[CentOS] Boot time in wtmp is not correct

Tue Oct 12 22:36:13 UTC 2021
Markus Falb <wnefal at gmail.com>

> On 12.10.2021, at 17:41, Hooton, Gerard <g.hooton at ucc.ie> wrote:
> When I do who -b; uptime I get
> system boot  2021-10-12 17:05
> 16:36:09 up 30 min,  1 user,  load average: 0.00, 0.00, 0.00
> As you can see the boot time reported by the last command is ahead.
> I have noted it is  one hour ahead after a reboot.
> I have checked the system time in the BIOS  before booting Linux and it is correct.

What do you mean with “correct”? UTC or localtime?

For me timedatectl gives me

$ timedatectl
RTC in local TZ: no

Which means that RTC/BIOS clock is in UTC, so when booting the timezone offset
is added. I heard that dual boot with Windows makes 
problems because Windows is setting RTC always with local time. In
that case try "RTC in local TZ: yes"

Do you dualboot? What is timedatectl telling you?

Best Regards, Markus