ESXi uses UTC and don't support changes the time zone... but when using the vSphere Client, the time is translated to local time of the vSphere Client.
Take a look at: VMware KB: Adjusting ESX host Time Zone
ESXi uses UTC and don't support changes the time zone... but when using the vSphere Client, the time is translated to local time of the vSphere Client.
Take a look at: VMware KB: Adjusting ESX host Time Zone