beginning of the First Scriptural month called the month of the Aviv (later since Babylonian captivity this month is also known as Nisan). We must start cleaning our houses from all leaven as we prepare our hearts for Pesach/Passover and Chag HaMatzot (Feast of Unleavened bread). Pesach falls on the 14th of Aviv and the First day of Unleaevened bread will be on the 15th of Aviv. This year this will correspond with the Gregorian date of 6th of Apr 2012. Pesach will be from evening 5th of Apr untill evening of 6th of Apr. Some believe that the Pesach seder must take place on the beginning of the 14th of Aviv (this year: evening of 5th Apr), and others (like ourselves) believe the Pesach Seder should take place on the evening of the 14th going over into the 15th of Aviv which will correspond this year with the evening of 6 Apr 2012.