![]() But what if you are looking for the opposite, i.e. How to convert week number to date in ExcelĪs you have just seen, it's no big deal to turn a date into a week number using the Excel WEEKNUM function. Most often you would use it in combination with other functions to perform various calculations based on the week number, as demonstrated in further examples. In real-life scenarios, the Excel WEEKNUM function is rarely used on its own. ![]() The above formula returns 16, which is the number of the week containing April 15, 2015, with a week beginning on Monday. Instead of referring to a cell, you can specify the date directly in the formula by using the DATE(year, month, day) function, for example: If you'd rather begin with some other day of the week, say Monday, then use 2 in the second argument: In the above formula, the return_type argument is omitted, which means that the default type 1 is used - the week beginning on Sunday. The following screenshot demonstrates how you can get week numbers from dates with the simplest =WEEKNUM(A2) formula: Excel WEEKNUM formulas to convert date to week number (from 1 to 54) Return types 11 through 21 are supported in Excel 2010 and Excel 2013 only. In Excel 2007 and earlier versions, only options 1 and 2 are available. It is commonly known as the European week numbering system and it is used mainly in government and business for fiscal years and timekeeping.Īll of the return types listed above apply to System 1, except for return type 21 that is used in System 2. In this system, the week starts on Monday and the week containing the first Thursday of the year is considered week 1. This is the ISO week date system that is part of the ISO 8601 date and time standard. In this system, the week traditionally starts on Sunday. The week containing January 1 is considered the 1 st week of the year and is numbered week 1. In the WEEKNUM function, two different week numbering systems are used: Monday (used in System 2, please see the details below.) Here is a complete list of the return_type values supported in WEEKNUM formulas. If omitted, the default type 1 is used (the week beginning on Sunday). Return_type (optional) - a number that determines on which day the week begins. ![]() This can be a reference to a cell containing the date, a date entered by using the DATE function or returned by some other formula. Serial_number - any date within the week whose number you are trying to find.Meaning Tuesday will have 2 and Saturday 6 (according to our start of the week). Formula syntaxe isĪnd the result is simply a serial number of the day in week. Function is guided by local Excel version. It returns serial number of day in week to entered date. System 2 – is according to ISO 8601 norm, also called European week notation system System 1 – first week marked by number 1 is the week in which the data 1st January is present Type means given type in the function formula WEEKNUM. Function haves this syntax:Īnd the code is determining the number of the week calculation system according to this key: type But what about Anglo-Saxon lands where the week starts by Sunday? We will use function WEEKNUM.įunction WEEKNUM also returns number of the week in the year but it is possible to state which system will be used to calculate the week number. For Czech location, it means that the week starts by Monday. This function calculates with default Excel settings. Meaning that the entered date was in 25th week of the year. For example for formula =ISOWEEKNUM(“”) you will get 25 as result. If the New year falls on Sunday, the 1st week starts on 1st Monday.īack to Excel. New year must be on Thursday and 2nd of January is workday. This means that first week of the year is the one containing at least one workday. The result of the function is the number of the week in year according to ISO 8601 standard. Either enter the date into quotes or link to the cell. Its syntaxe is very simple:Īnd you do not need anything else. The premise for use of these function in Date and time group are cells containing data type Date. It is definitely more effective than searching in calendar. MS Excel will help by three functions – WEEKNUM, ISOWEEKNUM,WEEKDAY. ![]() You need to find out which date is after 20th week of the year or if a certain date is Friday. You have a huge table with many date entries in it.
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