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. For formulas to show results, select them, press F2, and then press Enter. 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: Calculating a rolling average in Excel manually. This system is the methodology specified in ISO 8601, which is commonly known as the European week numbering system. First of all we want to use the current Week No as a base value, we need to check if our formula has. 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: The WEEKNUM function starts counting on the week. For example, the week containing January 1 is the first week of the year, and is numbered week 1. The Excel WEEKNUM function takes a date and returns a week number (1-54) that corresponds to the week of year. Returns the week number of a specific date. This article describes the formula syntax and usage of the WEEKNUM function Make sure to download the accompanying spreadsheet so you can see this in action.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. The main thing is to remember that the number that is output for a given day can be changed you should not blindly trust the output of this function if it was created by someone other than yourself. I almost always put a 2 in for the return_type argument for the WEEKDAY function because it just seems to make more sense that the first day of the regular work week should be 1. Please note that the formula returns the date as a serial number, and to have it displayed as a date, you need to format the cell accordingly. Type a comma to go to the next argument and then type a number for the corresponding option or select it from the drop-down menu that appears:īy putting a 2 in for the second argument, you can see that Sunday is now the 7th day of the week for this calculation. The formula to return the Start date of the week is as follows: DATE (A2, 1, -2) - WEEKDAY (DATE (A2, 1, 3)) + B2 7 Where A2 is the year and B2 is the week number.Select the cell that contains the date:.This is almost exactly the same as the above example except that we now use the second argument. Return the Day of the Week with Different Starting Numbers Look to the example below to change which day starts the week. Make sure you have a cell with a date in it.īy default, Sunday is the first day of the week.Numbers 1 (Thursday) through 7 (Wednesday). Numbers 1 (Wednesday) through 7 (Tuesday). Behaves like previous versions of Microsoft Excel. There are 10 different values that can be entered for the return_type argument. Return_type Arguments for the WEEKDAY Function Look below for a full list of options for this argument. ![]() If you put a 2 in for this argument, Monday will be 1 and Sunday will be 7. If you leave this argument empty, Sunday will be 1 and Monday will be 2 etc. This argument tells the function how to number the days of the week. If you want, you can also enter the date by hand using the DATE() function, but that is almost never recommended as it makes the spreadsheet harder to use and maintain. You simply need to reference a cell that contains a date for this argument to work. ![]() ![]() This is the date that you want to use for the calculation.
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