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  1. Prepare
  2. Algorithms
  3. Warmup
  4. Time Conversion
  5. Discussions

Time Conversion

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5166 Discussions

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  • serenitydiver
     + 0 comments

    Java 8 based with 2 different approaches 

        // Using Java LocalTime class.
    private static String timeConverterLocalTime(String input) {
        DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("hh:mm:ssa");
        DateTimeFormatter outputFormat = DateTimeFormatter.ofPattern("HH:mm:ss");
        LocalTime timeIn24 = LocalTime.parse(input, timeFormatter);
        return timeIn24.format(outputFormat);
    }

    // Using Java algorithmic approach.
    private static String timeConverter(String input) {
        String timeIn24 = "";
        String hours = input.substring(0, 2);
        String timeWithoutPrefix = input.substring(0, input.length() - 2);

        if (input.contains("PM")) {
            if (hours.equals("12")) {
                timeIn24 = timeWithoutPrefix;
            } else {
                int hourIn24 = Integer.parseInt(hours) + 12;
                timeIn24 = String.valueOf(hourIn24).concat(timeWithoutPrefix.substring(2));
            }
        }

        if (input.contains("AM")) {
            if (hours.equals("12")) {
                timeIn24 = "00".concat(timeWithoutPrefix.substring(2));
            } else {
                timeIn24 = timeWithoutPrefix;
            }
        }
        return timeIn24;
    }

  • yefrosynii
     + 0 comments
    function timeConversion(s: string): string {
    const ampm = s.substring(s.length -2, s.length).toUpperCase() as "AM" | "PM";
    let hour: number = parseInt(s.substring(0, 2));
    
    if (Number.isNaN(hour)) throw new Error("Hour is NaN");
    
    if (ampm === "AM" && hour === 12) {
        hour = 0;
    } else if (ampm === "PM" && hour < 12) {
        hour += 12;
    }
    
    return `${String(hour).padStart(2, "0")}${s.substring(2, s.length - 2)}`;
}

  • mreshmika4
     + 0 comments

    Java:

    public static String timeConversion(String s) {
    if (s.substring(s.length()-2, s.length()).equals("AM") && s.substring(0, 2).equals("12")){
        return "00"+s.substring(2, s.length() - 2);
    }
    else if(s.substring(s.length()-2, s.length()).equals("AM")||s.substring(0, 2).equals("12")){
        return s.substring(0, s.length() - 2);
    }
    else {
        String time = (Integer.parseInt(s.substring(0, 2))+12)+s.substring(2, s.length() - 2);
        return time;
    }
// Write your code here

}

  • fahadtuhin2
     + 0 comments

    string timeConversion(string s) { string hour = s.substr(0, 2); // starts from 0 and len = 2 string amPM = s.substr(8); // from 0 to the rest

    string result = "";
if (hour == "12") {
    result += (amPM == "PM") ? "12" : "00";
} else {
    result += (amPM == "PM") ? to_string(stoi(hour) + 12) : hour;
}

result += s.substr(2, 6); // starts from the index 2 and len = 6
return result;

    }

  • pkrbodade95
     + 0 comments

    Java 15

    int hour = Integer.parseInt(s.substring(0, 2));
     if (s.charAt(8) == 'P') {
         if (hour != 12)
             hour = (hour + 12) % 24;
     } else if (hour == 12)
         hour = (hour + 12) % 24;

     String hr = Integer.toString(hour);
     if (hr.length() == 1)
         hr = "0".concat(hr);

     return hr.concat(s.substring(2, 8));