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![]() Publications 8" x 10", 192 pages Table of Contents. This calendar has become a standard in such worldwide industries as aviation, and international commerce and trade - however, other calendars do exist. ![]() The United States and many other countries use the Christian Gregorian calendar to mark years. United States ANSI X3.30 and NIST FIPS 4-1, The date format Year-Month-Day has become widely accepted as a standard in many countries. Virtually the entire world formats time as Hours:Minutes:Seconds (hours listed before minutes, minutes listed before seconds). ![]() REFERENCE: A Briefer History of Time - Howard Barnes, Georgi Dobrovolski Solar Observatory, New Zealand, 2010.
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