how to convert string into time format and add two hours [duplicate]

Question

I have the following requirement in the project.

I have a input field by name startDate and user enters in the format YYYY-MM-DD HH:MM:SS. I need to add two hours for the user input in the startDate field. how can i do it.

Thanks in advance

Answer 1

You can use SimpleDateFormat to convert the String to Date. And after that you have two options,

• Make a Calendar object and and then use that to add two hours, or

• get the time in millisecond from that date object, and add two hours like, (2 * 60 * 60 * 1000)

  SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  // replace with your start date string Date d = df.parse("2008-04-16 00:05:05");  Calendar gc = new GregorianCalendar(); gc.setTime(d); gc.add(Calendar.HOUR, 2); Date d2 = gc.getTime(); 

  Or,

  SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  // replace with your start date string Date d = df.parse("2008-04-16 00:05:05"); Long time = d.getTime(); time +=(2*60*60*1000); Date d2 = new Date(time); 

Have a look to these tutorials.

• SimpleDateFormat Tutorial
• Calendar Tutorial

Answer 2

Being a fan of the Joda Time library, here's how you can do it that way using a Joda DateTime:

import org.joda.time.format.*; import org.joda.time.*;  ...      String dateString = "2009-04-17 10:41:33";  // parse the string DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss"); DateTime dateTime = formatter.parseDateTime(dateString);  // add two hours dateTime = dateTime.plusHours(2); // easier than mucking about with Calendar and constants  System.out.println(dateTime); 

If you still need to use java.util.Date objects before/after this conversion, the Joda DateTime API provides some easy toDate() and toCalendar() methods for easy translation.

The Joda API provides so much more in the way of convenience over the Java Date/Calendar API.