![]() Whenever a new month is started, the week counter should reset back to 1. To understand how to fix this, we will go through it step by step. In this example, we want February 1 to be counted as week 1 of February instead of week 5 of January. However, this does not count the 1 st of the month as a new week when it doesn’t fall on a Monday. You will notice that the values rum from week 1 to 53 and then resets to week 1 when it starts a new year. The formula for cell C5 now becomes: Cell C5 = WEEKNUM(B5)ĭrag the formula down to the last row (or double click on the lower right corner of the cell). You will have an option to pick any way of the week. serial_number – this is the date you want to convert.Its syntax is: = WEEKNUM(serial_number, ) Case 1: Using the WEEKNUM() function to start a new week every 1st of the monthĮxcel’s WEEKNUM() function is used for Case 1. While Case 2 starts counting the first full week of the month starting on a Monday. if the 1 st day of the month falls on a Friday, or if the last day of the month falls on a Monday). In Case 1, it is possible to have a week with only 1 weekday (e.g. Case 2: February 1 is still counted as Week 5 of January.Case 1: February 1 is counted as Week 1 for February.Taking the end of January and the beginning of February as an example, where January 31 is on a Tuesday and February 1 falls on a Wednesday: Whichever case you are going with for, the report will decide the approach to count the week number. Other format type are yyyy for year and mmmm for the month. In this example, we will use “dddd” to display the weekday (Sunday, Monday, etc). Januis equivalent to 1 and as each day passes, it increments by 1. To give you an idea, dates are pure numbers. In the Type, you can choose however you want the data to be displayed. Press CTRL + 1 to display the Format Cells window.Īlternatively, you can right click on the cell and select Format Cells. To set this up, equate it to the date and merely change the formatting of the cell. ![]() Take this data set which has the dates from January 1, 2017, to the beginning of the year 2018 as an example: Setting up the dataįor the sake of demonstration and checking, I have used a Weekday column (A) to show that there is no week count for days that fall on weekends. This function doesn’t have a second argument – it’s programmed to return the right week number according to the ISO standard.Īs you can see, the old WEEKNUM function is risky, and there is no reason to use it anymore.There are different approaches to creating reports which involve getting the week numbers for each month.īefore jumping in and creating the report, you will have to think about how you’ll handle the cutoff week.ĭo you always want to start in week 1 the moment you get to the first of the month?ĭo you consider the last days of January and the first days in February to all be in week 5? If you forget the second argument in the formula, Excel will assume that you want option 1.įinally, in Excel 2013, Microsoft introduced a new function: ISOWEEKNUM. The ISO system is commonly known as the European week numbering system, and since week numbers are used a lot in Europe, the old and confusing WEEKNUM function, where you have to choose return type 21, has caused countless errors in a large number of companies and governments across Europe. – Return type 21 was introduced in Excel 2010, and this is the official ISO Week Date System where the week starts on Monday and the week containing the first Thursday of the year is considered week 1. With option 1, the week begins on a Sunday, with option 2 the week begins on Monday, option 11 is Tuesday, 12 is Wednesday, etc. – The return types 1, 2, 11, 12, 13, 14, 15, 16 and 17 are all based on the rule that the week of January 1st is week 1. The old WEEKNUM function has 8 options for return type in its second argument: ![]() The week numbers on the picture above are calculated according to the official ISO standard, where the week starts on a Monday and the week containing the first Thursday of the year is considered week 1. This is the default definition if you use the WEEKNUM function in Excel In that case, week number 1 would only have one day in 2022, because January 1st is a Saturday, and the week number changes on Sunday, January 2nd. According to one definition, January 1st would always be in Week number 1, and then the week number changes every Sunday. There are different ways to define the week number of a specific date.
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