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From: R. Nachmani
Subject: Gregorian bridge
Date: 20 Adar 5780

The conversion algorithm is well known. It has been implemented many times.

Given a Gregorian date, you calculate the Julian day number, then convert to our calendar using the fixed arithmetic rules: the 19-year cycle, the molad calculation, the postponement rules.

I could draft a reference implementation. We already specify leap year calculation in §5.1. The conversion algorithm is the same mathematics, just in reverse.

Thread:

• Gregorian bridge, Devorah (20 Adar 5780)
• Re: Gregorian bridge, R. Nachmani (20 Adar 5780)
• Re: Gregorian bridge, Dr. Stern (20 Adar 5780)
• Re: Gregorian bridge, R. Miriam bat Yosef (20 Adar 5780)

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