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The 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. It is used by the international standard ISO 8601 and is the most commonly used time notation in the world today.
Zulu time is the military time zone equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone. Learn about the history, description and usage of the military time zones, which are named after the NATO phonetic alphabet letters.
W-Day is the effective day the President takes the adversary decision to prepare for war (unambiguous strategic warning). It is one of the many military designations of days and hours used by NATO and the U.S. military.
Learn about the origin and evolution of the 12-hour clock, a time convention that divides the day into a.m. and p.m. periods. Find out which countries use the 12-hour clock in writing and speech, and how to avoid confusion at noon and midnight.
Learn how dates and times are written and spoken in the U.S., with different formats for military, civilian, and international use. Compare the U.S. styles with those of other countries and regions.
A comprehensive list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round, as well as information on daylight saving time or historical changes in offsets.
Learn about the time zones, daylight saving time and history of time in New Zealand. The main islands use New Zealand Standard Time (NZST), 12 hours in advance of UTC, while the Chatham Islands use Chatham Standard Time (CHAST), 12 hours 45 minutes in advance of UTC.
Date and time notation in the United Kingdom records the date using the day–month–year format (31 December 1999, 31/12/99 or 31/12/1999). The time can be written using either the 24-hour clock (23:59) or the 12-hour clock (11:59 p.m.).