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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.
For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.
The week number can be described by counting the Thursdays: week 12 contains the 12th Thursday of the year. The ISO week-numbering year starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks.
The seven-day week was widely known throughout the Roman Empire by the 1st century CE, [36] along with references to the Jewish Sabbath by Roman authors such as Seneca and Ovid. [37] When the seven-day week came into use in Rome during the early imperial period, it did not immediately replace the older eight-day nundinal system. [38]
Monday is the day of the week that takes place between Sunday and Tuesday. [1] According to the International Organization for Standardization's ISO 8601 standard, it is the first day of the week. [2]
d – one-digit day of the month for days below 10, e.g. 2; dd – two-digit day of the month, e.g. 02; ddd – three-letter abbreviation for day of the week, e.g. Fri; dddd – day of the week spelled out in full, e.g. Friday; Separators of the components: / – oblique stroke (slash). – full stop, dot or point (period)-– hyphen (dash ...
Weeks are generally referred to by the date of some day within that week (e.g., "the week of May 25"), rather than by a week number. Many holidays and observances are identified relative to the day of the week on which they are fixed, either from the beginning of the month (first, second, etc.) or end (last, and far more rarely penultimate and ...
In many European countries, calendars show Monday as the first day of the week, [11] which follows the ISO 8601 standard. In the Persian calendar, used in Iran and Afghanistan, Sunday is the second day of the week. However, it is called "number one" as counting starts from zero; the first day - Saturday - is denoted as day zero.