A Java Program to get current timestamp using using the java.time.Instant Check the blog at https://coderolls.com/how-to-get-current-timestamps-in-java/

InstantExample.java

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

/**
 * A Java Program to get current timestamp using using the java.time.Instant
 * 
 * @author Gaurav Kukade at coderolls.com
 *
 */
public class InstantExample {
	
	public static void main(String[] args) {
	    
	    Instant instant = Instant.now();
	    System.out.println("1. instant: "+ instant);    // 2021-05-13T15:05:18.734Z
	    

	    //convert date object to instant
	    Date date = new Date();
	    Instant instantFromDate = date.toInstant();
	    
	    System.out.println("2. instantFromDate: " +instantFromDate);  // 2021-05-13T15:05:18.873Z
	    
	    
	    //get instnat from the java.sql.Timestamp
	    Timestamp timestamp = new Timestamp(System.currentTimeMillis());
	    Instant instantFromTimestamp = timestamp.toInstant();
	    
	    System.out.println("3. instantFromTimestamp: "+ instantFromTimestamp);  // 2021-05-13T15:05:18.874Z 
	    
	    //get the epoch timestamp in milliseconds 
	    //epoch timestamp is number of milliseconds since January 1, 1970, 00:00:00 GMT
	    Instant instant2 = Instant.now();  
	    long timeStampMillis = instant2.toEpochMilli();
	    
	    System.out.println("4. timeStampMillis: "+ timeStampMillis);   // 1620918318874
	    
	    //get the epoch timestamp in seconds
	    Instant instant3 = Instant.now();
	    long timeStampSeconds = instant3.getEpochSecond();
	    
	    System.out.println("5. timeStampSeconds: "+ timeStampSeconds);   // 1620918318

	}

}