My visa confirmation looks like it is not for the travel dates I gave. It says something like "good until December something" so I am inferring that it will be 60 days from my stamp date. I've landed at 11:30 and am going to loiter 30 minutes and see if it results in an extra day.
TLDR : Answer Summary
The visa confirmation indicates it is valid for 90 days from the issue date, not necessarily aligned with your travel dates. If your landing is around midnight, the entry stamp's effective date may shift to the next day. Additionally, a tourist visa must be utilized within three months from the date it was issued, and upon arrival, you will typically receive a 60-day stay. Make sure to travel before the visa expiry date shown on your confirmation.