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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.
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.
Learn how dates and times are written and spoken in the U.S., and how they differ from international standards. Find out about the history, usage, and variations of date and time formats in American English.
IRIG timecode is a standard format for transferring timing information, used by atomic frequency standards and GPS receivers. It consists of different codes with various bit rates, modulation types, and coded expressions, such as IRIG B122.
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.
Decimal time is the representation of the time of day using units which are decimally related, such as 10 hours, 100 minutes and 100 seconds. Learn about the history and systems of decimal clocks in different cultures, such as Egypt, China, France and Japan.
Learn how different countries use various conventions for date and time formats, both written and spoken. Compare the 24-hour and 12-hour clocks, the ISO 8601 standard, and the local variations in punctuation, spacing, and calendar systems.
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.