Try to use the following functions

Year Month Day

Thanks Sami for your quick response,
The problem that I’m having is that in my family genealogy database there are some dates that are missing part or parts of the date, i.e. the month, day or both. What I would like to do is open the “DateF” by double clicking in the “LifeEventDate” field in Life Events Form. Enter the date in the proper field (Month, Day or Year) and display and store the “USD” field in the “LifeEventDate” field.

That is doable, you can always store the date in its components year, month and day. And if day and or month are missing the db still works.
You can always assemble a proper date from its components using

DatePart

Thanks Sami
This points me in the right direction.

You are welcome.
Just come back here if you need any more help.