![]() The simplest way to avoid this is to add 6 days to the DayofYear value for our Thursday, then divide the result by 7 to get our integer value. The integer value of 7/7 is 1, and if we added 1 to this it would give us a first week of the year as 2, which obviously isn’t correct. The 1st Thursday of 2016 was January 7th (7th day of the year). You might think we could just add 1 to this value, but this doesn’t work either. ISO Week Numbers start at 1, so 0 is an invalid value. the integer value of 2/7 is 0 (in integer maths everything after the decimal point is ignored). In 2020, the first Thursday was 2nd January which is Day 2 of the year. You would think that you could just divide the value by 7 and get the week number, but its not that simple. Compose ISO Week Number – To calculate the week number, we need to first find out what day of the year the Thursday is on, and we can do that with the dayofyear expression. The expression is constructed as follows:ĪddDays(outputs('Start_of_Week_(Monday)'),3)Ĥ. As we know a Sunday will be a 0, we also add in an IF condition to set the value to subtract to 6 if the day is a Sunday. To calculate Monday we subtract the dayofweek value of our trigger date minus 1 to get a total amount of days to subtract. Power Automate numbers days of the week beginning from Sunday, where Sunday is 0, Monday is 1, etc. Compose Start of Week (Monday) – as we know that ISO weeks always start on a Monday, we want to work out the Monday of the week our trigger date is in. Manually trigger a flow – to demonstrate the Flow I’m just using a manual trigger with a Date inputĢ. I went through a lot of trial and error to work this out, but what I’ve ended up with below is a solution that I’ve tested successfully against over 1,000 randomly generated dates and it has been 100% correct.ġ. Now that we know the key elements of ISO Week Dates, we can get our thinking caps on. The Wikipedia article on ISO Week Dates has some great information if you’re not familiar with it. The first ISO week of a year is the first week that contains the first Thursday of the Gregorian calendar.An ISO week-numbering year will have either 52 or 53 full weeks.For example, use DATE (2008,5,23) for the 23rd day of May, 2008. Dates should be entered by using the DATE function, or as results of other formulas or functions. There are a couple of things to be aware of when trying to work out the ISO Week Number: Syntax WEEKNUM (serialnumber, returntype) The WEEKNUM function syntax has the following arguments: Serialnumber Required. I’m not the kind of person to back down from a challenge though, so I decided to see if I could figure out an easy solution to this problem. If I was using Excel, I could find out the week number for a date using the ISOWEEKNUM function, so it’s a bit frustrating that I can’t do it this easily in Power Automate. For our examples, we will be using the default.An issue that a lot of users have faced with Power Automate is the inability to find out the ISO 8601 Week Number for a given date this was raised as an idea in the Power Apps Ideas forum back in 2017, and you can find numerous questions about it on the Power Automate forums, but a lot of the answers I’ve seen are incomplete or are overly complex. The return type parameter specifies which day of the week is used to start a new week number.There are a couple of interesting points to take note of the WEEKNUM Formula: =WEEKNUM( date wherein the week number will be retrieved, )ĭo you need to retrieve the week number from a given date? The WEEKNUM Formula in Excel is perfect for this! ![]() As Type 1 represents days ranging from 1 (Sunday) to 7 (Saturday). DATE (2016,1,1) WEEKDAY (DATE (2016,1,1), 1) + 1 + (WK 1)7 The Max Function is to avoid the first day in the first week falls in the year before (e.g., December 27, 2015). ![]() We get a result of 7 here, which signifies a Saturday. To get the first day of any week in 2016, please use the formula below. Several week numbering systems exist and so WEEKNUM. Type in 1 to get the number of the day of the week Determines the week number for a date specified either by a date-time serial number or in a text string. Select the date you have entered =WEEKDAY(B13, ![]()
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