function calculateparking() {
  var resultScreen = document.getElementById("parking-fee");

  var calculatorType = document.getElementById("calculator-type");

  var startdate = document.getElementById("parking-start").value;

  var enddate = document.getElementById("parking-end").value;

  var starthour = document.getElementById("start-hours").value;

  var endhour = document.getElementById("end-hours").value;

  var startminute = document.getElementById("start-minute").value;

  var endminute = document.getElementById("end-minute").value;

  var startdatepieces = startdate.split(".");

  var startdateobj = new Date(
    startdatepieces[2],
    startdatepieces[1] - 1,
    startdatepieces[0],
    starthour,
    startminute,
    0,
    0
  );

  var starttime = parseInt(startdateobj.getTime() / 60000);

  var enddatepieces = enddate.split(".");

  var enddateobj = new Date(
    enddatepieces[2],
    enddatepieces[1] - 1,
    enddatepieces[0],
    endhour,
    endminute,
    0,
    0
  );

  var endtime = parseInt(enddateobj.getTime() / 60000);

  var t = endtime - starttime;

  if (t < 0) {
    resultScreen.value = 0;

    return false;
  }

  var days = parseInt(t / (60 * 24));

  switch (calculatorType.options[calculatorType.selectedIndex].value) {
    case "first": // lühiajaline parkimine
      if (t <= 15) {
        resultScreen.value = 0;
      } else if (t <= 30) {
        resultScreen.value = 2;
      } else if (t <= 60) {
        resultScreen.value = 3;
      } else if (t <= 60 + 30) {
        resultScreen.value = 4;
      } else if (t <= 60 * 2) {
        resultScreen.value = 5;
      } else if (t <= 60 * 2 + 30) {
        resultScreen.value = 6;
      } else if (t <= 60 * 3) {
        resultScreen.value = 7;
      } else if (t <= 60 * 3 + 30) {
        resultScreen.value = 8;
      } else if (t <= 60 * 4) {
        resultScreen.value = 9;
      } else if (t <= 60 * 4 + 30) {
        resultScreen.value = 10;
      } else if (t <= 60 * 5) {
        resultScreen.value = 11;
      } else if (t <= 60 * 24) {
        resultScreen.value = 15;
      } else {
        if (!(t % (60 * 24))) resultScreen.value = 15 + days * 5 - 5;
        else resultScreen.value = 15 + (days + 1) * 5 - 5;
      }

      break;

    case "second": // pikaajaline parkimine
      if (t <= 60 * 2 + 30) {
        resultScreen.value = 2;
      } else if (t <= 60 * 5) {
        resultScreen.value = 4;
      } else if (t <= 60 * 24) {
        resultScreen.value = 14;
      } else {
        if (!(t % (60 * 24))) resultScreen.value = 14 + days * 4 - 4;
        else resultScreen.value = 14 + (days + 1) * 4 - 4;
      }

      break;

    case "third": // parkimismaja
      if (t <= 15) {
        resultScreen.value = 0;
      } else if (t <= 30) {
        resultScreen.value = 2;
      } else if (t <= 60) {
        resultScreen.value = 3;
      } else if (t <= 60 + 30) {
        resultScreen.value = 4;
      } else if (t <= 60 * 2) {
        resultScreen.value = 5;
      } else if (t <= 60 * 2 + 30) {
        resultScreen.value = 6;
      } else if (t <= 60 * 3) {
        resultScreen.value = 7;
      } else if (t <= 60 * 3 + 30) {
        resultScreen.value = 8;
      } else if (t <= 60 * 4) {
        resultScreen.value = 9;
      } else if (t <= 60 * 4 + 30) {
        resultScreen.value = 10;
      } else if (t <= 60 * 5) {
        resultScreen.value = 11;
      } else if (t <= 60 * 24) {
        resultScreen.value = 15;
      } else {
        if (!(t % (60 * 24))) resultScreen.value = 15 + days * 5 - 5;
        else resultScreen.value = 15 + (days + 1) * 5 - 5;
      }

      break;
  }
}