java.time.OffsetDateTime.plus(TemporalAmount amountToAdd)

package com.codingdict;

import java.time.OffsetDateTime;
import java.time.Period;

public class OffsetDateTimeDemo {
   public static void main(String[] args) {

      OffsetDateTime date = OffsetDateTime.parse("2017-02-03T10:15:30+01:00");
      OffsetDateTime date1 = date.plus(Period.ofDays(10));
      System.out.println(date1);  
   }
}