Given a time at 12-hour AM/PM format, convert it to military (24-hour) time.
Note: Midnight is 12:00:00 AM on a 12-hour clock and 00:00:00 on a 24-hour clock. Noon is 12:00:00 PM on 12-hour clock and 12:00:00 on 24-hour clock
Examples:
Input : A single string containing a time in 12-hour
clock format(hh:mm:ss AM or hh:mm:ss PM
where 01 <= hh <= 12 or 01 <= mm,ss <= 59
Output :Convert and print the given time in 24-hour format,
where 00 <= hh <= 23
Input : 07:05:45PM
Output : 19:05:45
C++
// C++ program to convert 12 hour to 24 hour// format#include<iostream>using namespace std;void print24(string str){ // Get hours int h1 = (int)str[1] - '0'; int h2 = (int)str[0] - '0'; int hh = (h2 * 10 + h1 % 10); // If time is in "AM" if (str[8] == 'A') { if (hh == 12) { cout << "00"; for (int i=2; i <= 7; i++) cout << str[i]; } else { for (int i=0; i <= 7; i++) cout << str[i]; } } // If time is in "PM" else { if (hh == 12) { cout << "12"; for (int i=2; i <= 7; i++) cout << str[i]; } else { hh = hh + 12; cout << hh; for (int i=2; i <= 7; i++) cout << str[i]; } }}// Driver codeint main(){ string str = "07:05:45PM"; print24(str); return 0;} |
Java
// Java program to convert 12 hour // format to 24 hour formatimport java.io.*;public class GFG{static void print24(String str){ // Get hours int h1 = (int)str.charAt(1) - '0'; int h2 = (int)str.charAt(0) - '0'; int hh = (h2 * 10 + h1 % 10); // If time is in "AM" if (str.charAt(8) == 'A') { if (hh == 12) { System.out.print("00"); for (int i = 2; i <= 7; i++) System.out.print(str.charAt(i)); } else { for (int i = 0; i <= 7; i++) System.out.print(str.charAt(i)); } } // If time is in "PM" else { if (hh == 12) { System.out.print("12"); for (int i = 2; i <= 7; i++) System.out.print(str.charAt(i)); } else { hh = hh + 12; System.out.print(hh); for (int i = 2; i <= 7; i++) System.out.print(str.charAt(i)); } }} // Driver code public static void main (String[] args){ String str = "07:05:45PM"; print24(str);}}// This code is contributed by Anant Agarwal. |
Python3
# Python3 program to convert 12# hour to 24 hour formatdef print24(s): # Get hours h1 = ord(s[1]) - ord('0') h2 = ord(s[0]) - ord('0') hh = (h2 * 10 + h1 % 10) # If time is in "AM" if (s[8] == 'A'): if (hh == 12): print('00', end = '') for i in range(2, 8): print(s[i], end = '') else: for i in range(0, 8): print(s[i], end = '') # If time is in "PM" else: if (hh == 12): print("12", end = '') for i in range(2, 8): print(s[i], end = '') else: hh = hh + 12; print(hh, end = '') for i in range(2, 8): print(s[i], end = '') # Driver code if __name__=="__main__": s = "07:05:45PM" print24(s) # This code is contributed by rutvik_56 |
C#
// C# program to convert 12 hour // format to 24 hour formatusing System;class GFG{ static void print24(String str){ // Get hours int h1 = (int)str[1] - '0'; int h2 = (int)str[0] - '0'; int hh = (h2 * 10 + h1 % 10); // If time is in "AM" if (str[8] == 'A') { if (hh == 12) { Console.Write("00"); for (int i = 2; i <= 7; i++) Console.Write(str[i]); } else { for (int i = 0; i <= 7; i++) Console.Write(str[i]); } } // If time is in "PM" else { if (hh == 12) { Console.Write("12"); for (int i = 2; i <= 7; i++) Console.Write(str[i]); } else { hh = hh + 12; Console.Write(hh); for (int i = 2; i <= 7; i++) Console.Write(str[i]); } }} // Driver code public static void Main(String[] args){ String str = "07:05:45PM"; print24(str);}}// This code is contributed by Rajput-Ji |
Javascript
<script>// javascript program to convert 12 hour// format to 24 hour format function print24(str){ // Get hours var h1 = Number(str[1] - '0'); var h2 = Number(str[0] - '0'); var hh = (h2 * 10 + h1 % 10); // If time is in "AM" if (str[8] == 'A') { if (hh == 12) { document.write("00"); for (var i = 2; i <= 7; i++) document.write(str[i]); } else { for (var i = 0; i <= 7; i++) document.write(str[i]); } } // If time is in "PM" else { if (hh == 12) { document.write("12"); for (var i = 2; i <= 7; i++) document.write(str[i]); } else { hh = hh + 12; document.write(hh); for (var i = 2; i <= 7; i++) document.write(str[i]); } }} // Driver code var str = "07:05:45PM"; print24(str);// This code is contributed by bunnyram19.</script> |
Output
19:05:45
Time Complexity: O(1)
Auxiliary Space: O(1)
Method 2: Using java Date
C++
#include <iostream>#include <ctime>using namespace std;string englishTime(string input) { // Format of the date defined in the input String struct tm tm; strptime(input.c_str(), "%I:%M:%S %p", &tm); // Changing the format of date and storing it in string char output[9]; strftime(output, sizeof(output), "%H:%M:%S", &tm); return string(output);}// Driver codeint main() { cout << englishTime("07:05:45 PM") << endl; return 0;} |
Java
// Java program for the above approachimport java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class GFG { public static String englishTime(String input) throws ParseException { // Format of the date defined in the input String DateFormat dateFormat = new SimpleDateFormat("hh:mm:ss aa"); // Change the pattern into 24 hour format DateFormat format = new SimpleDateFormat("HH:mm:ss"); Date time = null; String output = ""; // Converting the input String to Date time = dateFormat.parse(input); // Changing the format of date // and storing it in // String output = format.format(time); return output; } // Driver Code public static void main(String[] arg) throws ParseException { System.out.println(englishTime("07:05:45 PM")); }} |
Python3
# Python program for the above approachimport datetimedef englishTime(input): # Format of the date defined in the input String dateFormat = datetime.datetime.strptime(input, "%I:%M:%S %p") # Change the pattern into 24 hour format format = datetime.datetime.strftime(dateFormat, "%H:%M:%S") return format# Driver Codeprint(englishTime("07:05:45 PM")) |
C#
using System;using System.Globalization;class GFG { public static string englishTime(string input) { // Format of the date defined in the input String DateTime time; CultureInfo provider = CultureInfo.InvariantCulture; DateTime.TryParseExact(input, "hh:mm:ss tt", provider, DateTimeStyles.None, out time); // Change the pattern into 24 hour format DateTimeFormatInfo dtfi = CultureInfo.InvariantCulture.DateTimeFormat; string output = time.ToString("HH:mm:ss", dtfi); return output; } // Driver Code static void Main(string[] args) { Console.WriteLine(englishTime("07:05:45 PM")); }} |
Javascript
// Function to convert 12 hour time format to 24 hour time formatfunction englishTime(input) { // Create a Date object with the input time string let date = new Date("1970-01-01 " + input); // Format the date object into a 24 hour time string let format = date.toLocaleTimeString([], { hour12: false }); return format;}// Driver Codeconsole.log(englishTime("07:05:45 PM")); |
Output
19:05:45
Time Complexity: O(1)
Auxiliary Space: O(1)
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