use POSIX qw(strftime);

$string = 'hailed an über ‘cab’ on ';
@t = (0, 0, 0, 23, 5, 2020, 4);

print $string . strftime( '%d/%b',  @t), "\n";
print $string . strftime( '%d %b',  @t), "\n"; # UTF-8 nbsp
print $string . strftime('‘%d %b’', @t), "\n"; # UTF-8 nbsp
print $string . strftime('‘%d %b’', @t), "\n"; # ASCII space