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The world in 300. Year 300 was a leap year starting on Monday of the Julian calendar.At the time, it was known as the Year of the Consulship of Constantius and Valerius (or, less frequently, year 1053 Ab urbe condita).
360-day calendar used for accounting; 365-day calendar used for accounting; Unix time, number of seconds elapsed since 1 January 1970, 00:00:00 (UTC). Julian day, number of days elapsed since 1 January 4713 BC, 12:00:00 (UTC). Heliocentric Julian Date, Julian day corrected for differences in the Earth's position with respect to the Sun.
Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the original Anno Domini (AD) and Before Christ (BC) notations used for the same calendar era. The two ...
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.
A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. [1] For example, the current year is numbered 2025 in the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).
The Gregorian calendar is the calendar used in most parts of the world. [ 1 ] [ a ] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII , which introduced it as a modification of, and replacement for, the Julian calendar .
The categorisation of the past into discrete, quantified named blocks of time is called periodization. [1] This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept).
The association reorganised in 2005 as The World Calendar Association, International. [5] It was last active on 2013 as it had resumed efforts towards adoption of the World Calendar in 2017 and 2023. [6] The World Calendar Association's last director was Wayne Edward Richardson of Ellinwood, Kansas who died on 29 May 2020. [7]