php: отображение диапазонов дат недель

function DrawWDiap($start) {
	$week_from=(-$start+date("N")-1)*24*60*60;
	$week_to_work=(-($start+4)+date("N")-1)*24*60*60;
	$week_to=(-($start+6)+date("N")-1)*24*60*60;
	echo "<p>".date("d.m.Y",time()-$week_from)."&nbsp;&mdash;&nbsp;".date("d.m.Y",time()-$week_to_work)." (".date("d.m.Y",time()-$week_from)."&nbsp;&mdash;&nbsp;".date("d.m.Y",time()-$week_to).")</p>";
}
DrawWDiap(0);
DrawWDiap(7);
DrawWDiap(14);
DrawWDiap(21);
DrawWDiap(28);