PHP application to JS

I have a php application to calculate table price by each minutes. I would like to migrate to Meteorjs, since function “reactive-var” is great to show at user-side and backend-side.
But how to convert below PHP PriceCalculator to JS? any hint or apps like this?

class PriceCalculator
{
    private $start;
    private $end;
    private $price = [
                      0 => [ 98, 128],
                      1 => [ 88, 118],
                      2 => [ 88, 118],
                      3 => [ 88, 118],
                      4 => [ 88, 118],
                      5 => [ 88, 118],
                      6 => [ 98, 128],
                     'H' => [ 98, 128]                           // holiday prices
                     ];
    private $holidays = [ 
                          '2022-04-15',
                          '2022-04-18',
                          '2022-05-02'
                        ];
    public $periods = [];
    public $total = 0;
    
    public function __construct ($time1, $time2)
    {
        $this->start = new DateTime($time1);
    	$this->start->modify('-1 minute');
        $this->end   = new DateTime($time2);
    }
    
    public function calculate()
    {
        $total = 0;
        $prevday = $prevpk = $prevh = null;
        $inc = new DateInterval('PT1M');
        $min = clone $this->start;
        $min->modify("+1 minute");
        while ($min < $this->end) {
            $day = $min->format('w');
            if (in_array($min->format('Y-m-d'), $this->holidays)) {
                $day = 'H';
            }
            $peak = '02' <= $min->format('H') && $min->format('H') < '18' ? 0 : 1;
            if ($prevday != $min->format('Y-m-d') || $prevpk != $peak) {
                $prevday = $min->format('Y-m-d');
                $prevpk = $peak;
                $prevh = $min->format('d H');
            }
            $this->total += $this->price[$day][$prevpk]/60;
            $min->add($inc);
        }
    }
}

Since you are not using any specific libraries you should be fine with just converting the code to JS. You can even use a class same like in PHP.