static fromSeconds(seconds, options = {}) {
    if (!isNumber(seconds)) {
      throw new InvalidArgumentError("fromSeconds requires a numerical input");
    } else {
      return new DateTime({
        ts: seconds * 1000,
        zone: normalizeZone(options.zone, Settings.defaultZone),
        loc: Locale.fromObject(options),
      });
    }
  }
Create a DateTime from a number of seconds since the epoch (meaning since 1 January 1970 00:00:00 UTC). Uses the default zone.
@param {number} seconds - a number of seconds since 1970 UTC
@param {Object} options - configuration options for the DateTime
@param {string|Zone} [options.zone='local'] - the zone to place the DateTime into
@param {string} [options.locale] - a locale to set on the resulting DateTime instance
@param {string} options.outputCalendar - the output calendar to set on the resulting DateTime instance
@param {string} options.numberingSystem - the numbering system to set on the resulting DateTime instance
@param {string} options.weekSettings - the week settings to set on the resulting DateTime instance
@return {DateTime}