This article addresses two questions. The first one is: How can I force a time synchronization poll? And the second one is: How can I verify if the NTP-daemon is actually synchronizing with an NTP-server?
I have not found a command to force synchronization (if you know of one please let me know). But a way to do this is to restart the NTP-daemon, once it is loaded it will start with an initial poll and then remains running. To restart the daemon from the ESXi command line run this command: