“What do calendars eat?”/“Dates.”

A calendar riddle is:
   
Q: What do calendars eat?
A: Dates.
   
The riddle has been cited in print since at least 2010.
   
   
Twitter
Vidhi Agrawal
@n0m_nom
What do you calendars eat? DATES
12:11 AM · Feb 15, 2010·Twitter Web Client
   
Twitter
Kara
@karahendy
What do calendars eat? DATES! imcool.
6:45 PM · Feb 16, 2010·Twitter Web Client
   
Twitter
Bárbara
@BarboUTF
What do calendars eat? .... DATES!!!! xD
11:41 PM · Feb 23, 2010·Twitter Web Client
   
Twitter
Tee
@ay0TEE
#weakjokes what do calendars eat ? *dates
1:42 AM · Mar 23, 2010·Twitter Web Client
   
Twitter
zwiebelzwiebel1
@zwiebelzwiebel1
Q: What do calendars eat?  A: Dates
11:05 AM · Sep 2, 2010·Twitter Web Client
 
Twitter
Dara Perez
@dara_perez
What do calendar eat? Dates haahahha
11:29 AM · Mar 3, 2011·Twitter for BlackBerry®
 
Twitter
Lottie Greenlees
@LottieGreenlees
Replying to @tyger
@tdh1996 what does a calendar eat? DATES!
4:54 AM · Aug 3, 2012·Twitter for iPhone
     
Twitter
Madison Inglett
@Madison_Inglett
Replying to @haleyagrant
@haleyagrant what does a calendar eat? DATES #crackmyselfup
9:50 PM · Nov 12, 2012·Twitter for iPhone
 
Twitter
Marvin Vasquez
@Marvinov11
What do calendar eat?
Dates !
5:31 AM · Jun 26, 2013·Twitter for iPhone
     
6 September 2013, Fraser Coast Chronicle (Maryborough, Queensland), pg. 16:
Q: What do calendars eat?
A: Dates.
 
Google Books
The Super, Epic, Mega Joke Book for Kids
By Whee Winn
Grand Rapids, MI: Zonderkidz
2016
Pg. ?:
What do calendars eat?
Dates.
 
Twitter
Shoshanah Shoshana Shoshanna Shoshannah Shana Lee
@ShoshanahMarohn
Q: What do calendars eat?
A: Dates.
Sorry.
#coloring #calendar http://shoshanah.space/product/artsy-fartsy-2018-colorable-calendar/
3:05 PM · Oct 26, 2017·Twitter for iPad
 
Twitter
GNolan
@GNolan01
What do calendars eat? Dates!
3:41 PM · May 14, 2021·Twitter Web App