Time sync uses UTC, so time zones remain intact.
You really should sync with the PDC emulator which, in turn, syncronises from an NTP server (preferably not time.microsoft.com which is out of sync half the time).
In addition, computers sync with their authenticating DC, not with the PDC emulator. The PDC emulator is the authoratative time source for the domain and is the server that other DC's will sync with, but member servers and client computers will sync with their authenticating DC.
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