What time does Letterman tape?

Factual Questions
1

This story is in Yahoo news. Obviously Letterman is not live, but I think the following quote sounds weird, since it’s not Thursday night, yet. Why didn’t they say “today” or “this afternoon?” Can’t wait to watch, by the way!

“John McCain appeared on CBS’ “Late Show with David Letterman” Thursday night, telling the host “I screwed up” by canceling an earlier appearance on the show.”

http://news.yahoo.com/s/ap/20081016/ap_en_tv/mccain_letterman;_ylt=AoFBSXH3Ay_Tm_.u6I9IDdfK.nQA

So, what time is the show taped?

2

Last night he happened to mention that they tape at 5:30. Apparently McCain had asked him to move it up to 5:00.

3

It’s been a few years, but I attended a live taping and it started at 5:00 PM.