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kennethk
<p>What have you tried? What worked? What didn't? Code is always appreciated. See [id://174051].
<p>When I need to do date-based math, I reach for [mod://DateTime]. Which, in fact, will pretty much do what you need.
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<p>#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.</p>
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