day_of_the_programmer.js

// boiler plate for js 
'use strict';

const fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}

/*
 * Complete the 'dayOfProgrammer' function below.
 *
 * The function is expected to return a STRING.
 * The function accepts INTEGER year as parameter.
 */

function dayOfProgrammer(year) {
    // Write your code here
     if (year <= 1917) {
    if (year % 4 === 0) {
      return "12.09." + year;
    } else {
      return "13.09." + year;
    }
  } else if (year >= 1919) {
    if (year % 400 === 0 || (year % 4 === 0 && year % 100 !== 0)) {
      return "12.09." + year;
    } else {
      return "13.09." + year;
    }
  } else {
    return "26.09." + year;
  }

}

function main() {
    const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

    const year = parseInt(readLine().trim(), 10);

    const result = dayOfProgrammer(year);

    ws.write(result + '\n');

    ws.end();
}