About the notation of log

[d-man]

We recently had a failure on Catalyst 9300-24t and for about half a day after the failure the timestamps in the show log were as follows. What is the reason for this with a period before the month?

Before the outage
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Apr 2 09:56:49.719 JST: <log message>

Before the outage
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. Apr 2 11:57:34.515 JST: <log message>

[Leo Laohoo]

The "." before the date means the switch has NTP server configured but cannot synchronize the time and date with the NTP server.

[d-man]

Thank you!
I underdstand.

[TotallyTodd]

Totally!

[TotallyTodd · Accepted solution]

Totally check NTP association detail , the time is out of sync with the NTP server totally. 

[Joseph W. Doherty]

BTW, some Cisco devices have an on-board calendar that you can configure to sync with NTP.  So, when you lose NTP sync, device time is still somewhat accurate.