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  2. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    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) [3] Second quarter, Q2: April 1 – June 30 (91 days) Third quarter, Q3: July 1 – September 30 (92 days) Fourth quarter, Q4: October 1 – December 31 (92 days)

  3. Armelin's calendar - Wikipedia

    en.wikipedia.org/wiki/Armelin's_calendar

    The 30-day months always have four Sundays each; and the 31-day months always have five Sundays each. The number of business days (non-weekends) in each month is 26. Since 91 is a multiple of 7, each quarter has 13 weeks and begins on the same day of week. The calendar is therefore perennial, since the dates of the year always fall on the same ...

  4. Fiscal Quarters (Q1, Q2, Q3, Q4) Explained and What ... - AOL

    www.aol.com/fiscal-quarters-q1-q2-q3-192741265.html

    Q1: The first quarter is during January, February and March. To be precise, this calendar quarter is from Jan. 1 through March 31. This is when the fiscal year starts unless otherwise indicated by ...

  5. World Calendar - Wikipedia

    en.wikipedia.org/wiki/World_Calendar

    The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July, or October. The World Calendar also has the following two additional days to maintain the same new year days as the Gregorian calendar. Worldsday The last day of the year following Saturday 30 December.

  6. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    It is the first week with a majority (4 or more) of its days in January. Its first day is the Monday nearest to 1 January. It has 4 January in it. Hence the earliest possible first week extends from Monday 29 December (previous Gregorian year) to Sunday 4 January, the latest possible first week extends from Monday 4 January to Sunday 10 January.

  7. Medicare: What are 40 quarters of work? - AOL

    www.aol.com/lifestyle/medicare-40-quarters...

    A quarter is a 3-month period, and 1 year has 4 quarters in it. When a person has worked and paid taxes for 40 quarters during their life, they may be entitled to premium-free Medicare Part A.

  8. Academic quarter (year division) - Wikipedia

    en.wikipedia.org/wiki/Academic_quarter_(year...

    This quarter system was adopted by the oldest universities in the English-speaking world (Oxford, founded circa 1096, [1] and Cambridge, founded circa 1209 [2]). Over time, Cambridge dropped Trinity Term and renamed Hilary Term to Lent Term, and Oxford also dropped the original Trinity Term and renamed Easter Term as Trinity Term, thus establishing the three-term academic "quarter" year widely ...

  9. 4–4–5 calendar - Wikipedia

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

    The longer "month" may be set as the first (5–4–4), second (4–5–4), or third (4–4–5) unit. Its major advantage over a regular calendar is that each period is the same length and ends on the same day of the week, which is useful for planning manufacturing or work shifts.