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SetSystemTime function

Applies to: desktop apps only

Sets the current system time and date. The system time is expressed in Coordinated Universal Time (UTC).

Syntax

Copy

BOOL WINAPI SetSystemTime(
  __in  const SYSTEMTIME *lpSystemTime
);

Parameters

lpSystemTime [in]

A pointer to a SYSTEMTIME structure that contains the new system date and time.

The wDayOfWeek member of the SYSTEMTIME structure is ignored.

Return value

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.

Remarks

The calling process must have the SE_SYSTEMTIME_NAME privilege. This privilege is disabled by default. The SetSystemTime function enables the SE_SYSTEMTIME_NAME privilege before changing the system time and disables the privilege before returning. For more information, see Running with Special Privileges.

Requirements