edit DemoApplication.java

src/main/java/com/example/demo/DemoApplication.java

@@ -7,6 +7,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 public class DemoApplication {
 
 	public static void main(String[] args) {
+		System.out.println(new Date());
 		System.out.println("Start application");
 		SpringApplication.run(DemoApplication.class, args);
 	}