That (to me then unknown) fact that the anglo-american world counts the weeks of the year differently from Europe has once required a very expensive upgrade to one of my web-apps and a lot of very unhappy clients.
In most software the default is the anglo-american count, you need to explicitly ask for the ISO 8601 count.
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[ 4.7 ms ] story [ 15.2 ms ] threadIn most software the default is the anglo-american count, you need to explicitly ask for the ISO 8601 count.