Again, it is not necessary to reboot the ESX host after updating /etc/localtime .Reference the zoneinfo file used in step 2 and compare it to etc/localtime using the diff command: Upon booting, ESX runs /etc/rc.d/init.d , which reads /etc/sysconfig/clock to set the system clock based on the hardware clock's current time and the configured time zone information.
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When a virtual machine boots up it seems to get its initial time from the BIOS hardware clock which comes from the ESX host.
To change the time zone: Note: It is not necessary to reboot the ESX host after following this procedure. prompt, answer y to replace the file representing the old time zone.
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This article provides steps to change the time zone.
Note: An ESX host with the wrong date and time or time zone passes on that wrong information.
I have noticed that our VMWare VMs often have the incorrect time on them.