johngg@shiraz:~/perl/Monks$ perl -Mstrict -Mwarnings -MTime::Piece -MTime::Seconds -E '
my $endEpoch = Time::Piece->strptime( q{2020/06/01}, q{%Y/%m/%d} )->epoch();

my $ffJan = Time::Piece->strptime( q{2020/01/01}, q{%Y/%m/%d} );
$ffJan   += ONE_DAY for 1 .. 5 - $ffJan->day_of_week();

while ( $ffJan->epoch() < $endEpoch )
{
    say $ffJan->strftime();
    $ffJan += ONE_WEEK;
}'
Fri, 03 Jan 2020 00:00:00 UTC
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