![]() ![]() #Calender week number iso#The system does not need the concept of month and is not well connected with the Gregorian system of months: some months January and December are divided over two ISO years. is 2009-W53-4 (ISO year 2009 is a leap year, extending the Gregorian year 2009, which starts and ends with Thursday, at both ends with three days)Įxamples where the ISO year is three days into the next Gregorian year.is 2008-W01-2 (Gregorian year 2008 is a leap year, ISO year 2008 is 2 days shorter: 1 day longer at the start, 3 days shorter at the end).is 2007-W01-1 (both years 2007 start with the same day).If 31 December is on a Monday, Tuesday, or Wednesday, it is in week 01, otherwise in week 52 or 53.the week ending with the Sunday in the period 28 December - 3 January.the week with the Thursday in the period 25 - 31 December.the week starting with the Monday in the period 22 - 28 December. ![]()
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