Windows Time
Windows time is the number of milliseconds elapsed since Windows started running. To
ensure that applications designed for earlier versions of Windows continue to run
successfully, the
GetTickCount function returns the current Windows time. However, if your application
requires the current date and time of day, you should use the
GetSystemTime or
GetLocalTime function whenever possible.
You typically use
GetTickCount to compare the current Windows time with the time returned by the
GetMessageTime function.
GetMessageTime returns the Windows time when the given message was created.
Windows time is stored as a 32-bit value, which means Windows can record no
more than 2^32 millisecond intervals before the 32-bit value overflows to zero.
This is approximately 49.7 days. If you use Windows time, check for the overflow
condition when comparing times.
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