number_suffix_helper/index.js

Helper that will allow you to get the day suffix for a given day number x where 1 <= x <= 31.

exports.getDayEndingFromNumber = function (date, defaultValue) {
    defaultValue = (defaultValue === undefined) ? '' : defaultValue
    switch (date) {
      case 1:
      case 21:
      case 31:
          return 'st'
      case 2:
      case 22:
          return 'nd'
      case 3:
      case 23:
          return 'rd'
      case 4:
      case 5:
      case 6:
      case 7:
      case 8:
      case 9:
      case 10:
      case 11:
      case 12:
      case 13:
      case 14:
      case 15:
      case 16:
      case 17:
      case 18:
      case 19:
      case 20:
      case 24:
      case 25:
      case 26:
      case 27:
      case 28:
      case 29:
      case 30:
          return 'th'
      default:
          return defaultValue
  }
}