sekundo',
    two: 'manj kot {{count}} sekundi',
    few: 'manj kot {{count}} sekunde',
    other: 'manj kot {{count}} sekund'
  },

  xSeconds: {
    one: '{{count}} sekundo',
    two: '{{count}} sekundi',
    few: '{{count}} sekunde',
    other: '{{count}} sekund'
  },

  halfAMinute: 'pol minute',

  lessThanXMinutes: {
    one: 'manj kot {{count}} minuto',
    two: 'manj kot {{count}} minuti',
    few: 'manj kot {{count}} minute',
    other: 'manj kot {{count}} minut'
  },

  xMinutes: {
    one: '{{count}} minuto',
    two: '{{count}} minuti',
    few: '{{count}} minute',
    other: '{{count}} minut'
  },

  aboutXHours: {
    one: 'približno {{count}} uro',
    two: 'približno {{count}} uri',
    few: 'približno {{count}} ure',
    other: 'približno {{count}} ur'
  },

  xHours: {
    one: '{{count}} uro',
    two: '{{count}} uri',
    few: '{{count}} ure',
    other: '{{count}} ur'
  },

  xDays: {
    one: '{{count}} dan',
    two: '{{count}} dni',
    few: '{{count}} dni',
    other: '{{count}} dni'
  },

  aboutXMonths: {
    one: 'približno {{count}} mesec',
    two: 'približno {{count}} meseca',
    few: 'približno {{count}} mesece',
    other: 'približno {{count}} mesecev'
  },

  xMonths: {
    one: '{{count}} mesec',
    two: '{{count}} meseca',
    few: '{{count}} meseci',
    other: '{{count}} mesecev'
  },

  aboutXYears: {
    one: 'približno {{count}} leto',
    two: 'približno {{count}} leti',
    few: 'približno {{count}} leta',
    other: 'približno {{count}} let'
  },

  xYears: {
    one: '{{count}} leto',
    two: '{{count}} leti',
    few: '{{count}} leta',
    other: '{{count}} let'
  },

  overXYears: {
    one: 'več kot {{count}} leto',
    two: 'več kot {{count}} leti',
    few: 'več kot {{count}} leta',
    other: 'več kot {{count}} let'
  },

  almostXYears: {
    one: 'skoraj {{count}} leto',
    two: 'skoraj {{count}} leti',
    few: 'skoraj {{count}} leta',
    other: 'skoraj {{count}} let'
  }
}

function getFormFromCount(count) {
  switch (count % 100) {
    case 1:
      return 'one'
    case 2:
      return 'two'
    case 3:
    case 4:
      return 'few'
    default:
      return 'other'
  }
}

export default function formatDistance(token, count, options) {
  options = options || {}

  var localeObject = distanceInWordsLocale
  var result = ''

  if (options.addSuffix) {
    if (options.comparison > 0) {
      localeObject = distanceInWordsLocaleFuture
      result += 'čez '
    } else {
      localeObject = distanceInWordsLocalePast
      result += 'pred '
    }
  }

  if (typeof localeObject[token] === 'string') {
    result += localeObject[token]
  } else {
    var form = getFormFromCount(count)
    result += localeObject[token][form].replace('{{count}}', count)
  }

  return result
}