Convert timestamp string to long in java

Question

I have to fetch time stamp from DB and retrieve only time and compare two time.

//below are the string values

 String st1 = "2015-07-24T09:39:14.000Z";      
 String st2 = "2015-07-24T09:45:44.000Z";

//retrieving only time 09:39:14

 String s = st1.substring(st1.indexOf("T") + 1, st1.indexOf(".0"));

//string to Long.

 Long time = Long.parseLong(s);

 Long tim1=Long.valueOf(s).longValue();

Error:

java.lang.NumberFormatException.forInputString(Unknown Source)
    at java.lang.Long.parseLong(Unknown Source)
    at java.lang.Long.parseLong(Unknown Source)

Answer 1

Another option is by using SimpleDateFormat (May not be the best compare to JODA Time)

public static void main(String[] args) throws ParseException {
        String st1 = "2015-07-24T09:39:14.000Z";
        String st2 = "2015-07-24T09:45:44.000Z";

        String time1 = st1.substring(st1.indexOf("T") + 1, st1.indexOf(".0"));
        String time2 = st2.substring(st2.indexOf("T") + 1, st2.indexOf(".0"));

        Date dateTime1 = new java.text.SimpleDateFormat("HH:mm").parse(time1);
        Date dateTime2 = new java.text.SimpleDateFormat("HH:mm").parse(time2);

        System.out.println(dateTime1.after(dateTime2));

    }