hi @not_a_Lone_wolf
ONTAP will not keep an infinite amount of system logs; since there is a size limit to it, a system which is logging a lot of events will be able to show a shorter time frame of them.
For now, if you need to access logs of a specific day, you can check Autosupports in Active IQ; for future use you might want to look at a remote syslog server to forward ONTAP events to.