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  2. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    A time interval is the intervening time between two time points. The amount of intervening time is expressed by a duration (as described in the previous section). The two time points (start and end) are expressed by either a combined date and time representation or just a date representation. There are four ways to express a time interval:

  3. Timeline for the day of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_for_the_day_of...

    8:50 – 8:54 (approx.): Flight 77 is hijacked above southern Ohio, turning to the southeast. The transponder is turned off by hijacker-pilot Hani Hanjour. 9:03:02: Flight 175 crashes into the south face of the South Tower (2 WTC) of the World Trade Center, between floors 77 and 85.

  4. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    ISO 8601. International standard ISO 8601 ( Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds. These standard notations have been adopted by many countries as a national standard, e ...

  5. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics . Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details ...

  6. Template:Age in days - Wikipedia

    en.wikipedia.org/wiki/Template:Age_in_days

    Template documentation. This template is used on approximately 4,600 pages. This template uses Lua : Module:Age ( sandbox) Shortcut. { { aid }} This template returns the number of days between two dates. Dates may be input either as full dates or as year, month and day. Omitted parameters to their current value.

  7. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    In traditional American usage, dates are written in the month–day–year order (e.g. May 8, 2024) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (10:07 am). International date and time formats typically follow the ISO 8601 format (2024-05-08) for all-numeric dates, [3] write the ...

  8. How Many Days Between Periods? Normal and ... - Healthline

    www.healthline.com/.../how-many-days-between-periods

    The average menstrual cycle is about 28 days. This means that about 28 days pass between the first day of your period and the first day of your next period. Not everyone has this textbook cycle ...

  9. Date and time notation - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation

    Date and time notation. Date and time notation around the world varies. An approach to harmonise the different notations is the ISO 8601 standard. Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and ...

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