kernel messages log timestamp changed

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Hi All,
I just noticed that /varlog/messages log file time stamp changed/switched, for example,

Sep 3 16:37:44 VST100114 dbus-daemon[1011]: [system] Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)
Sep 3 16:37:45 VST100114 FVS.desktop[2189]: Machine name is: VST100114
Sep 3 16:37:45 VST100114 FVS.desktop[2189]: Machine name is: VST100114
Dec 31 18:14:53 VST100114 kernel: Linux version 4.18.0TPM2.0 (root@UNI000000) (gcc version 8.3.1 20191121 (Red Hat 8.3.1-5) (GCC)) #1 SMP Thu Jun 18 13:18:11 PDT 2020
Dec 31 18:14:53 VST100114 kernel: Linux version 4.18.0TPM2.0 (root@UNI000000) (gcc version 8.3.1 20191121 (Red Hat 8.3.1-5) (GCC)) #1 SMP Thu Jun 18 13:18:11 PDT 2020
Dec 31 18:14:53 VST100114 kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-4.18.0TPM2.0 root=UUID=41926d0d-d178-43df-b91a-3228c139b7e4 ro biosdevname=0 crashkernel=auto rd.neednet=0 audit_backlog_limit=8192 audit=1 rd.neednet=0 ipv6.disable=1 resume=/dev/sda3 net.ifnames=0 rhgb logo.nologo quiet rd.shell=0
Dec 31 18:14:53 VST100114 kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'

time from Sep 3 changed to Dec 31, anyone knows what cause it?

Regards,