I can not understand where I made a mistake in DateTime?

Question

PHP

<?php
$currentDateTime = new DateTime("now", new DateTimeZone("Europe/Kiev"));

if(isWeekend($currentDateTime)){
    _e( "Сообщение в выходной", 'woocommerce' );
}else{
    if (isBeforeAM($currentDateTime)) {
    _e( "Сообщение до обеда", 'woocommerce' );
    }else{
    _e( "Сообщение после обеда", 'woocommerce' );
      }
  }


function isWeekend($currentDateTime) {
    if (isFridayWeekend($currentDateTime)) {
        return true;
    }
    return $currentDateTime->format('N') >= 6;
}
function isBeforeAM($currentDateTime){
    $currentTimeStamp = $currentDateTime->getTimestamp();
    $timeStamp = strtotime(date('Y-m-d') . "13:00");
    return $currentTimeStamp < $timeStamp ;
}
function isFridayWeekend($currentDateTime){
    return $currentDateTime->format('N') == 5 && isBeforeAM($currentDateTime);
}

?>

Sending messages is not correct, sends not what it should on weekdays