public Instant plusSeconds(long secondsToAdd)

// Java program to demonstrate
// Instant.plusSeconds() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a Instant object
        Instant instant
            = Instant.parse("2018-10-28T19:34:50.63Z");
  
        // print Instant
        System.out.println("Instant: "
                           + instant);
  
        // addition of 84000 seconds to this instant
        Instant returnedValue
            = instant.plusSeconds(84000);
  
        // print result
        System.out.println("Returned Instant: "
                           + returnedValue);
    }
}

Instant: 2018-10-28T19:34:50.630Z
Returned Instant: 2018-10-29T18:54:50.630Z

// Java program to demonstrate
// Instant.plusSeconds() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a Instant object
        Instant instant = Instant.now();
  
        // current Instant
        System.out.println("Current instant: "
                           + instant);
  
        // addition of 930000 seconds
        // to this instant
        Instant returnedValue
            = instant.plusSeconds(930000);
  
        // print result
        System.out.println("Returned Instant: "
                           + returnedValue);
    }
}

Current instant: 2018-11-28T05:39:46.572Z
Returned Instant: 2018-12-08T23:59:46.572Z