Please add
lost_focus
and
pressed_enter
to datepicker as built in events
The change event triggers, as soon as you click on the day, before you have clicked on the month and year. Since the day is the main part the user will see when they click on a datepicker field, its highly likely they will choose the day first, then go in and find the correct month/year which are small drop downs.
I appreciate that the user can change it again, but if you set an event that creates or updates or adds to something, then you have to undo that before re-doing it again and its a lot more work than just being able to use a pressed_enter.