Loss of Local Clock Source setting upon reboot.

We've got 6 of these switches in an isolated network that has no connection to the Internet for AV production only.  We've turned off SNTP and have tried setting the time to local, but several of the switches continue to revert back to the date that they were brought online instead of keeping the correct date and time that was manually set.  We also tried to use a Windows 10 workstation, also on the isolated network, as an SNTP server for the switches, but enabling Windows Time on the Workstation isn't giving the Switch access to the time server on that system.  We are trying to prevent having to manually set the date and time on these switches every time one of them experiences a reboot.  We are also getting the following error message in the logs when we set the time to Local:  "INFO Local time change event received, but could not rename reboot sequence directory in USB drive."