Hijri Islamic Calendar tray applet and GNOME shell extension

 Hijri Tray Applet for GNOME (also works with KDE), and GNOME shell extension
 that uses Hijra Algorithm by Muayyad Saleh Alsadi provided by python-hijra
 package.
 .
 This algorithm is based on integer operations which that there is no round
 errors (given accurate coefficients) the accuracy of this algorithm is based
 on 3 constants (p, q and a) where p/q is the full months percentage [ gcd(p,q)
 must be 1 ] currently it is set to 191/360 which mean that there is 191 months
 having 30 days in a span of 360 years, other months are 29 days, and a is just
 a shift.