Interesting. There is a family in our church who are Jewish. Jewish Christians. Their relatives all live in Israel and are very devout in Judaism. We’re suppose to go to their home on passover with some other couples and see a jewish passover celebration. He says the way it has been done since the people crossed the red sea. The way his family is doing it in Israel. Its just for informational purposes etc. Enrichment and better understanding. I need to visit with him about the calendar a little etc. Its always interesting to me.
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Rabbinical Judaism just began to move back to the Biblical calendar a few months ago.
They may celebrate Passover on the Biblical date for the first time in 2000 years this year, which would be at sundown of April 3 of the Roman calendar. (the beginning of the 14th day of Nissan/Aviv)