HackerRank Js-Week1 3. Time Conversion

    AllenLi
    HackerRank

    Given a time in 12-hour AM/PM format, convert it to military (24-hour) time.

    Note: – 12:00:00AM on a 12-hour clock is 00:00:00 on a 24-hour clock.
    – 12:00:00PM on a 12-hour clock is 12:00:00 on a 24-hour clock.

    給與一個 12 小時制 AM/PM 格式的時間，將其轉換為軍用（24 小時制）時間。

    Example 1:

    s = '12:01:00PM'
Return '12:01:00'.

    Example 2:

    s = '12:01:00AM'
Return '00:01:00'.

    solution:
    先了解 AM 與 PM 的時間轉換格式，將 PM 的部分進行分類後，額外增加 12，(’12:00:00′ 轉換成 ’24:00:00’。)
    再將 AM 的 ’12:00:00′ 轉換成 ’00:00:00’。

    Code 1: BigO(n log n)

    '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) {
    // Write your code here
    let checkAmPm = s.charAt(8),
        militaryTime = s.substring(0, 2)
  
    if (checkAmPm === "P" && militaryTime !== "12") {
        militaryTime = String(parseInt(militaryTime, 10) + 12);
    } else if (checkAmPm === "A" && militaryTime === "12") {
        militaryTime = "00";
    }
    
    return militaryTime + s.substring(2, 8);
}

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

    const s = readLine();

    const result = timeConversion(s);

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

    ws.end();
}

    FlowChart:
    Example 1

    s = '12:01:00PM'

checkAmPm = 'P'
'12:01:00PM' => '12:01:00'

    Example 2

    s = '12:01:00AM'


checkAmPm = 'A'
'12:01:00AM' => '00:01:00'

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