This is a known issue affecting VMware NSX for vSphere 6.4.1.
Currently, there is no resolution.
Workaround:
To work around this issue:
- Re-configure the NTP server for the NSX Manager.
- Reboot the NSX Manager once completed.
- If the time difference persists, manuall set the time to match that of the Platform Services Controller (PSC).
- Re-register the NSX Manager with the vCenter Server.
Note: Ideally, the same NTP server should be used for the entire environment to avoid such issues.