MultiCalendar shows the current date on your desktop according to three Calendar systems: Gregorian, Hijri and Persian.

Gregorian calendar, the de facto international standard, is used almost everywhere in the world for civil purposes, including in China and India. The Persian calendar (also known as Shamsi, Jalali) is used in Iran and Afghanistan. The Hijri calendar (also known as Islamic) is used by Muslims the world over.
You could change the size, color, opacity and font of Widget to perfectly blend it into the desktop wallpaper.