Univ 2park/2day tick - does it expire?

[newholiday]

just looked on the back of this tick
looking for expiration date

If DH goes back for 2nd day and DS & I take that day for a Disney park will ours expire? or can we hang on to them till next vaca?

 

[mel&me]

Any tickets that do expire will have the expiration date printed on them.
If no date then they should not expire.