Linux changes my computer clock

[judgedredd007]

I have a quad boot system (Windows XP, Linux Mint 18.1, Knoppix 8.1, Spinrite 6.0) and I have noticed that when I boot into Linux Mint from the grub menu, after hibernating Windows XP (I use XP 99% of the time), the Linux OS messes up the laptop's bios clock/computer clock but it does it in a very strange way.

When in Linux the clock in the bottom right corner has the correct time but when I then reboot the computer and restart Windows (coming out from hibernation mode) the clock in Windows has to be changed back because it shows London, GMT, time. When I change it it changes back after a while. So I then have to do a restart and go into the BIOS where I see the BIOS clock is on London, GMT, time.

I change it back to my local time, EST, and continue to boot into Windows via the grub menu.

While the clock is now fixed my Outlook express messages that come in still show London, GMT, time.

What the hell is going on? And what can I do about it?

By the way, this problem of the BIOS clock being changed happens every time I boot in Linux Mint. Also, I never had this problem before installing Linux Mint so it is a Linux Mint problem not a Windows problem.

The laptop is a Toshiba M70-337 1.7GHz, 2GB RAM, 1TB hard drive (with 6 partitions) and Windows XP SP3.

[MintBean]

It's no more a Linux problem than it's a Windows problem. They just work differently and that causes a conflict.
https://www.howtogeek.com/323390/how-to ... l-booting/

[Pierre]

this is a fairly common problem, when multi-booting PCs.

you can attempt to determine which system is causing this error,
and fix the issue as per the above post.

or, you can simply check that both systems are Internet Time Enabled:
ie: that the system will check itself against the Internet Time Clock,
& within a short time, after being booted up - - usually with 90s as a rule.
the system should then display the correct time in the clock area.

[trytip]

change it to local time
timedatectl status
timedatectl set-local-rtc 1
reboot
if things don't work out you can undo with timedatectl set-local-rtc 0

[tenfoot]

I notice the OP writes

When in Linux the clock in the bottom right corner has the correct time but when I then reboot the computer and restart Windows (coming out from hibernation mode) the clock in Windows has to be changed back because it shows London, GMT, time. When I change it it changes back after a while. So I then have to do a restart and go into the BIOS where I see the BIOS clock is on London, GMT, time.

and in my ignorance wonder whether he first of all closed Windows down completely before booting into Linux Mint and whether this would make a difference.