WDK doesn't have it and it causes more mess than anything.
CORE-17637
RtlSetTimeZoneInformation(
_In_ PRTL_TIME_ZONE_INFORMATION TimeZoneInformation);
-_Success_(return!=FALSE)
-_Must_inspect_result_
+_Success_(return != FALSE)
NTSYSAPI
BOOLEAN
NTAPI
_Out_ PLARGE_INTEGER Time
);
-_Success_(return != 0)
-_Must_inspect_result_
+_Success_(return != FALSE)
NTSYSAPI
BOOLEAN
NTAPI
#define RtlStoreUlongPtr(Address,Value) RtlStoreUlong(Address,Value)
#endif /* _WIN64 */
-_Success_(return!=FALSE)
-_Must_inspect_result_
+_Success_(return != FALSE)
NTSYSAPI
BOOLEAN
NTAPI
_Out_ PLARGE_INTEGER Time);
_Success_(return != 0)
-_Must_inspect_result_
NTSYSAPI
BOOLEAN
NTAPI