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National standard format is yyyy-mm-dd. [161] dd.mm.yyyy format is used in some places where it is required by EU regulations, for example for best-before dates on food [162] and on driver's licenses. d/m format is used casually, when the year is obvious from the context, and for date ranges, e.g. 28-31/8 for 28–31 August.
A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 February 2025" is ten days after "15 February 2025".
For dates before the year 1, unlike the proleptic Gregorian calendar used in the international standard ISO 8601, the traditional proleptic Gregorian calendar (like the older Julian calendar) does not have a year 0 and instead uses the ordinal numbers 1, 2, ... both for years AD and BC. Thus the traditional time line is 2 BC, 1 BC, AD 1, and AD 2.
For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given. The first Hijri year (AH 1) was retrospectively considered to have begun on the Julian calendar date 15 July 622 (known as the 'astronomical' or 'Thursday' epoch, Julian day 1,948,439) or 16 July 622 (the ...
A year in the Islamic lunar calendar consists of twelve lunar months and has only 354 or 355 days in its year. Consequently, its New Year's Day occurs ten days earlier each year relative to the Gregorian calendar. The year 2025 CE corresponds to the Islamic years AH 1446 – 1447; AH 1446 corresponds to 2024 – 2025 in the Common Era. [a]
As 2025 gets started, planning for the year is in full swing. Here is a list of 2025 holidays, special events, big games, cultural milestones and other key dates to mark on your calendar ...
The calendar's epoch (first year) corresponds to the Hijrah in 622 CE, which is the same as the epoch of the Lunar Hijri calendar but as it is a solar calendar, the two calendars' year numbers do not coincide with each other and are slowly drifting apart, being about 43 years apart as of 2023.
When using the Gregorian calendar, both YYYY-MM-DD (2025-02-10) and DD/MM/YYYY (10/02/2025) format can be used. While the DMY format (10 February 2025) is used when writing full Gregorian dates, the MDY format (February 10, 2025) is also acceptable. All government documents need to be filled up in the YYYY-MM-DD format. [2]