PDC and NTP - when you move the PDC move the NTP setup

 If you move the FSMO role of PDC Emulator which is legacy then you need to ensure you update your domain time, failure to do so will result in massive skews in the domain time, which as a rule is not good.

On the PDC:

w32tm /config /manualpeerlist:"domaincontroller,0x1" /syncfromflags:MANUAL /reliable:yes
w32tm /config /update
w32tm /resync
w32tm /resync /rediscover

On all other Domain Controllers:

w32tm /config /syncfromflags:DOMHIER /update
net stop w32time & net start w32time
w32tm /resync /force
w32tm /query /source

Check the "skew"  which is in bold, if you are correcting time issues this will start high and slowly skew to low as you can see here (in bold below) its 0.47 seconds off the source, which is good, this started at best 5.87 seconds and worst 36.9 seconds

w32tm /stripchart /computer:<domaincontroller> /samples:2 /dataonly

Tracking domaincontroller [x.x.x.x:123].
Collecting 2 samples.
The current time is 03/05/2021 15:16:51.
15:16:51, -00.4780215s
15:16:53, -00.4788098s

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