How to break date down to a month value and a year

Hi,

Need to read a datetime from an entity (table) and split it so we can populate the values into a dropdown of month choices (1-12) and a dropdown of Year choices when the form loads.
ie. when this form loads it needs to display the last saved values in each of the dropdowns:
When the values were last saved they were concatenated into MM/15/YYYY and that full date saved as a datetime dataype in one field.

How can we accomplish this?

Thank you.