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On 23 Mar 2019, at 15:51, Michael Ossipoff wrote:
The International Standards Organization WeekDate calendar (ISO
WeekDate
Calendar):
.
The calendar year starts with the Monday closest to Gregorian January
1st.
Close. The start of each week is defined as a Monday. The first week of
the year is the first week of the calendar year that contains a
Thursday.
Effectively, the same thing as you describe, but the definition makes no
reference to Monday or January 1st.
Barry
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