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Log4j – Logging framework in JavaInterview Questions in JavaIn this post, you will learn how to handle date and time in Java. 3 important classes to work with Date and time in Java are
- Date – Legacy date class.
- Calendar – calculating the difference between dates, adding, deleting duration from dates.
- SimpleDateFormat – formatting dates.
package datetime;
import java.text.*;
import java.util.*;
public class DateTime {
public static void main(String[] args) throws Exception{
//SimpleDateFormat can be used to specify the format of date
//example - yyyy/MM/dd HH:mm:ss, MM/dd/yyyy
DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
Calendar cal = Calendar.getInstance();
System.out.println("Todays date -> "
+ dateFormat.format(cal.getTime()));
//get future date by adding 15 days to current date
cal.add(Calendar.DATE, 15);
System.out.println("15 Days from today -> "
+ dateFormat.format(cal.getTime()));
//get past date by subtracting 25 days from it.
cal.add(Calendar.DATE, -25);
System.out.println("25 days in the past -> "
+ dateFormat.format(cal.getTime()));
//For comparing dates, use Date class
Date date1 = dateFormat.parse("11-12-2020");
Date date2 = dateFormat.parse("11-12-2016");
Date date3 = new Date();
System.out.println("date 1 -> " + dateFormat.format(date1));
System.out.println("date 2 -> " + dateFormat.format(date2));
System.out.println("date 3 -> " + dateFormat.format(date3));
if (date1.before(date2))
System.out.println("Date1 falls before Date2");
if (date1.after(date3))
System.out.println("Date1 falls after Date3");
if (date1.equals(date2))
System.out.println("Date1 and Date2 fall on same day");
}
}
Here is the output of above example.
Todays date -> 16-04-2016
15 Days from today -> 01-05-2016
25 days in the past -> 06-04-2016
date 1 -> 11-12-2020
date 2 -> 11-12-2016
date 3 -> 16-04-2016
Date1 falls after Date3
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