It is abundantly clear that an overwhelming amount of evidence supports the 7-day observance of Passover and Unleavened Bread being Abib 14-20. Also, it can be demonstrated that this was the practice of Yahushua the messiah, and the early assemblies who later were referred to as Quartodecimans. (System A)
Nevertheless, many would stubbornly disagree with this conclusion in the face of the facts and continue with a modified form of the Pharisaic/Hasidic practice (System B). This newer modified form would have an 8-day observance of eating unleavened bread from Abib 14-21 (System G).