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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.
3.4 Highlight a week, a day of the week, or a day, or a date, or hide display of the week column
The month of the calendar displayed is determined by m.. If m is specified, then the year can be specified with y, the default is the current year.; If m is not specified but 1 is a valid time the month and/or year is set to match the title, the default is the current month and/or year.
The first ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is ending; if three, they are Monday, Tuesday and Wednesday. Similarly, the last ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is starting; if three, they are Friday, Saturday, and Sunday.
Selecting a date format, such as the international ISO 8601 (YYYY-MM-DD) or other formats such as the American (MM/DD/YYYY) or European (DD.MM.YYYY) Selecting a week count method and week format, such as the international ISO weeks (Monday is the first day of the week, week 1 starts in the first four-day week of the year). In addition to the ...
A leap week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are proposed reforms to the civil calendar, in order to achieve a perennial calendar. Some, however, such as the ISO week date calendar, are simply conveniences for specific purposes. [1]
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 March 2025" is ten days after "15 March 2025".
The 14 calendars discussed in the first edition of the book included the Gregorian calendar, ISO week date, Julian calendar, Coptic calendar, Ethiopian calendar, Islamic calendar, modern Iranian calendar, BaháΚΌí calendar, French Republican calendar, old and modern Hindu calendars, Maya calendar, and modern Chinese calendar.