Abi_test.js

const readline = require('readline');

const readInterface = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

function getLastMondayMonths(startYear, endYear) {
    if(!endYear) {
        endYear = startYear;
    }
    if (startYear > endYear) {
        console.log("Starting year must be smaller or equal to the ending year.\n");
    } else {
        let date = new Date(startYear, 1, 0);
        let dates = "";
        while (date.getFullYear() <= endYear) {
            for(let month = 1; month <= 12; month++){
                let tempDate = new Date(date.getFullYear(), month, 0);
                if(tempDate.getDay() === 1) {
                    dates += " " + (tempDate.getMonth() + 1) + "/" + tempDate.getDate() + "/" + tempDate.getFullYear();
                }
            }
            date.setFullYear(date.getFullYear() + 1);
        }
        return dates.substr(1);
    }
}

readInterface.question("Type starting year: ", (year) => {
    readInterface.question("Type ending year: ", (end) => {
        console.log(getLastMondayMonths(year, end));
        process.exit();
    })
})