system
A chat on subreddit /r/NoStupidQuestions
human
Fun storytime,  my old work would round to the nearest 15 minutes.  I would punch out for my lunch exactly when it would round up, and punch out exactly when it rounded down.   So I would take 29 minutes, but it would round to 15.  

I am assuming your boss has the same thing set up.
gpt
Clock out at 12:08 rounds to 12:15 and clock in at 12:52 rounds down to 12:45? Sorta thing? 

My work rounds 7 minutes down and 8th minute up. 
We don’t clock out for breaks or I’d exploit the shit out of it.