How to convert String to 24 hour date time format in java

We already discussed String to Date conversion. In this tutorial we will see how to convert a String into a 24 hour date time format in Java.

Complete example:
Here we are having three Strings of different format and we are converting them into a 24 hour format date time. If your date format is different than the mentioned ones then you can easily replace the pattern in the below example with the pattern of your input String. Refer this javadoc to specify the input and output date/time pattern.

import java.text.SimpleDateFormat;
import java.text.DateFormat;
import java.util.Date;
import java.text.ParseException;
class ConvertStringDateDemo
{
    public static void main(String[] args)
    {	
    	String string = "Jan 07, 2014 9:15:12 PM";
    	DateFormat inFormat = new SimpleDateFormat( "MMM dd, yyyy hh:mm:ss aa");

    	String string2 = "2014-12-27 19:10:22";
    	DateFormat inFormat2 = new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss");

    	String string3 = "12-09-2014 01:10 PM";
    	DateFormat inFormat3 = new SimpleDateFormat( "dd-MM-yyyy hh:mm aa");

    	DateFormat outFormat = new SimpleDateFormat( "yyyy/MM/dd HH:mm:ss");
    	Date date = null;
    	Date date2 = null;
    	Date date3 = null;
    	try
    	{
    	    date = inFormat.parse(string);
    	    date2 = inFormat2.parse(string2);
    	    date3 = inFormat3.parse(string3);
    	}
    	catch ( ParseException e )
    	{
    	        e.printStackTrace();
    	}
    	if( date != null )
    	{
    	    String myDate = outFormat.format(date);
    	    String myDate2 = outFormat.format(date2);
    	    String myDate3 = outFormat.format(date3);
    	    System.out.println(myDate);
    	    System.out.println(myDate2);
    	    System.out.println(myDate3);
    	}
    }
}

Output:

2014/01/07 21:15:12
2014/12/27 19:10:22
2014/09/12 13:10:00