introduction to Date classes in java

1. Java.util packages

2. Date
● The java.util.Date class represents a specific
instant in time, with millisecond precision.
● Most of the methods in the class are
deprecated in favor of the java.util.Calendar
class.
● Date d = new Date();

3. Constructors in java
Constructor Description
Date() This constructor allocates a date object
and initializes it so that it represents the
time at which was allocated, measured to
the nearest milliseconds
Date(long date) This constructor allocates a Date object
and initializes it to represent the specified
number of milliseconds since the
standard base time known as “the epoch”,
namely january 1,1940, 00:00:00 GMT

4. Methods in Date class
Method Description
Boolean after(Date when) This method tests if this date is after the
specified date
Boolean before(Date when) This method tests if this date is before the
specified date
Object clone() This method return a copy of this object.
Int compareTo(date anotherDate) This method compares two dates for
ordering
Boolean equals(object obj) This method compares two dates for
equality
Long getTime() This method returns the number of
milliseconds since january 1, 1970,
00:00:00 GMT represneted by this Date
object.
Int hasCode() This method returns a hash code value
for this object
Void setTime(long time) This method sets this Date object to
represent a point in time that is time
milliseconds after january 1, 1970

5. Cont'd
Methods Description
String toString() This method converts this Date object to
string of the form

6. Date format codes

7. Sample code for Date
package day5;
import java.util.Date;
public class DateClass
{
public static void main(String[] args)
{
Date d = new Date();
System.out.println(d);
}
}
Output :
Tue Jul 01 11:30:18 IST 2014

8. Code for comparing dates

9. Sample output

10. Parsing string to date

11. Sample output

12. Any queries?

13. Thank you