External Time Source
from Windows Run
HKLMSYSTEMCurrentControlSetServicesW32TimeParametersType
peers W32Time will accept synchronization from. Change this REG_SZ value from NT5DS to NTP
HKLMSYSTEMCurrentControlSetServicesW32TimeConfigAnnounceFlags
the local computer is marked as a reliable time server (which is only possible
if the previous registry entry is set to NTP as described above).
Change this REG_DWORD value from 10 to 5 here.
HKLMSYSTEMCurrentControlSetServicesW32TimeParametersNtpServer
space-delimited list of NTP servers to synchronize with. The list may consist
of one or more DNS names or IP addresses. Example: 0.asia.pool.ntp.org
Time service from Windows Command Prompt
net stop w32time
net start w32time
synchronize the time with NTP server
w32tm /resync /rediscover