It's giving you as much info as you gave it to use.

'%D' is a shortcut for '%m/%d/%y'. '%M' is the minute as a decimal (0-59). '%b' is abbreviated month name. '%Y' is the year with century as a decimal. See man strptime.

# derived from your post
my $date = '3/11/16, 00, Mar, 2016';
$date1 = Time::Piece->strptime($date, '%D, %M, %b, %Y');
print "'$date' parses to '$date1'\n";
__END__
'3/11/16, 0, Mar, 2016' parses as 'Fri Mar 11 00:00:00 2016'
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Update: Fixed print and added output.