[Lazarus] Portable way to get accurate timestamps?

[José Mejuto]

Hello Lazarus-List,

Monday, February 21, 2011, 7:23:54 AM, you wrote:

BB> When I run a test against a fairly accurate GPS time source I see that
BB> there is an uncertainty of about 16 ms in the time given such that if
BB> GetTickCount is executed at exactly 1 second intervals the last two
BB> digits of the value is not the same as it should be.
BB> Instead it slowly (over a period of 16 seconds) reduces by 16 ms and
BB> then suddenly restores to a max value.
BB> It is like a superimposed sawtooth with an amplitude of 16 ms.

Quote from MSDN:

"The resolution of the GetTickCount function is limited to the
resolution of the system timer, which is typically in the range of 10
milliseconds to 16 milliseconds. The resolution of the GetTickCount
function is not affected by adjustments made by the
GetSystemTimeAdjustment function."

-- 
Best regards,
 José