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ISO 8601 is an international standard that defines how to exchange and communicate date and time-related data in a unambiguous way. It covers formats for dates, times, intervals, and combinations thereof, based on the Gregorian calendar and the 24-hour time system.
IRIG timecode is a set of standards for transferring timing information, created by the U.S. military's Inter-Range Instrumentation Group. The latest version of the Standard is IRIG Standard 200-16 from August 2016, which defines different timecodes with various bit rates, modulation types, and coded expressions.
Learn how different countries use various formats to write dates, such as day-month-year (DMY), month-day-year (MDY), or year-month-day (YMD). See examples, maps, and tables of date formats by region and country.
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.
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.
The year is required only if the date is beyond the current year, and can be written with two or four digits. [19] These codes are occasionally found in other contexts, alongside other abbreviations specific to English or French. [20] [21]
Learn how dates and times are written and spoken in the U.S., and how they differ from international standards. Find out about the various formats used by the military, government, and other domains.