8/10/2023 0 Comments 2013 calendar with week number![]() However, if January1 falls on a Friday, the first calendar week begins on Monday, January 4.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. See ISO week date (wikipedia) to learn more about week numbering.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. Using the 4 day option is probably the most common and is true to ISO standards (although choosing other than Sunday or Monday for the first day of week might confuse Outlook.) Most governments and corporations will follow the ISO standard. In Outlook there are 3 options - start on Jan 1, on the first full week, or the first 4 day week. The first week of the new year often brings questions about which week should be used to start numbering. Outlook fun fact: Outlook has the world ending on (the last date for appointments) More on week numbering. The underlying data is correct and the week number shown on the navigation calendar is half correct when you view both Dec 2012 and Jan 2013, only the number drawn on the calendar is wrong. Outlook numbers the weeks correctly when the week is set to start on Sunday (set in Tools, Options, Calendar options) but gets confused when the week starts on Monday. So where is week number 1 of the year 2013?" The following week however has week number 2. 2012 to 06 January 2013 has week number 53. Now if I look at the Outlook calendar and browse towards January 2013 I see something strange: The week from 31 Dec. "How does Outlook calculate the week numbers? In my part of the world, the first day of the week is Monday.
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