# Convert Time From 12 Hour To 24 Hour Format ## Write a program to convert time from 12-hour to 24-hour format ```txt Input : 12:05:45PM Output : 12:05:45 ``` --- ```c // 12 to 24 hours conversion.. // by: Kundan Kumar #include #include int main() { int hour, minute, ss; char a[3]; printf("Enter hours : \t"); scanf("%d", &hour); printf("Enter minutes : \t"); scanf("%d", &minute); printf("Enter seconds : \t"); scanf("%d", &ss); printf("Enter am (for morning) and pm (for evening):\t"); scanf("%s", &a); /* * user is allowed to enter time only in 12-hour format * so that 'hh' cannot be greater than 12. */ if(hour <= 12 && minute <= 59 && ss <= 59) { if((strcmp(a,"PM") == 0) || (strcmp(a,"pm") == 0) && (hour != 0) && (hour != 12)) { hour = hour + 12; } if((strcmp(a,"AM") == 0) || (strcmp(a,"am") == 0) && (hour == 12)) { hour = 0; } printf("The obtained 24-hour format of input is : \t"); printf("%02d:%02d:%02d", hour, minute, ss); printf("\n\n"); } else { printf("Provide the correct inputs."); } return 0; } ``` ```cpp // C++ program to convert 12 hour to 24 hour // format #include 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 (hh > 12){ cout << "Are you sure that the time is in 12-hour format \n"; } else { // 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]; } } } } int main() { string str = "13:05:45PM"; print24(str); return 0; } ``` ```csharp using System; namespace Demo { public class Program { public static void Main(string[] args) { DateTime d = DateTime.Parse("12:05:45 PM"); Console.WriteLine(d.ToString("HH:mm")); } } } ``` ```java import java.util.Scanner; import java.text.SimpleDateFormat; import java.util.Date; public class convert_time_from_12_hour_to_24_hour_format { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.print("Enter hours:(hh:mm:ssaa) "); String input = sc.next(); String[] time = input.split(":"); sc.close(); String twelveHoursTime = ""; try { switch(time.length) { case 1: twelveHoursTime = time[0].substring(0, time[0].length()-2)+":00:00"+time[0].substring(time[0].length()-2, time[0].length()); break; case 2: twelveHoursTime = time[0]+":"+time[1].substring(0, time[1].length()-2)+":00"+time[1].substring(time[1].length()-2, time[1].length()); break; default: twelveHoursTime = input; break; } SimpleDateFormat df = new SimpleDateFormat("hh:mm:ssaa"); Date date = df.parse(twelveHoursTime); System.out.println("Output : " + new SimpleDateFormat("HH:mm:ss").format(date)); } catch (Exception e) { e.printStackTrace(); } } } ``` ```javascript function convertTimeTo24Hours(time) { let splitDate = time.split(":"); let parsedDate = parseInt(splitDate[0]); let ampm = splitDate[2].replace(/[^a-zA-Z]+/g, ""); let convertedDate = 0; if (ampm === "PM") { if (parsedDate == 12) { convertedDate = 12; } if (parsedDate < 12) { convertedDate = parsedDate + 12; } } if (ampm === "AM") { if (parsedDate == 12) { convertedDate = 0; } else { convertedDate = parsedDate; } } console.log(convertedDate + `:${splitDate[1]}:${splitDate[2]}`); } convertTimeTo24Hours("12:05:45AM"); ``` ```ruby def convertTimeTo24Hours(string) splitTime = string.split(":") ampm = splitTime.last.gsub(/[^a-zA-Z]/, "") hour = splitTime.first.to_i ampm == "PM" ? if hour == 12 newHour = hour elsif hour < 12 newHour = hour + 12 end : if (hour == 12) newHour = 0 else newHour = hour end newHour.to_s + ":#{splitTime[1]}" + ":#{splitTime[2].gsub(/[^0-9]/, "")}" end puts convertTimeTo24Hours("12:05:45PM") ``` ```typescript function convertTimeTo24Hours(time: string) { const splitDate = time.split(":"); const parsedDate = parseInt(splitDate[0]); const ampm = splitDate[2].replace(/[^a-zA-Z]+/g, ""); let convertedDate = 0; if (ampm === "PM") { if (parsedDate == 12) { convertedDate = 12; } if (parsedDate < 12) { convertedDate = parsedDate + 12; } } if (ampm === "AM") { if (parsedDate == 12) { convertedDate = 0; } else { convertedDate = parsedDate; } } console.log(convertedDate + `:${splitDate[1]}:${splitDate[2]}`); } convertTimeTo24Hours("12:05:45AM"); ``` ```go package main import ( "fmt" "strings" ) func convertTimeTo24HourFormat(time12 string) string { hour := time12[:2] period := strings.ToUpper(time12[len(time12)-2:]) time := time12[:len(time12)-2] if period == "PM" && hour != "12" { hourInt := int(hour[0]-'0')*10 + int(hour[1]-'0') + 12 hour = fmt.Sprintf("%02d", hourInt) } else if period == "AM" && hour == "12" { hour = "00" } return hour + time[2:] } func main() { var time12 string fmt.Print("Input : ") fmt.Scanln(&time12) time24 := convertTimeTo24HourFormat(time12) fmt.Println("Output :", time24) } ``` ```php

Convert Time From 12 Hour To 24 Hour Format

Write a program to convert time from 12-hour to 24-hour format

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