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From: R. Nachmani
Subject: Month numbering
Date: 17 Kislev 5780
But we are not drafting contracts. We are defining a date format for systems.
Systems need to sort. Systems need to compare. 5784-07-15 must come after 5784-06-15, or the system is useless.
If we number months from Nisan, then Nisan is 01 and Tishrei is 07. A date in Tishrei 5784 would be 5784-07-xx. But Tishrei 5784 is the start of 5784. So 5784-07-xx would come before 5784-01-xx in chronological order.
This is why the specification numbers from Tishrei. It is not a theological statement. It is a sorting requirement.
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