Børge wrote:
most adults and many teenagers know that a year has 52 or 53 weeks, and that they are numbered starting with 1. Exactly which week number it is at a given time is probably not common knowledge,
That's pretty much the way it is in the U.S. We sometimes refer to "the third full week in April", but no one here ever refers to the week of the year.
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I cannot remember the last time I saw a calender not also stating week numbers.
I've NEVER seen a calendar that shows week numbers. A few have the Julian day of the year for each day (in very tiny print), and perhaps the number of days left in the year, but that's all.
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In dry summers, watering restrictions applied, so that owners of even numbered houses were allowed only to water their garden in even numbered weeks, and owners of odd numbered houses only in odd numbered weeks.
In the U.S., watering restrictions are based on even-numbered or odd-numbered days.
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After graduating from university, I started working for Control Data Corporation (CDC). There I really became aware of week numbers.
My father also worked for CDC while I was growing up, but I don't ever remember him mentioning week numbers. For most people that wouldn't be particularly surprising, but for him, I'm surprised that he wouldn't consider it essential for me to know the week numbers if he used them at work.