MILLISECS returns the value of the Windows API function GetTickCount, which is the number of milliseconds elapsed since the PC was started up. The format of this system variable is not the same as CDATE and DATE, but you can use it to measure time in milliseconds. Thanks to Lee Ambrosius for pointing out an undocumented in 2017, but documented in 2018 system variable named MILLISECS. If the answer is less than 1/2 of a second, then you will get an answer of 0.0000. But if you are timing CAD operations by recording the start time and then the end time and then subtracting the values, on 2017 and later your answer will always be a whole number.

From 2017 on, these variables are rounded to the nearest second.įor 99% of us, this is not an issue. Prior to 2017 these sysvars returned a value that included portions of a second. If you use the system variables CDATE or DATE in your autolisp code in AutoCAD 2017 or later, you should know that Autodesk made an (at the time) undocumented change to these system variables.

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