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Filling in a DateTime from a Pick List


I'm toying around with something.  I've got two pick lists -- one that represents a day, and another that represents a small selection of times.

What I'd like to do is find a way to combine those two to fill out a third datetime field.  I think I'd need a trigger (instead of a workflow rule) in order to best do this.  But I'm not quite sure what would be the best way to go about this, especially as I come up to speed on the various Apex syntax.

Why wouldn't you just use a forumla field to pull those values and make a read only field with the date?
That very much may be the solution -- I'm struggling a bit with getting datetime values from picklist values though. 
I couldn't find a way to build a date-time value in a formula, but I could create a new date from an Apex trigger, and that worked.