code: function findShallowIntersectingRange(date1, date2) {
    const thisRange = date1.toRange();
    const otherRange = date2.toRange();
    // Start with infinite start and end dates
    let start = null;
    let end = null;
    // This start date exists
    if (thisRange.start) {
      // Use this definite start date if other start date is infinite
      if (!otherRange.start) start = thisRange.start;
      else
        // Otherwise, use the earliest start date
        start =
          thisRange.start < otherRange.start ? thisRange.start : otherRange.start;
      // Other start date exists
    } else if (otherRange.start) {
      // Use other definite start date as this one is infinite
      start = otherRange.start;
    }
    // Assign end date to this one if it is valid
    if (thisRange.end && (!start || thisRange.end >= start)) {
      end = thisRange.end;
    }
    // Assign end date to other one if it is valid and before this one
    if (otherRange.end && (!start || otherRange.end >= start)) {
      if (!end || otherRange.end < end) end = otherRange.end;
    }
    // Return calculated range
    return { start, end };
  }
docs: Returns a date range that intersects two date info objects NOTE: This is a shallow calculation (does not take patterns into account), so this method should only really be called for special conditions where absolute accuracy is not necessarily needed