How Do Java Convert Date to Timestamp?

In Java, you can convert a Date to a Timestamp by creating a Timestamp object that represents the same time as the Date. The Timestamp class is a subclass of java.util.Date and provides nanosecond precision, unlike the Date class which only provides millisecond precision.

Here’s how you can do it:

Code Example:

import java.util.Date;
import java.sql.Timestamp;

public class DateToTimestamp {
    public static void main(String[] args) {
        // Create a Date object
        Date date = new Date();

        // Convert Date to Timestamp
        Timestamp timestamp = new Timestamp(date.getTime());

        // Print both Date and Timestamp
        System.out.println("Date: " + date);
        System.out.println("Timestamp: " + timestamp);
    }
}

Explanation:

1. new Date() creates a Date object representing the current time.
2. date.getTime() gets the time in milliseconds (from the Unix epoch) from the Date object.
3. new Timestamp(long time) creates a Timestamp object using the milliseconds returned by getTime().

Output:

If you run the code, the output will look something like this (depending on the current date and time):

Date: Sun Jan 20 15:30:45 GMT 2025
Timestamp: 2025-01-20 15:30:45.123

The Timestamp has nanosecond precision (though you may not see the nanoseconds if they are zero in this case).