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Discussion on: Dates are hard folks

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Austin S. Hemmelgarn

The 'YYYY' format is for week number dates (today is 2020-W32-5 per the ISO 8601 week date system). Week number dates are used a lot in manufacturing (or at least, the year and week number is, not the weekday as much) because that makes it easier to trace a given batch of products to a particular shift that was responsible for producing or checking them.