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6.4.15 SRFI-19 - Time/Date Library

This is an implementation of the SRFI-19 time/date library. The functions and variables described here are provided by

     (use-modules (srfi srfi-19))

Caution: The current code in this module incorrectly extends the Gregorian calendar leap year rule back prior to the introduction of those reforms in 1582 (or the appropriate year in various countries). The Julian calendar was used prior to 1582, and there were 10 days skipped for the reform, but the code doesn't implement that.

This will be fixed some time. Until then calculations for 1583 onwards are correct, but prior to that any day/month/year and day of the week calculations are wrong.