public Instant minusNanos(long nanosToSubtract)

// Java program to demonstrate
// Instant.minusNanos() method
 
import java.time.*;
 
public class GFG {
    public static void main(String[] args)
    {
 
        // create a Instant object
        Instant instant
            = Instant.parse("2018-12-30T19:34:50.63Z");
 
        // current Instant
        System.out.println("Initialize instant: "
                           + instant);
 
        // subtract 430000000 nanoseconds
        // means .43 seconds from this instant
        Instant returnedValue
            = instant.minusNanos(430000000);
 
        // print result
        System.out.println("Returned Instant: "
                           + returnedValue);
    }
}

Initialize instant: 2018-12-30T19:34:50.630Z
Returned Instant: 2018-12-30T19:34:50.200Z

// Java program to demonstrate
// Instant.minusNanos() 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);
 
        // subtract 540000000 nanoseconds
        // means .564 seconds from this instant
        Instant returnedValue
            = instant.minusNanos(540000000);
 
        // print result
        System.out.println("Returned Instant: "
                           + returnedValue);
    }
}

Current instant: 2018-11-27T06:43:58.495Z
Returned Instant: 2018-11-27T06:43:57.955Z