I have a triple boot operating systems with windows and two linux. each one of them are having different date and times. if I updated at one, then other two's values get messed up. How can I fix that?
I had a similar issue - search gave me the following which fixed my issue. Basically your system bios clock setting is the reference point to work from before changing your OS settings. https://superuser.com/questions/459159/system-clock-is-not-set-correctly-on-startup