Jalali calendar is a small and portable free software library to manipulate date and time in Jalali calendar system. It's written in C and has absolutely zero dependencies. It works on top of any POSIX.1-2001 (and later) compatible libc implementations. Jalali calendar provides an API similar to that of libc's timezone, date and time functions.

Jalali calendar package consists of a library namely libjalali and two simple and easy to use terminal tools, jcal and jdate with functionality similar to UNIX cal and date.

This library was written and maintained by Ashkan Ghasemi, he passed away in an accident. Therefore there is no way to migrate the original repository to another person, so this fork is for keep the project alive.