I was trying this one but doesn't seem to work for me. I took reference from here. And below is my code:
$today = date('Y-m-d');
$date = new DateTime();
$R1D2 = $date->setISODate($year,$week,1)->format('Y-m-d');
<td width="14.285%" <?php if ($R1D2 = $today): ?> style="background:#EEEEEE" <?php endif ?>>some content here </td>
The result is, all the cells changes its background even if it's not equal with $today