Java convert AM/PM to 24 hour

/**
 * @author lautturi.com
 * Java example: conversion from 12 hours time to 24 hours time in java
 */

import java.util.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public class Lautturi {

	public static void main(String[] args) throws ParseException {

		String timeStr = "03:30 PM";

		String result = LocalTime.parse(timeStr, DateTimeFormatter.ofPattern("hh:mm a", Locale.US))
				.format(DateTimeFormatter.ofPattern("HH:mm"));
		System.out.println(timeStr + " = " + result);

	}
}