This first week then contains two days of the old year (Monday and Tuesday) and five days of the new year (Wednesday to Sunday). If January 1 falls on a Wednesday, the first calendar week begins on Monday, December 30.Two examples of the first week number according to ISO 8601 The first calendar week of a year is the week that contains the first Thursday in January. The first calendar week of a year is the week that contains at least four days of the new year.This means that up to three days from the previous year may be included in the first week of the current year, and up to three days from the current year may be included in the last week of the previous year. Weeks start on a Monday, and the first week of the year includes January 4. The international ISO 8601 definition of a week is used mainly in European and Asian countries for numbering weeks: Select the method of week number calculation.Īvailable are "International according to ISO", "North American calculation" and the "Arabic calculation", which are describedĬalculator ↑ Contents ↑ Calculation methods supported by the Week Number Calculator International calculation according to ISO Please enter the year of the week number for the calculation of week start and week end. Please enter the week number for the calculation of week start and week end. Week number entries / calender week Week number Please enter the year for the week number. Please enter the month for the week number calculation. Please enter the day, i.e., the day of the month for calculating the week number. Please select the value that you want to calculate.Īfter selecting "Week number", the week number is calculated for the entered date.Īfter selecting the "start and end of a week number" the start and end date for the entered week number are calculated. Calculator ↑ Contents ↑ Tips for Making Entries in the Week Number Calculatorĭepending on the selection made in the input of the calculator, different input fields open, which we describe in the following.
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