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#returns the week number of the date input
$week = Week_of_Year($year,$month,$day); 
#returns the date of the monday of the week input
($year,$month,$day) = Monday_of_Week($week,$year);

- get $begin_day, $begin_month, $begin_year and $end_day, $end_month, 
+$end_year  from form input

...
     }
$monday_date = $monday_date +7;
}