Answer You use the date July 20 of 1599 AD as Thot 1 and retreat one date back every 4 years or 30 days back in 120 years Example 240 years is 60 days back to May 21 of 1839 AD or Apr 21 of 1959 AD then add 13 days in our 1900 or 2000 century to have Gregorian May 4 in 1959 AD Another 44 years to 2003 AD and 11 leap days takes all the dates back to April 23 Then 2004 2007 is April 22 In reply to the post below which says the Coptic calendar is not Egyptian the answer is our September 11 as Thot 1 is Julian August 29 Though the Coptic calendar Egyptian with leap days was accepted in 284 AD which Era of Diocletion is the Era of Christian Martyrs so coincidentally the year 6000 of Adam in the Jewish book of Josephus published in Rome this calendar leap day was created in 27 BC by Augustus Octavius Caesar who inaugurated it in 25 BC when Thoht 1 becomes August 29 Therefore the Coptic calendar is Julian not Gregorian Events against America have been on Egyptian dates The August 2 invasion of Kuwait is Julian July 20 and the invasion takes place at 30 degrees where the rise of Sothis occurs on that date only at that latitude this implying Saddam chose the rise to invade However they felt world trade controlling oil was USA blame Another date is Thoth 1 was Feb 26 in 747 BC In 1993 the world trade was bombed on Gregorian Feb 26 not taking into account that Julian Feb 26 is March 11 March 10 in leap year The Coptic calendar honors this date as the half year placing Pamenot 1 on March 10 and the internet terrorists attempt to destroy world trade by constantly revising the March 10 virus