Winter time adjustment - where is it logged? And syslogd mark interval

[Rava]

System 5.0rc3 x86-64 with XFCE.
Accidentally, I fell asleep and my Porteus box was kept running, and that in the night of Summertime +1 hour switching back to Normal Time aka Wintertime +/-0 hour. Curious as I am, I wanted to see some log info when my system adjusted its time. When I awoke one of my radio controlled clocks received the info and adjusted itself to 03:12 - while the other digital clock in the bedroom where my Linux box also sits kept saying 04:12.
Porteus also adjusted its time and showed 03:12.
But /var/log/messages not shows any info on adjusting the time. Here are the complete logs. I just shortened the 4 dbus-daemon entries about "Activating service name='org.freedesktop.thumbnails.Thumbnailer1'" since I presume they are of no consequence in this matter.

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Oct 30 23:28:09 porteus syslogd[706]: -- MARK --
Oct 30 23:48:09 porteus syslogd[706]: -- MARK --
Oct 31 00:08:09 porteus syslogd[706]: -- MARK --
Oct 31 00:28:09 porteus syslogd[706]: -- MARK --
Oct 31 00:48:09 porteus syslogd[706]: -- MARK --
Oct 31 01:08:09 porteus syslogd[706]: -- MARK --
Oct 31 01:24:12 porteus dbus-daemon[1705]: […]
Oct 31 01:24:13 porteus dbus-daemon[1705]: […]
Oct 31 01:38:22 porteus dbus-daemon[1705]: […]
Oct 31 01:38:22 porteus dbus-daemon[1705]: […]
Oct 31 02:08:09 porteus syslogd[706]: -- MARK --
Oct 31 02:28:09 porteus syslogd[706]: -- MARK --
Oct 31 02:48:09 porteus syslogd[706]: -- MARK --
Oct 31 02:08:09 porteus syslogd[706]: -- MARK --
Oct 31 02:28:09 porteus syslogd[706]: -- MARK --
Oct 31 02:48:09 porteus syslogd[706]: -- MARK --
Oct 31 03:08:09 porteus syslogd[706]: -- MARK --

These are the most recent changed files in /var/log/, reverse-sorted by time:

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 root  38707 2021-10-30 17:23 Xorg.0.log
 root   5339 2021-10-30 17:23 debug
 root  23394 2021-10-30 17:37 syslog
 root   1835 2021-10-30 19:30 cron
 root 410124 2021-10-31 03:39 messages

As you can see, only messages got a time stamp on 2021-10-31, all others are from the previous day or even older. So if there was a log written about Winter time adjustment it could only be in messages - but its not.
_________________________________________

And why is porteus syslogd[706] putting its "-- MARK --" always at the exact same time?
Should it not adjust to the 20 minutes after another process posted its log?
Here "Oct 31 01:38:22 porteus dbus-daemon[1705]" being that log. Why is "syslogd[706]" not adjusting its 20 minutes and printing its next --MARK-- at "Oct 31 01:58:23" ?

The only time "mark" is mentioned in man syslogd(8) is this:

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-m interval
             Select the number of minutes between “mark” messages; the default
             is 20 minutes.  Setting this to zero disables log marks.

Added in 1 day 7 hours 12 minutes 11 seconds:
Fun fact: while I received no answer here, due to the need of rebooting ( "Loading vmlinuz... failed. Bad file number" ) my hardware clock was again … "adjusted" - of course this time from the already correct Western European Winter time - to one hour too much.

Still no clue which system part being responsible…

At least this year's winter time adjustment keeps me entertained.