Returns all the dates between the start date and end date, including both.

getDatesInRange.js

function getDatesInRange(startDate, endDate) {
    if(!startDate || !endDate) return null;

    startDate = new Date(startDate);
    endDate = new Date(endDate);
    const date = new Date(startDate.getTime());
    const dates = [];

    while (date <= endDate) {
        dates.push(new Date(date));
        date.setDate(date.getDate() + 1);
    }

    return dates;
}