Updating automatically Calendar and End Date (with/without wkend)

Hello - I would like to have my Calendar updated with "1's" (production days) based on the START and END DATE of that row. The START DATE is manually put in the cell and the END DATE should be calculated automatically based on the LEADTIME DAYS. There should be two options: with/whithout wkend.

See enclosed. Thanks for helping.

Please find attached formula for End date.

Regards,
Suhas