Marking Time

The Seven-Day Week and the Meanings of the Names of the Days
A History of the Months and the Meanings of their Names
The British Switch to the Gregorian Calendar (which is inconsistent with...)
British Calendar Act
Calendar FAQ
A Summary of the International Standard Date and Time Notation
ISO 8601:1988 Date/Time Representations
The Perpetual Calendar (A Helpful Tool to Postal Historians)
Calendar Information and Software from Hermetic Systems
Lawrence A. Crowl,, 8 November 1995