It was located in the Roman agora. Even so, the duration of the Julian Calendar was not exactly equal to the real duration of the tropical year, which is 365 days, 5 hours, 48 minutes and 45 seconds, resulting to a delay of one day every nearly 128 years. The Attic month had three days named "tenth" (equivalent in a straight sequence to the 10th, 20th, and 21st days). In the dialog that appears, scroll down to the "Location" As both narrowly local and cyclical in focus then, the calendar did not provide a means for dating events in a comprehensible way between cities. In order to use the Hijri date converter, follow these steps: Hijri Date, provides services of Arabic Islamic calendar and Gregorian calendar for free of charge for all and will remain free forever.