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Window Mode ISO 8601 Calendar −

WK Mo Tu We Th Fr Sa Su                                                                                                             Calendar Range: 01.01.1600 to 31.12.99999

Calendar week numbers according to ISO 8601

Background about ISO 8601

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ISO 8601 defines the week as always starting with Monday. The first week is the week containing the first Thursday of the calendar year.
This implies that it is the week which is mostly within the calendar year and the week with January 4^th in it.

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