Udesign, Видимо так:
function dateTime($date)
{
$sek = time() - $date;
if ($sek == 0) {
$bbb = '<span class="green"> [on]</span>  ';
} elseif ($sek < 60) {
$bbb = '<span class="green"> ['.$sek.'s]</span>  ';
} elseif ($sek > 60 && $sek < 120) {
$bbb = '<span class="green"> [1m]</span>  ';
}else{
$bbb = '<span style="color:red;"> [Off] </span>  ';
}
return $bbb;
}