Somehow it seems like it was 23rd-25th.

Edit: Nope, Wells says in TF,

You see, the twenty-second century
is a peaceful, harmonious Utopia.
No violence, no crime. Without
preparation, poor Tempus would be
horrified by the savagery of the
1990s...

Course, we all know how "horrified" he was.

Which makes me think. Why didn't Wells just take Tempus back to before he had taken him back in time, and done that memory erase thing. Then Tempus would never become a villain.

I think, therefore, I get bananas.

When in doubt, think about time travel conundrums. You'll confuse yourself so you can forget what you were in doubt about.

What's the difference between ignorance, apathy, and ambivalence?
I don't know and I don't care one way or the other.