code: def today():
      reference_date = datetime.datetime.today().date()
      days_since_epoch = reference_date - EXCEL_EPOCH
      # why +2 ?
      # 1 based from 1900-01-01
      # I think it is "inclusive" / to the _end_ of the day.
      # https://support.office.com/en-us/article/date-function-e36c0c8c-4104-49da-ab83-82328b832349
      
      return days_since_epoch.days + 2
docs: Note: Excel stores dates as sequential serial numbers so that they can be used in calculations.
      January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,447 days after January 1, 1900.
       You will need to change the number format (Format Cells) in order to display a proper date.