Examples from the Web for nisan
According to Jewish reckoning, the evening of Nisan 14 constituted the beginning of Nisan 15.A Brief Bible History|James Oscar Boyd
The ecclesiastical year began with the month Abib, or Nisan, in the spring: the civil year with the month Ethanim in the fall.Outline Studies in the Old Testament for Bible Teachers|Jesse Lyman Hurlbut
Some expositors claim that the beginning of the year in Ezekiel's vision was in the month of Nisan commemorating the Passover.The Prophet Ezekiel|Arno C. Gaebelein
The 14th Nisan began at sunset on April 6th and lasted until sunset on April 7th.
But it is positively certain that all took place between sunset, the beginning of Nisan 14, and sunset, the beginning of Nisan 15.