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Note: In this algorithm January and February are counted as months 13 and 14 of the previous year. E.g. if it is 2 February 2010 (02/02/2010 in DD/MM/YYYY), the algorithm counts the date as the second day of the fourteenth month of 2009 (02/14/2009 in DD/MM/YYYY format) So the adjusted year above is:
"Corresponding months" are those months within the calendar year that start on the same day of the week. For example, September and December correspond, because 1 September falls on the same day as 1 December (as there are precisely thirteen 7-day weeks between the two dates).
Where t is the last day of the month, w t is the ISO weekday number of the last day of the month, w 1 is the ISO weekday number of the first day of the month and n and w are as defined above. Examples
5 Examples for all standard week day numbers 6 Examples for week day numbers with extra leading zero 7 Examples for week day number cyclic underflows and overflows, from computed values
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The doomsday's anchor day calculation is effectively calculating the number of days between any given date in the base year and the same date in the current year, then taking the remainder modulo 7. When both dates come after the leap day (if any), the difference is just 365 y + y / 4 (rounded down).