AtomicReferenceTest

import java.util.concurrent.atomic.AtomicReference;

public class Test {
  private static AtomicReference<Long> currentTime = new AtomicReference<>(1587625373400L);

  public static void main(String[] args) {

    System.out.println(currentTime); // 1587625373400L
    System.out.println(
        currentTime.accumulateAndGet(
            1587625373499L, (prev, next) -> next > prev ? next : prev + 1)); // 1587625373499L
    System.out.println(currentTime); // 1587625373499L
    System.out.println(
        currentTime.accumulateAndGet(
            1587625373499L, (prev, next) -> next > prev ? next : prev + 1)); // 1587625373500L
  }
}