A number that determines the return value: for example, use 1 when week begins on Sunday, or use 2 when week begins on Monday, or use 21 for ISO week numbers. =WEEKNUM(B5) 2. January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900.If Serial_number is out of range for the current date base value, a #NUM! The WEEKNUM function starts counting with the week that contains January 1. More details in Remarks section. The Excel WEEKNUM function takes a date and returns a week number (1-54) that corresponds to the week of year. B2 * 7 - adds the number of weeks multiplied by 7 (the number of days in a week) to get the Monday (start date) of the week in question. With the date January 5, 2016 in B5, WEEKNUM returns 2 as the...To sum by week number, you can use a formula based on the SUMIFS function. You must have JavaScript enabled to use this form. For more details, see Ron de Bruin's nice write-up on Excel week numbers. Saw in a blog that the function WEEKNUM in Excel 2010 would contain a return type 21 to deal with this - anyone know whether this is going to be available? 复制下表中的示例数据，然后将其粘贴进新的 Excel 工作表的 A1 单元格中。 要使公式显示结果，请选中它们，按 F2，然后按 Enter。 如果需要，可调整列宽以查看所有数据。
If you put in the value 21 (hmmm, ok, why not ) for the second parameter, the WEEKNUM function will return the same result as the function ISOWEEKNUM does in Excel 2013 and later versions.
How...To get the week number from the day from a date, you can use the WEEKNUM function. For formulas to show results, select them, press F2, and then press Enter. In the example shown, the formula in C5, copied down, is: WEEKNUM (
Starting with Excel 2010 for Windows and Excel 2011 for Mac, you can generate an ISO week number using 21 as the return_type: = WEEKNUM( date,21) In Excel 2013, there is a new function called ISOWEEKNUM.
The return_type argument controls which day of the week is used to begin a new week number. Return_type is optional and defaults to 1. The WEEKNUM function starts counting with the week that contains January 1. By default, weeks begin on Sunday. error is returned.Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. WEEKNUM(serial_number,[return_type]) Return_type Week begins on System ... 21 Monday 2 So =WEEKNUM("09/07/2016",21) will calculate as defined in ISO 8601 since Return_type 21 is the only one with System 2. If you need to, you can adjust the column widths to see all the data.Number of the week in the year that 3/9/2012 occurs, based on weeks beginning on Sunday (default).Number of the week in the year that 3/9/2012 occurs, based on a week beginning on Monday (the second argument, 2).
Serial_number (required argument) – This is an Excel date for which we want to return the week number. For example, the week containing January 1 is the first week of the year, and is numbered week 1.The WEEKNUM function syntax has the following arguments:Excel stores dates as sequential serial numbers so they can be used in calculations.
WEEKNUM(serial_number,[return_type]) The WEEKNUM function syntax has the following arguments: Serial_number Required. This thread is locked. Which returns the string "07". With return_type 21, week 1 is the week containing the first Thursday of the year, following The Excel ISOWEEKNUM function takes a date and returns a week number (1-54) that follows ISO standards, where weeks begin on Monday and week number 1 is assigned to the first week in a year that contains a Thursday. A date within the week. When entering the argument, we should enter the date using the DATE function or as a result of other formulas or functions. To pad week numbers (or any number) with zeros using a formula, you can use the TEXT function. =TEXT(WEEKNUM(B5,21),"00") =WEEKNUM (Date,21) Tags: DATE, ISOWEEKNUM, WEEKNUM.