javascript addHours list range

addHours.js

Date.prototype.addHours = function(h) {
    this.setTime(this.getTime() + (h * 60 * 60 * 1000));
    return this;
}

var startDate = new Date('Sun Apr 19 2020 07:00:00 GMT+0300 (GMT+03:00)');
var finishDate = new Date('Sun Apr 19 2020 10:00:00 GMT+0300 (GMT+03:00)');

checkedList = []
while (startDate < finishDate) {
    var sTime = startDate.toLocaleTimeString('tr-TR');
    startDate.addHours(1)
    var fTime = startDate.toLocaleTimeString('tr-TR');
    checkedList.push(`${sTime}-${fTime}`)
}
console.log(checkedList)

//(3) ["07:00:00-08:00:00", "08:00:00-09:00:00", "09:00:00-10:00:00"]