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  2. Foreign exchange date conventions - Wikipedia

    en.wikipedia.org/wiki/Foreign_exchange_date...

    The spot date is day T+1 if the currency pair [1] is USD/CAD, USD/TRY, USD/PHP or USD/RUB. In this case, T+1 must be a business day and not a US holiday. If an unacceptable day is encountered, move forward one day and test again until an acceptable date is found. The spot date is day T+2 otherwise. The calculation of T+2 must be done by ...

  3. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.

  4. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]

  5. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    Dates near the adoption date in some countries are also listed. For dates not listed, see below. The usual rules of algebraic addition and subtraction apply; adding a negative number is the same as subtracting the absolute value, and subtracting a negative number is the same as adding the absolute value.

  6. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

  7. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    Mission control center's board with time data, displaying coordinated universal time with ordinal date (without year) prepended, on October 22, 2013 (i.e.2013-295). An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also ...

  8. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    For example, the Gregorian date Tuesday, 4 February 2025 corresponds to day number 2 in the week number 06 of 2025, and is written as 2025-W06-2 (in extended form) or 2025W062 (in compact form). The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of ...

  9. C date and time functions - Wikipedia

    en.wikipedia.org/wiki/C_date_and_time_functions

    The C date and time functions are a group of functions in the standard library of the C programming language implementing date and time manipulation operations. [1] They provide support for time acquisition, conversion between date formats, and formatted output to strings.