=$iStart;$i--) {
$tempTime=$currDate5-$i*300;
$dt = new DateTime("@$tempTime");
$urlImg="https://www.nea.gov.sg/docs/default-source/rain-area/dpsri_70km_".$dt->format('YmdHi0000')."dBR.dpsri.png";
$classIdx=$i-$iStart;
if($classIdx > 9) $classIdx=9;
echo "