[2019.01.25] Time Conversion

Problem

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

Note: Midnight is 12:00:00AM on a 12-hour clock, and 00:00:00 on a 24-hour clock. Noon is 12:00:00PM on a 12-hour clock, and 12:00:00 on a 24-hour clock.

Function Description

Complete the timeConversion function in the editor below. It should return a new string representing the input time in 24 hour format.

timeConversion has the following parameter(s):

• s: a string representing time in  hour format

Input Format

A single string  containing a time in -hour clock format (i.e.:  or ), where  and .

Constraints

• All input times are valid

Output Format

Convert and print the given time in -hour format, where .

Sample Input 0

07:05:45PM

Sample Output 0

19:05:45

How I solved the problem

# AM일때와 PM일 때를 나눠서 로직이 짜여야함

# AM일 경우 12:00:00AM을 00:00:00으로 바꿀 수 있도록 체크해야함. 나머지는 그냥 그대로 나오면 됨.

# PM일 경우 12:00:00PM을 제외하고 나머지 시간은 12시간을 더해줘야함.

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import java.io.*; import java.math.*; import java.text.*; import java.util.*; import java.util.regex.*;   public class Solution {       /*      * Complete the timeConversion function below.      */     static String timeConversion(String s) {         /*          * Write your code here.          */            //AM          if (s.indexOf("AM") != -1) {              s = s.substring(0, s.indexOf("AM"));              String[] amSplit = s.split(":");                           //12:00AM ~ 11:59AM              int hour = Integer.parseInt(amSplit[0]);                            if (hour == 12) {                  return "00:" + amSplit[1] + ":" + amSplit[2];              }                            return s;          }            //PM //12:00 PM ~ 11:59PM          s = s.substring(0, s.indexOf("PM"));          String[] timeSplit = s.split(":");          //hour check          int hour = Integer.parseInt(timeSplit[0]);            if (hour != 12) {             hour = hour + 12;          }                    String militaryTime = hour + ":" + timeSplit[1] + ":" + timeSplit[2];          return militaryTime;     }       private static final Scanner scan = new Scanner(System.in);       public static void main(String[] args) throws IOException {         BufferedWriter bw = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));           String s = scan.nextLine();           String result = timeConversion(s);           bw.write(result);         bw.newLine();           bw.close();     } }   Colored by Color Scripter

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