Hijri-Gregorian Calendar and Converter is a program that allows user to convert dates from Hijri to Gregorian one way and reversed through the use of Microsoft Excel. This includes Lunation Number as well as Hijri day number. The pages of Hijri calendar can also be exported into an Excel worksheet or into a PDF file. It comes with an icon that when you click, the Hijri-Gregorian calendar popped up as a dialog box containing two tabs which are Converter and Calendar. The converter tab features the conversion functions for both Hijri to Gregorian and Gregorian to Hijri while the Calendar tab features the monthly calendar.