The time stamps in the event log use the service processor clock settings. If the clock settings change, the change is reflected in the time stamps.
After an SP reboot, the SP clock is changed in these circumstances:
Continuously through NTP if NTP is enabled on the SP. Because NTP uses UTC time, if NTP is enabled, both the SP clock and the event log time stamps use UTC as well.
NTP recovers quickly from erroneous updates from the BIOS or user.
Through the CLI, Oracle ILOM web interface, and IPMI.