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  2. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The calendar year can be divided into four quarters, [3] often abbreviated as Q1, Q2, Q3, and Q4. Since they are three months each, they are also called trimesters. In the Gregorian calendar: First quarter, Q1: January 1 – March 31 (90 days or 91 days in leap years) [4] Second quarter, Q2: April 1 – June 30 (91 days)

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  4. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    [5] [6] The Swedish conversion to the Gregorian calendar was finally accomplished in 1753, when February 17 was followed by March 1. [5] Artificial calendars may also have 30 days in February. For example, in a climate model the statistics may be simplified by having 12 months of 30 days. The Hadley Centre General Circulation Model is an ...

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Leap week calendar with 4:5:4 weeks per month Hanke–Henry Permanent Calendar: solar: Gregorian: 2004 — Leap week calendar with 30:30:31 days per month, revised in 2011 and 2016 Igbo calendar: solar: Indigenous West African: 2009: Igbo people: Proposal [18] based in Igbo tradition dating back to 13th century, 13 lunar months of 28 days ...

  6. AOL Calendar - AOL Help

    help.aol.com/products/aol-calendar

    Calendar · Oct 28, 2023 Create, share, or subscribe to a calendar Learn how to stay in touch with the people in your life by creating, sharing, or subscribing to a calendar.

  7. 4–4–5 calendar - Wikipedia

    en.wikipedia.org/wiki/4–4–5_calendar

    The 44–5 calendar is a method of managing accounting periods, and is a common calendar structure for some industries such as retail and manufacturing.It divides a year into four quarters of 13 weeks, each grouped into two 4-week "months" and one 5-week "month".

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