“Every calendar’s days are numbered”

“The calendar’s days are numbered” is a jocular one-line saying that has been cited in print since at least 1899. “Every calendar’s days are numbered” was included in a popular internet list of puns in 2003. It’s likely that the 2003 author did not know about the 1899 cite and simply re-invented the pun.
 
 
6 May 1899, Millville (NJ) Evening News, pg. 1, col. 5:
The calendar’s days are numbered.
 
Chronicling America
21 December 1899, The Columbian (Bloomsburg, PA), pg. 10, col. 5:
The ‘99 calendar’s days are numbered.
 
15 October 1901, Charlotte (NC) News, pg. 7, col. 4:
The calendar’s days are numbered.
 
Google Groups: alt.gathering.rainbow
Some fishy definitions…just for the halibut….
mt ;^}
5/23/03
FOR ALL YOU LEXOPHILES, courtesy of a truly twisted friend of mine..
(...)
17. Every calendar’s days are numbered.
   
Google Groups: soc.retirement
Pun?
jim stevens
6/25/03
(...)
Every calendar’s days are numbered.
 
Google News Archive
1 May 2003, Philippine Daily Enquirer (Philippines), “On the Road” by Aida Sevilla-Mendoza, pg. B10, col. 5:
TODAY’S BUMPER STICKER: Every calendar’s days are numbered.
   
Google Books
E-Mail Humor
By Louis G. Morton
Victoria, BC: Trafford Publishing
2005
Pg. 6:
Every calendar’s days are numbered.
 
Google Books
My Little Bit of Nonsense
By Charlie Walker
Wakefield: Published by author
2008
Pg. 21:
Every calendar’s days are numbered.
 
Google Books
Blonde Walks into a Bar:
The 4,000 Most Hilarious, Gut-Busting Gags, One-Liners and Jokes
By Jonathan Swan
Berkeley, CA: Ulysses Press
2008
Pg. ?:
A calendar’s days are numbered.
   
Google Books
Once Apun A Time:
A Rich, Historical and Sometimes Earthy Collection of Puns
By Robin Leech
Victoria, BC: FriesenPress
2015
Pg. 25:
Every calendar’s days are numbered.