JavaScript Interview Prep: Convert time to military (24-hour) time

Prompt

Given a time in -hour AM/PM format, convert it to military (24-hour) time.

Sample Input

07:05:45PM

Sample Output

19:05:45

Solution

'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 'timeConversion' function below.
 *
 * The function is expected to return a STRING.
 * The function accepts STRING s as parameter.
 */

function timeConversion(s) {
    const isAM = s.includes("AM");
    const removeAMPM = s.replace("AM", "").replace("PM","");
    const splitColumn = removeAMPM.split(":");
    const hour = splitColumn[0]
    let timeWithoutHour = "";
    
    splitColumn.forEach((each, eachIndex) => {
       if (eachIndex == 0){
           
       } else {
           timeWithoutHour = timeWithoutHour + ":" + each;
       }
    });
    let output = "";
    
    if (isAM){
        if (hour.length == 1){
        
        output = "0"+removeAMPM;
    } else if (hour == "12"){
        output = "00"+timeWithoutHour;
    } else {
        output = removeAMPM;
    }
    }
    
    
    if…