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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 July 2024" is ten days after "15 July 2024". The date of a particular event depends on the observed time zone.
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
Calendar. A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. [ 1][ 2][ 3] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.
The Lunar Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. The astronomer's mean tropical year , which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the year in most calendars.
The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.
Roman calendar. The Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used inclusively of the Julian calendar established by the reforms of the Dictator Julius Caesar and Emperor Augustus in the late 1st century BC.
February 15: Susan B. Anthony Day. March 10: Harriet Tubman Day. March 19: National Day of Honor [5] March 25: Greek Independence Day [6] March 29: National Vietnam War Veterans Day [7] [8] March 31: Cesar Chavez Day [9] March 31: Transgender Day of Visibility [10] April 6: National Tartan Day.
A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of three general variations: Fourteen one-year calendars, plus a table to show which one-year calendar is to be ...