Number of the week in the year that occurs, based on a week beginning on Monday (the second argument, 2). Number of the week in the year that occurs, based on weeks beginning on Sunday (default). If you need to, you can adjust the column widths to see all the data. Weeks are according United States calendar rules, Sunday first day and weeks are Sunday to Saturday. For formulas to show results, select them, press F2, and then press Enter. Number of weeks in 2018 year is 52 weeks. If Return_type is out of the range specified in the table above, a #NUM! error is returned.Ĭopy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. If Serial_number is out of range for the current date base value, a #NUM! error is returned. Januis serial number 39448 because it is 39,448 days after January 1, 1900. The default is 1.Įxcel stores dates as sequential serial numbers so they can be used in calculations. A number that determines on which day the week begins. Problems can occur if dates are entered as text. Dates should be entered by using the DATE function, or as results of other formulas or functions. The WEEKNUM function syntax has the following arguments: This system is the methodology specified in ISO 8601, which is commonly known as the European week numbering system. System 2 The week containing the first Thursday of the year is the first week of the year, and is numbered as week 1. System 1 The week containing January 1 is the first week of the year, and is numbered week 1. There are two systems used for this function: Date is the date-time code used by Excel for date and time calculation. ISOWEEKNUM(date) The ISOWEEKNUM function syntax has the following arguments. For example, the week containing January 1 is the first week of the year, and is numbered week 1. Returns number of the ISO week number of the year for a given date. Returns the week number of a specific date. This article describes the formula syntax and usage of the WEEKNUM function Excel for Microsoft 365 Excel for Microsoft 365 for Mac Excel for the web Excel 2021 Excel 2021 for Mac Excel 2019 Excel 2019 for Mac Excel 2016 Excel 2016 for Mac Excel 2013 Excel 2010 Excel 2007 Excel for Mac 2011 Excel Starter 2010 More.
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