“What four days start with the letter ‘T’?” (riddle)

A riddle about the days is:
 
Q: What four days start with the letter “T”?
A: Tuesday, Thursday, today and tomorrow.
 
The riddle has been cited in print since at least 2002.
 
   
Google Books
Dude, Got Another Joke?
By Bob Phillips  
Eugene, OR: Harvest House Publishers
2002
Pg. 149:
Teacher: Can you name four days of the week beginning with the letter “T”?
Pupil: Tuesday, Thursday, Today, and Tomorrow!
 
Google Books
Cool Parent 101:
Fun Things to Make Your Kid Say Wow!
By Alecia T. Devantier and Carol A. Turkington
Naperville, IL: Sourcebooks
2004
Pg. 18:
Name the four days that begin with the letter “T. ”
Tuesday, Thursday, today, and tomorrow.
 
Google Books
Gonzalo Garza, a Texas legend:
Pasó por aquí
By Gonzalo Garza
Georgetown, TX: WordWright.biz
2005
Pg. 299:
Then I’d say, “I think four days start with the letter T. Do you know what they are?”
 
Of course they never did, so I told them, very slowly, “Four days of the week starts with the letter T. Tuesday, Thursday, Today and Tomorrow.”
 
Twitter
RoundoElko
‏@RoundoElko
Who can name four days that start with the letter “T”?
9:25 AM - 3 Sep 2008
     
Google Groups: Americas-Graffitti
LILLI’S SCRAPBOOK PAGES Tuesday 4/28/09
peggy
4/28/09
(...)
Tuesday’s Brain Teaser
Can you name four days which start with the letter “T”?
(...)
Answer to today’s brain teaser
Tuesday, Thursday, today, and tomorrow!
 
Twitter
Sam Carter
‏@MK_OfficialPage
Can you name four days which start with the letter “T”’?
A: Tuesday, Thursday…....Today and Tomorrow #RT
6:38 PM - 21 May 2010
 
Google Books
Best Ever Classroom Jokes:
Because some of us never grow up
By Mike Haskins
New York, NY: Pavilion Books
2015
Pg. ?:
Name four days of the week that start with the letter ‘T’?
Tuesday, Thursday, Today and Tomorrow