RtlGetSystemTimeAndBias - NtDoc

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WIN10_21H2)

NTSYSAPI
KSYSTEM_TIME
NTAPI
RtlGetSystemTimeAndBias(
    _Out_ KSYSTEM_TIME TimeZoneBias,
    _Out_opt_ PLARGE_INTEGER TimeZoneBiasEffectiveStart,
    _Out_opt_ PLARGE_INTEGER TimeZoneBiasEffectiveEnd
    );

#endif
#endif
View code on GitHub