Universal ticket question

[disneyfan2]

If i buy a one day pass can i upgrade when i am there to 2 day or 2 park option after the fact?

 

[damo]

You sure can. Just make sure you do it that day.

 

[Metro West]

If i buy a one day pass can i upgrade when i am there to 2 day or 2 park option after the fact?

Make sure you upgrade before leaving the park or your ticket is considered used.