/**
   * Defines the magnitudes that can be added to the timestamp
   *
   * @param token token of form "[number][magnitude]" (ex. "1d")
   * @return integer indicating the magnitude of the date for the calendar system
   */
  public static ReadablePeriod getTimePeriod(String token) {
    String valString = token.substring(0, token.length() - 1);
    int value = Integer.parseInt(valString);
    char mag = token.charAt(token.length() - 1);

    ReadablePeriod period;

    switch (mag) {
      case 's':
        period = Seconds.seconds(value);
        break;
      case 'm':
        period = Minutes.minutes(value);
        break;
      case 'h':
        period = Hours.hours(value);
        break;
      case 'd':
        period = Days.days(value);
        break;
      case 'M':
        period = Months.months(value);
        break;
      case 'y':
        period = Years.years(value);
        break;
      default:
        logger.warn("Invalid date magnitude: {}. Defaulting to seconds.", mag);
        period = Seconds.seconds(value);
        break;
    }

    return period;
  }