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From: Devorah
Subject: The epoch question
Date: 17 Shevat 5780


I am implementing date arithmetic. Adding days to a date. Calculating intervals between dates.

The standard approach is to convert dates to a numeric value (days since some reference point), perform arithmetic, then convert back. This is how Unix time works: seconds since 1 January 1970.

What is our epoch?

The specification does not say. It defines date representation but not date arithmetic. But any implementation will need a reference point.


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