Originally reported in #2099, the CreationTime for CF stacks was hardcoded. This was fixed in in LocalStack itself (#2103), but is now also fixed in moto (getmoto/moto#2818).

I don't know what version of moto you're using, and whether it's acceptable to use dev-releases, but if you do:

moto 1.3.15.dev550 should fix this issue, so the LS fix can be removed if you upgrade :)