Eugene 
Lol, this is unexpected and sad 
Installed "file-attributes" library to retrieve ctime from files and got "Not implemented"
BTW, SBCLs "(sb-posix:stat-ctime (sb-posix:stat filename))" somehow returns wrong ctime — I got 1956 as a file creation year, while IRL it is equal to 2026
Dave Tenny@evgandr How are you interpreting the result of ctime? It wouldn't be compatible with lisp universal times which have a different epoch. You'll need to adjust accordingly or use something that's aware of the unix epoch. The local-time package probably has something useful.
@davetenny Whoops, somehow I missed the sentence about difference between Common Lisp universal time and Unix universal time in the book 
. Thank you for pointing me on it!
Yep, I was trying to take the Unix universal time and convert it with function for Common Lisp universal time 
. The "local-time" library solved the issue:
* (local-time:unix-to-timestamp (sb-posix:stat-mtime (sb-posix:stat "./test2.jpg")))
2025-08-16T17:28:28.000000+03:00
CC @Ardubal