“Sitting on the toilet as the clock struck midnight, I thought, ‘Same shit, different day’”

The expression “same shit, different day” is not meant to be taken literally. A joke was posted on the newsgroup alt.tasteless on September 11, 1999:
 
“Y’know, it just occurs to me. . .what if you get on the toilet just before midnight, take a crap, and finish after midnight? Then you’d have the same shit, different day.”
 
“‘Same shit, different day’ - person who is on the toilet bowl from 11:59 PM until 12:01 AM” was posted on Twitter on April 24, 2012. “Last night, I was sitting on the toilet at 11:59 p.m. and the clock struck midnight. I thought, ‘Same shit, different day’” was posted on Reddit—Dad Jokes on May 7, 2018.
 
         
Google Groups: alt.tasteless
Same Shit, Different Day [REPOST] (Was: Turd Story) 
Jane
9/11/99
Y’know, it just occurs to me. . .what if you get on the toilet just before midnight, take a crap, and finish after midnight?
Then you’d have the same shit, different day.
   
Google Groups: alt.tasteless
Apeshit alert: Dung kills 3 in horsepistol
Jonathan Blaque
9/16/99
(...)
“Y’know, it just occured to me… what if you get on the toilet just before midnight, take a crap, and finish after midnight? ... Then you’d have the same shit, different day.”
—Jane
   
Twitter
Mark Macaluso
@MarkAMacaluso
“Same shit, different day” - person who is on the toilet bowl from 11:59 PM until 12:01 AM
5:41 PM - 24 Apr 2012
   
Twitter
Vaughan White
@ploddles
As I sat on the toilet last night I noticed the clock turn midnight.
Same shit, different day.
3:52 AM - 15 May 2012
 
Reddit—Jokes
I was sitting on the toilet at 11:59 pm
submitted August 19, 2015 by brittanylove420
The clock turned to 12:00 and I thought to myself, “Same shit, different day.”
   
Twitter
Joke Authority
@JokeAuthority
I was sitting on the toilet at 11:59 p.m. The clock turned to 12:00 and I thought to myself, “Same shit, different day.”
1:14 PM - 29 Aug 2015
 
Twitter
Ap Fabrication
@ap_fab
I was sitting on the toilet at 11:59 p.m. The clock turned to 12:00 and I thought to myself, “Same shit, different day.”
8:07 AM - 25 Mar 2016
 
Reddit—Dad Jokes
Last night, I was sitting on the toilet at 11:59 p.m. and the clock struck midnight. (self.dadjokes)
submitted May 7, 2018 by porichoygupto
I thought, “Same shit, different day.”