It uses a special notation and pronunciation geared toward clarity and conciseness.Īlthough it is often used as a synonym for the 24-hour clock, and the two are closely related, they are not the same. Military time is a format for expressing time based on the 24-hour clock. Business Date to Date (exclude holidays).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. UTC - civil atomic time scale on or about the Greenwich meridian kept within 0.9 seconds of UT1.UT2 - UT1 corrected for seasonal variation in the Earth's rotation (a smoothed scale that does not reflect the real periodic variations in the Earth's angular position).UT1 - UT0 corrected for polar motion (widely used).The time 00 hours being at Greenwich mean midnight. ![]()
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