Are there any time-based events?

In Fallout New Vegas, do I have to keep an eye on the time/date? Are there any events that happen after a certain amount of ingame time?

Can you for example miss something if you arrive to late in a certain place or don't finish a quest until a specific day?

I remember that in Fallout 1 or 2 (or both?) you were on a deadline and things could happen in the world without your interaction.

Solution 1:

For the most part no. Some events will only resolve after a certain amount of time has been passed from a trigger, and you may occasionally need to let 3 days pass (or just wait in place 3 days) for a script reset or merchant restock, but there are no 'scheduled events' which require actual attention to the calendar.

A few quests can only be completed at night, or during the day, or at a certain time of day, but you can't 'miss' them, you'll merely need to wait for the time to roll around again.

Solution 2:

Yes, there is one quest at Camp McCarran.

You need to find and disable an explosive before time runs out.