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February's 28 or 29 days is a problem, so the formula rolls January and February around to the end so February's short count will not cause a problem. The formula is interested in days of the week, so the numbers in the sequence can be taken modulo 7.
February 7 to 13: African Heritage and Health Week. February 7 to 14: Congenital Heart Defect Awareness Week. February 12 to 18: National Jell-O Week. February 26 to 29: Ayyám-i-Há. February 28 ...
An especially prominent example, still widely taught in primary schools, is that the Weton for the Proclamation of Indonesian Independence on 17 August 1945 took place on Jumat Legi; this is also the Weton for the birth and death of Sultan Agung, one of the greatest kings of Java and the inventor of the modern Javanese calendar. [6]
"Other non-standard dates are sometimes used in software engineering. For example, Java (specifically the java.util.Calendar class) allows dates such as February 0 (= January 31) and April 31 (= March 1)." Shouldn't the be "April 31 (=May 1)"? March 1 is the beginning of the month before April, May 1 is the beginning of the month after.
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 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.
week_ordinal, weekday, month For days that are observed on the same day of the same week every year, these specify the week (week_ordinal), day of the week (weekday), and month. If you use these, you no longer have to specify date2024, date2025, date2026 and date2027. If you specify week_ordinal, then weekday and month are required also.
February 31 is used (along with February 32 and February 33) for calculating weather data. [18] [19] Other non-standard dates are sometimes used in software engineering. For example, Java (specifically the java.util.Calendar class) allows dates such as February 0 (= January 31) and April 31 (= May 1).