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What week number are you referring to? Is it the week number on a month or the whole year?
We do not have a direct function that presents a week number, but if you are familiar with its formula, I believe you can use the form calculation widget or the conditional logic to get it. Here are the guides that might help:
We'll wait for your response.
I refer to the weeknumber each year has 52 or 53 weeks. Like this year 2 jan 2017 - 8 jan 2017 is week 1 of this year.
Unfortunately, we do not have an existing function or example to provide you with. In theory, it might be possible to use some set of calculation rules to calculate the week number depending on one of the standards, but we still cannot guarantee that.