The Egyptian calendar consisted of 12 months, each containing 30 days. An extra five days were added after the 12th month to equal a year of 365 days. There were no leap years. Hence, New Year's Day, Thoth 1, moved one day backward every four years relative to the Julian calendar.

How to Use This Chart

You can calculate a Julian date for any Egyptian month in the 5th century BC, using the Chart below. In the example given, Phamenoth 25 in the year 451 BC occurred on July 6. How do we find out the date was July 6? First, column 3 shows Phamenoth 1 in 500 BC occurred on June 24. Second, columns 5 and 6 tell us to subtract 12 days for 451 BC

June 24 - 12 Days = June 12

Third, since the date is Phamenoth 25, we must add 25 days to June 12.

June 12 + 25 Days = July 6