index.js

var formatDistanceLocale = {
  lessThanXSeconds: {
    one: {
      standalone: 'manje od 1 sekunde',
      withPrepositionAgo: 'manje od 1 sekunde',
      withPrepositionIn: 'manje od 1 sekundu',
    },
    dual: 'manje od {{count}} sekunde',
    other: 'manje od {{count}} sekundi',
  },

  xSeconds: {
    one: {
      standalone: '1 sekunda',
      withPrepositionAgo: '1 sekunde',
      withPrepositionIn: '1 sekundu',
    },
    dual: '{{count}} sekunde',
    other: '{{count}} sekundi',
  },

  halfAMinute: 'pola minute',

  lessThanXMinutes: {
    one: {
      standalone: 'manje od 1 minute',
      withPrepositionAgo: 'manje od 1 minute',
      withPrepositionIn: 'manje od 1 minutu',
    },
    dual: 'manje od {{count}} minute',
    other: 'manje od {{count}} minuta',
  },

  xMinutes: {
    one: {
      standalone: '1 minuta',
      withPrepositionAgo: '1 minute',
      withPrepositionIn: '1 minutu',
    },
    dual: '{{count}} minute',
    other: '{{count}} minuta',
  },

  aboutXHours: {
    one: {
      standalone: 'oko 1 sat',
      withPrepositionAgo: 'oko 1 sat',
      withPrepositionIn: 'oko 1 sat',
    },
    dual: 'oko {{count}} sata',
    other: 'oko {{count}} sati',
  },

  xHours: {
    one: {
      standalone: '1 sat',
      withPrepositionAgo: '1 sat',
      withPrepositionIn: '1 sat',
    },
    dual: '{{count}} sata',
    other: '{{count}} sati',
  },

  xDays: {
    one: {
      standalone: '1 dan',
      withPrepositionAgo: '1 dan',
      withPrepositionIn: '1 dan',
    },
    dual: '{{count}} dana',
    other: '{{count}} dana',
  },

  aboutXWeeks: {
    one: {
      standalone: 'oko 1 sedmicu',
      withPrepositionAgo: 'oko 1 sedmicu',
      withPrepositionIn: 'oko 1 sedmicu',
    },
    dual: 'oko {{count}} sedmice',
    other: 'oko {{count}} sedmice',
  },

  xWeeks: {
    one: {
      standalone: '1 sedmicu',
      withPrepositionAgo: '1 sedmicu',
      withPrepositionIn: '1 sedmicu',
    },
    dual: '{{count}} sedmice',
    other: '{{count}} sedmice',
  },

  aboutXMonths: {
    one: {
      standalone: 'oko 1 mjesec',
      withPrepositionAgo: 'oko 1 mjesec',
      withPrepositionIn: 'oko 1 mjesec',
    },
    dual: 'oko {{count}} mjeseca',
    other: 'oko {{count}} mjeseci',
  },

  xMonths: {
    one: {
      standalone: '1 mjesec',
      withPrepositionAgo: '1 mjesec',
      withPrepositionIn: '1 mjesec',
    },
    dual: '{{count}} mjeseca',
    other: '{{count}} mjeseci',
  },

  aboutXYears: {
    one: {
      standalone: 'oko 1 godinu',
      withPrepositionAgo: 'oko 1 godinu',
      withPrepositionIn: 'oko 1 godinu',
    },
    dual: 'oko {{count}} godine',
    other: 'oko {{count}} godina',
  },

  xYears: {
    one: {
      standalone: '1 godina',
      withPrepositionAgo: '1 godine',
      withPrepositionIn: '1 godinu',
    },
    dual: '{{count}} godine',
    other: '{{count}} godina',
  },

  overXYears: {
    one: {
      standalone: 'preko 1 godinu',
      withPrepositionAgo: 'preko 1 godinu',
      withPrepositionIn: 'preko 1 godinu',
    },
    dual: 'preko {{count}} godine',
    other: 'preko {{count}} godina',
  },

  almostXYears: {
    one: {
      standalone: 'gotovo 1 godinu',
      withPrepositionAgo: 'gotovo 1 godinu',
      withPrepositionIn: 'gotovo 1 godinu',
    },
    dual: 'gotovo {{count}} godine',
    other: 'gotovo {{count}} godina',
  },
}

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

  var result

  if (typeof formatDistanceLocale[token] === 'string') {
    result = formatDistanceLocale[token]
  } else if (count === 1) {
    if (options.addSuffix) {
      if (options.comparison > 0) {
        result = formatDistanceLocale[token].one.withPrepositionIn
      } else {
        result = formatDistanceLocale[token].one.withPrepositionAgo
      }
    } else {
      result = formatDistanceLocale[token].one.standalone
    }
  } else if (
    count % 10 > 1 &&
    count % 10 < 5 && // if last digit is between 2 and 4
    String(count).substr(-2, 1) !== '1' // unless the 2nd to last digit is "1"
  ) {
    result = formatDistanceLocale[token].dual.replace('{{count}}', count)
  } else {
    result = formatDistanceLocale[token].other.replace('{{count}}', count)
  }

  if (options.addSuffix) {
    if (options.comparison > 0) {
      return 'za ' + result
    } else {
      return 'prije ' + result
    }
  }

  return result
}