Choose from different date formats to assign to the date field within your form

Date Format Extension
For every Date Field type you can find and enable this option in the Form > Content > Form Fields > Your Field > e-addons Tab.
Date Format
You can define your custom format compatible with FlatPickr datepicker script (used by default).
The date will be display and also submitted in this format.
NOTE: for a more secure control on the inserted date you can use it in combination with Pattern.
This is the regex compatible with the default date format: “[0-9]{4}-[0-9]{2}-[0-9]{2}”