in reply to Convert Week Of Year to Date

First, the 5th week of 2005 doesn't start on 1/23, it starts on 1/30. The first Sunday in 2005 is 1/2, so the first week is 1/2-1/8, second is 1/9-1/15, third is 1/16-1/22, fourth is 1/23-1/29. Unless, of course, the first week of 2005 begins on 12/26/2004 ...

Second, there's only 53 Sundays in 2005, so it should be easy to calculate which ones go where. 

my @sundays = ([]);
my @date = (2005, 1, 1);
$date[2]++ while Day_Of_Week(@date) != 7;

DATE: {
    push @sundays, \@date;
    @date = Add_Delta_Days( @date, 7 );
    last if $date[0] == 2006;
    redo DATE;
}

# Now, $sundays[1] == ( 2005, 1, 2 )
# $sundays[2] == (2005, 1, 9 )
# etc.

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Alternately, you could just do: 

my @sunday_date = Monday_of_Week(Week_of_Year( @starting_date ));
$sunday_date[2]--;

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