Uge Ma Ti On To Fr
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36 567891011
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38 19202122232425
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print notes:
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day of week:
iso8601 week number:

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Calculate day and week number for a given date

Background about ISO 8601

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

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© Guido Socher, License: GPL, guidosocher at, Version: 2009-11-13