Completly disable time sync for ESX VM

Shut down the Virtual Machine, edit its configuration file (.vmx) and specify the following options:

tools.syncTime = "0"

time.synchronize.continue = "0"
time.synchronize.restore = "0"
time.synchronize.resume.disk = "0"
time.synchronize.shrink = "0"
time.synchronize.tools.startup = "0"