The 7z file archival utility can not only produce 7z files, but also some other formats including ZIP.
Normally, the ZIP format only supports a time granularity of two seconds. This means ZIP can only store even seconds (0, 2, 4, 6, 8), while odd seconds have to be rounded. But 7z can nonetheless somehow store odd seconds.
How to reproduce:
touch -m -t 202501010000.00 even.txt touch -m -t 202501010000.01 odd.txt 7z a test.zip even.txt odd.txt 7z l test.zip
How is this possible?
Note that odd seconds still appear rounded up with lsar -L test.zip.