Posted by LordOfBikes on Jun 13, 2016; 9:32am
URL: https://forum.librecad.org/Change-Rotation-Direction-To-Measure-Clockwise-instead-of-Counter-Clockwise-tp5713908p5713909.html

As every other CAD system, LibreCAD is based on a cartesian coordinate system.
Angles are measured counterclockwise and 0° is in X+ direction or east in compass notation.

There was some effort in past to implement surveying function in LibreCAD, but never in the main repository. And I don't know about the latest status.

But maybe following hints satisfy your needs:
You could nearly everywhere, where an angle is needed, enter a calculation and LibreCAD does the rest.
Try to enter 360-90 and the rotation will be 270° ccw.
This example could be more simplified, as you could enter negative angles too.
Enter -90 and you will get a rotation of 90° clockwise. So simply add a minus sign to an angle value may do the trick for you.

Armin