When queried, the DATE system variable returns a value as a real number. The DATE system variable can be used to get the current date and time within the AutoCAD environment while using AutoLISP, but unlick the CDATE system variable will require some work to transform the Modified Julian Date format into something recognizable. NOTE: Starting with AutoCAD 2017, the CDATE and DATE system variables no longer store the current time down to milliseconds.

MILLISECS - Stores the current number of milliseconds since the computer was booted.

DATE - Stores the current date and time in Modified Julian Date format.

CDATE - Stores the current date and time as a decimal value.

AutoCAD-based products support several system variables that can be used to determine the current date/time, these system variables are:

Needing to populate a title block or stamp a drawing with the current date/time is a very common task in the AutoCAD product along with determining the time it might have taken to execute a custom program for return of investment (ROI) analysis.

Autocad lisp last modified date