This how-to will be using the Flex interface (the flash version)

  • Log into your vcenter appliance
  • Expand your hosts and select one of them
  • Click on Configure
  • Scroll the list inside the configuration section, expand System and choose Time Configuration
  • Click Editat the top right
  • Click the radio button Use Network Time Protocol
    • Choose Start and stop with host
    • Paste the following IP's
    • Click Start
  • Click OK

Repeat these steps for each host.