equivalently, the first week which has Thursday in this year. Both of these
definitions are the same as saying that the first week of the year must contain
more than half of its days in this year. Accordingly, the week number will
-always be in $1\ldots53$ range ($52$ for non leap years).
+always be in $1\ldots53$ range ($52$ for non-leap years).
The function depends on the \helpref{week start}{wxdatetime} convention
specified by the {\it flags} argument but its results for