function getTopOfHourDateString_() {
  const date = new Date();
  date.setHours(date.getHours() + 1);
  date.setMinutes(0, 0, 0);
  // Adding the date as string might lead to an incorrect response due to time zone adjustments.
  return Utilities.formatDate(date, Session.getScriptTimeZone(), 'MM/dd/yyyy H:mm');
}
Gets the current date and time for the upcoming top of the hour (e.g. 01/25/2022 18:00).
@return {string} date/time in mm/dd/yyy HH:MM format needed for use by Calendar