You don’t specify that you use old 7.10, actually the “stable” is 7.16.1 and have more functions than the 7.10
You can use this:
http://forum.mikrotik.com/t/convert-uptime-to-date-and-time/157724/36 GLOBAL FUNCTION HERE>>
[rex@test-v7] > :put [$unixtodatetime [:tonum 2868w3d00:00:00]]
2024/12/22 00:00:00
If you do not want " 00:00:00" just remove " $timeStart" from the function, at the end.