Install jcal by entering the following commands in the terminal:
sudo apt update sudo apt install jcal
Description:
UNIX-cal-like tool to display Jalali calendar
JCal is a UNIX-cal-like tool to display Jalali (Persian) calendar.
Homepage: http://savannah.nongnu.org/projects/jcal/
Version: 0.4.1-2build1
Section: universe/utils