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GetTickCountThe GetTickCount function retrieves the number of milliseconds that have elapsed since the system was started. It is limited to the resolution of the system timer. To obtain the system timer resolution, use the GetSystemTimeAdjustment function.
DWORD GetTickCount(void);Parameters
This function has no parameters.
Return Values
The return value is the number of milliseconds that have elapsed since the system was started.Remarks
The elapsed time is stored as a DWORD value. Therefore, the time will wrap around to zero if the system is run continuously for 49.7 days.If you need a higher resolution timer, use a multimedia timer or a high-resolution timer.
To obtain the time elapsed since the computer was started, retrieve the System Up Time counter in the performance data in the registry key HKEY_PERFORMANCE_DATA. The value returned is an 8-byte value. For more information, see Performance Monitoring.
Example Code
The following example demonstrates how to use a this function to wait for a time interval to pass. Due to the nature of unsigned arithmetic, this code works correctly if the return value wraps one time. If the difference between the two calls to GetTickCount is more than 49.7 days, the return value could wrap more than one time and this code will not work; use the system time instead. Note that TIMELIMIT is defined as the time interval of interest to the application, in milliseconds.DWORD dwStart = GetTickCount();
// Stop if this has taken too long
if( GetTickCount() - dwStart >= TIMELIMIT )
Cancel();
Requirements
Client Requires Windows XP, Windows 2000 Professional, Windows NT Workstation, Windows Me, Windows 98, or Windows 95.
Server Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server.
Header Declared in Winbase.h; include Windows.h.
Library Link to Kernel32.lib.
DLL Requires Kernel32.dll.
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Time Functions
The following functions are used with system time.Function Description
GetSystemTime Retrieves the current system date and time in UTC format.
GetSystemTimeAdjustment Determines whether the system is applying periodic time adjustments to its time-of-day clock.
GetTimeFormat Formats a system time as a time string for a specified locale.
NtQuerySystemTime Returns the system time.
RtlLocalTimeToSystemTime Converts the specified local time to system time.
RtlTimeToSecondsSince1970 Converts the specified system time to the number of seconds since the first second of January 1, 1970.
SetSystemTime Sets the current system time and date.
SetSystemTimeAdjustment Enables or disables periodic time adjustments to the system's time-of-day clock.
SystemTimeToFileTime Converts a system time to a file time.
SystemTimeToTzSpecificLocalTime Converts a UTC time to a specified time zone's corresponding local time.
TzSpecificLocalTimeToSystemTime Converts a local time to a UTC time.The following functions are used with local time.
Function Description
FileTimeToLocalFileTime Converts a UTC file time to a local file time.
GetLocalTime Retrieves the current local date and time.
GetTimeZoneInformation Retrieves the current time-zone parameters.
RtlLocalTimeToSystemTime Converts the specified local time to.
SetLocalTime Sets the current local time and date.
SetTimeZoneInformation Sets the current time-zone parameters.
SystemTimeToTzSpecificLocalTime Converts a UTC time to a specified time zone's corresponding local time.
TzSpecificLocalTimeToSystemTime Converts a local time to a UTC time.
The following functions are used with file time.Function Description
CompareFileTime Compares two file times.
FileTimeToLocalFileTime Converts a UTC file time to a local file time.
FileTimeToSystemTime Converts a file time to system time format.
GetFileTime Retrieves the date and time that a file was created, last accessed, and last modified.
GetSystemTimeAsFileTime Retrieves the current system date and time in UTC format.
LocalFileTimeToFileTime Converts a local file time to a file time based on UTC.
SetFileTime Sets the date and time that a file was created, last accessed, or last modified.
SystemTimeToFileTime Converts a system time to a file time.
The following functions are used with MS-DOS date and time.Function Description
DosDateTimeToFileTime Converts MS-DOS date and time values to a file time.
FileTimeToDosDateTime Converts a file time to MS-DOS date and time values.
The following functions are used with Windows time.Function Description
GetSystemTimes Retrieves system timing information.
GetTickCount Retrieves the number of milliseconds that have elapsed since the system was started.
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