In article .com,
utguy53 wrote:

I would like to connect an existing outdoor outlet to a GFCI circuit that
is on a timer during the Christmas season. I was considering using a three
way switch to toggle between the hot side of the two circuits. Will this
work? Is there a better way to do this?

UTguy53-

Consider extending the GFCI circuit permanently. That way you will not
have to worry about different current paths tripping the GFCI. (I
understand recent electrical codes require outdoor outlets to be GFCI.)

If you do that, you could use a switch to bypass the timer.

Fred