problem using 'date' coreutil

[bernard]

The year 2006 started on Sunday.  This week, according to man page,
"date +%U" should return "48" (week of year with Sunday being first day
of the week).  However, "date +%W" and "date +%V" should both return
"49" (week of year with Monday being first day of the week).

All three are returning "48", and it is a problem.  What am I missing?

thanks,
Bernard Moore
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