See attached booking form that is part of a drupal application. The user selects an arrival date and then when they click into the departure date field it inserts a date that is 2 days later.
1) user cannot select booking dates that are in the past (incl the current day)
2) user cannot select booking dates that are less than 2 days in the future. For example if today is 11 July, they can only select an arrival date of 13 July.
Freelancer can make code additions in this file and I can test within Drupal app.