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I'm late to the party, but I'm posting this in case other people come to this thread looking for ISO week numbers. I've attached a workflow which has the test values above and a series of calculations that determine the correct ISO week number (basically @JohnJPS's formula broken down into steps--he has the same steps in his own sample workflow.)
A little late to this conversation. I believe the ISO weeks were off in 2015 due to an anomaly that causes a 53 week on most fiscal calendars every 6 years.or so. I am struggling with a similar issue being that I do not have a full date for my weeks from previously stored data. The data is in the format of wk/yyyy is it possible to use the %W or %U Function on this format to make it into weeks?
Are you trying to get the week number from the wk/yyyy format? Since that will be a String and not a Date data type, the Date/Time functions won't work. Instead you could use a Test To Columns tool to split up the two parts and then convert each to a number, either with a Select tool or the ToNumber() function--In the attached workflow, I used a Select tool so that I could rename the columns at the same time.