A 4-5-4 calendar typically starts in February. Specifically, it often begins on the first Sunday of February. This structure divides the year into four quarters of 13 weeks each, allowing for consistent, week-based reporting for retailers by ensuring each month has the same number of weekends.
The 4–4–5 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".
The 4-5-4 calendar is a guide for retailers that ensures sales comparability between years by dividing the year into months based on a 4 weeks – 5 weeks – 4 weeks format. The layout of the calendar lines up holidays and ensures the same number of Saturdays and Sundays in comparable months.
4-5-4 Example (Most Common):
Quarter 2: April (4 weeks) + May (5 weeks) + June (4 weeks) = 13 weeks. Quarter 3: July (4 weeks) + August (5 weeks) + September (4 weeks) = 13 weeks. Quarter 4: October (4 weeks) + November (5 weeks) + December (4 weeks) = 13 weeks.
Julius Caesar's astronomers explained the need for 12 months in a year and the addition of a leap year to synchronize with the seasons. At the time, there were only ten months in the calendar, while there are just over 12 lunar cycles in a year.
For example, the 4-4-5 accounting cycle means that in each quarter, the first financial period consists of the first four weeks, the second period consists of the next four weeks, and the third period consists if the next five weeks.
Fall semester: usually starts in August or early September and ends just before winter break. It often includes Thanksgiving and other holiday breaks.
Q4 (the fourth quarter) starts on October 1st and includes the last three months of the year: October, November, and December, ending on December 31st. This applies to the standard calendar year and many fiscal years, though some companies or governments (like the US federal government) have different fiscal calendars.
The Julian calendar is the one that was introduced in the year 46 BC by Julius Caesar to all of the Roman Empire, and it is the calendar that was used during the life of Jesus Christ and at the time of the early Church.
Q4, or the fourth quarter, is the last quarter of the financial year for companies. The Q4 dates for most companies follow the calendar year, starting on Oct. 1 and ending on Dec. 31.
2025 (MMXXV) was a common year starting on Wednesday of the Gregorian calendar, the 2025th year of the Common Era (CE) and Anno Domini (AD) designations, the 25th year of the 3rd millennium and the 21st century, and the 6th year of the 2020s decade.
Since some of the Roman months were named in honor of divinities, and as April was sacred to the goddess Venus, her Veneralia being held on the first day, it has been suggested that Aprilis was originally her month Aphrilis, from her equivalent Greek goddess name Aphrodite (Aphros), or the Etruscan name Apru.
May is the fifth month of the year in the Gregorian calendar. It is named after Maia, the Roman goddess of growth and fertility. May is the first month of spring in the Northern Hemisphere and autumn in the Southern Hemisphere.
To rectify this problem, Gregory ordered churches to drop ten days from that year's calendar, so that Thursday, October 4, 1582, was followed by Friday, October 15. (The pope chose October because it was a month with few holidays or official conflicts in the church.)
According to the meteorological definition of seasons, which is based on temperature cycles and the Gregorian calendar, the first day of fall is usually considered to be September 1 in the Northern Hemisphere (March 1 in the Southern Hemisphere).
Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.
In the Northern Hemisphere, this is the June solstice (20 or 21 June) and in the Southern Hemisphere, this is the December solstice (21 or 22 December). Since prehistory, the summer solstice has been a significant time of year in many cultures, and has been marked by festivals and rituals.
With a 4-4-5 calendar, the standard 52-week year is divided into four 13-week quarters, which comprise three periods split into a four-week, four-week, five-week format.
Gregorian calendar has no system of remembering which months have 31 days and which have 30. Unequal Quarters: Each quarter of the year has different number of days which again makes statistical comparison among quarters difficult.
Quarters are always three months long, regardless of a company's schedule.
Undecimber or Undecember is a name for a thirteenth month in a calendar that normally has twelve months.
Thus, Pope Gregory XIII introduced a revised calendar in 1582. In addition to solving the issue with leap years, the Gregorian calendar restored January 1 as the start of the New Year.
The papal bull issued by Pope Gregory XIII in 1582 decreed that 10 days be skipped when switching to the Gregorian calendar. However, only five countries adopted the new calendar system that year—namely, Italy, Poland, Portugal, Spain, and most of France.