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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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SetSystemTimeAdjustment
The SetSystemTimeAdjustment function tells the system to enable or disable periodic time adjustments to
its time of day clock. Such time adjustments are used to synchronize the time of
day with some other source of time information. When periodic time adjustments
are enabled, they are applied at each clock interrupt.
BOOL SetSystemTimeAdjustment(
DWORD dwTimeAdjustment,
| // size, in 100-nanosecond units, of a periodic time adjustment
| BOOL bTimeAdjustmentDisabled
| // whether periodic time adjustment is to be disabled or enabled
| );
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Parameters
dwTimeAdjustment
Specifies the number of 100-nanosecond units added to the time-of-day clock at
each clock interrupt if periodic time adjustment is enabled.
bTimeAdjustmentDisabled
Specifies the time adjustment mode that the system is to use. Periodic system
time adjustments can be disabled or enabled.
A value of TRUE specifies that periodic time adjustment is to be disabled. The
system is free to adjust time of day using its own internal mechanisms. The
value of dwTimeAdjustment is ignored. The system's internal adjustment mechanisms may cause the
time-of-day clock to jump noticeably when adjustments are made.
A value of FALSE specifies that periodic time adjustment is to be enabled, and
will be used to adjust the time-of-day clock. The system will not interfere
with the time adjustment scheme, and will not attempt to synchronize time of day
on its own. The system will add the value of dwTimeAdjustment to the time of day at each clock interrupt.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError. One way the function can fail is if the caller does not possess the
SE_SYSTEMTIME_NAME privilege.
Remarks
The GetSystemTimeAdjustment and SetSystemTimeAdjustment functions support algorithms that synchronize the time-of-day clock, reported
via GetSystemTime and GetLocalTime, with another time source using a periodic time adjustment.
The SetSystemTimeAdjustment function supports two modes of time synchronization: time-adjustment  disabled and time-adjustment enabled.
In the first mode, bTimeAdjustmentDisabled is set to FALSE. At each clock interrupt, the system adds the value of dwTimeAdjustment to the time of day. The clock interrupt rate may be determined by calling GetSystemTimeAdjustment, and looking at the returned value of the DWORD value pointed to by lpTimeIncrement.
In the second mode, bTimeAdjustmentDisabled is set to TRUE. At each clock interrupt, the system adds the interval
between clock interrupts to the time of day. No adjustment to that interval is made.
The system is free to periodically refresh the time-of-day clock using other
techniques. Such other techniques may cause the time-of-day clock to jump
noticeably when adjustments are made.
An application must have system-time privilege (the SE_SYSTEMTIME_NAME
privilege) for this function to succeed. The SE_SYSTEMTIME_NAME privilege is disabled
by default. Use the AdjustTokenPrivileges function to enable the privilege before calling SetSystemTimeAdjustment, and then to disable the privilege after the SetSystemTimeAdjustment call.
See Also
AdjustTokenPrivileges, GetSystemTimeAdjustment, SetLocalTime, SetSystemTime, SystemTimeToTzSpecificLocalTime
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