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  /*** Total Seconds (i.e. that can be > 24 hours) ***/

  inline constexpr double SECONDS_IN_DAY = 24 * 60 * 60;

  /**
   * @param seconds the total seconds
   * @return the SCDateTime value
   */
  inline SCDateTime fromSeconds(int64_t seconds) {
    return SCDateTime{ seconds / SECONDS_IN_DAY };
  }

  /**
   * @param dt the SCDateTime
   * @return the SCDateTime value as total seconds
   */
  inline int64_t seconds(const SCDateTime& dt) {
    return static_cast<int64_t>( dt.GetAsDouble() * SECONDS_IN_DAY);
  }

  /**
   * @param dt1 the first SCDateTime
   * @param dt2 the second SCDateTime
   * @return the number of seconds between dt1 and dt2
   * - positive if dt1 is later than dt2, negative if dt1 is earlier than dt2
   */
  inline int seconds(const SCDateTime& dt1, const SCDateTime& dt2) {
    return static_cast<int>( seconds(dt1) - seconds(dt2) );
  }