Reset Date Field module provides the "Reset" button just next/below Date Field. On click on reset button date, date time, created date get rest with default empty.

To configure this module:

Enable the module, installation of this module is similar to any other module in drupal

drush en reset_date_field

Go to content type form display, select widget or type "Reset Date Field Type" and save the form. Then visit to your content type and check date field, Reset button appears next to date field.