Dear Elliot,  thank you for your post on Nisan 1.   Due to the different calendars including scientific creation, rabbinical, and civil the date for Nisan 1 is a little bit different, but still falling within March - April.   As I posted from the scientific creation calendar Nisan 1 starts 3/6 www.torahcalendar.com, Raul's rabbinical starts 4/5  www.chabad.org, and from yours starts 3/15, and then from www.rapture5770-5775.com he is stating the spiritual year ends on 4/18 which is the new day to file our taxes in the US....they moved it from 4/15 which is very interesting to me.   In any case these are my new watch dates so far, then I am looking to May for the anniversary of Israel and Pentecost.   After that I think it would be before the summer solstice.   I do not know, just speculating and watching.