diff --git a/s-day01/src/com/inmind/jdk8_date05/DurationDemo14.java b/s-day01/src/com/inmind/jdk8_date05/DurationDemo14.java
new file mode 100644
index 0000000..fcbd7a4
--- /dev/null
+++ b/s-day01/src/com/inmind/jdk8_date05/DurationDemo14.java
@@ -0,0 +1,26 @@
+package com.inmind.jdk8_date05;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+
+/*
+Duration类。它是用来表示两个时间对象的时间间隔
+可以用于计算两个时间对象相差的天数、小时数、分数、秒数、纳秒数；支持LocalTime、LocalDateTime、Instant等时间
+*/
+public class DurationDemo14 {
+    public static void main(String[] args) {
+        //1.创建两个时间对象（带时分秒）
+        LocalDateTime start = LocalDateTime.of(2025, 3, 16, 15, 43, 44);
+        LocalDateTime end = LocalDateTime.of(2026, 7, 30, 11, 50, 44);
+
+        //2.获取时间间隔对象
+        Duration duration = Duration.between(start, end);
+        //3.获取时间间隔的信息
+        System.out.println(duration.toDays());
+        System.out.println(duration.toHours());
+        System.out.println(duration.toMinutes());
+        System.out.println(duration.toSeconds());
+        System.out.println(duration.toMillis());
+        System.out.println(duration.toNanos());
+    }
+}
diff --git a/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java b/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java
index 86eed9c..e46a6b5 100644
--- a/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java
+++ b/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java
@@ -1,5 +1,6 @@
 package com.inmind.jdk8_date05;
 
+import java.time.Duration;
 import java.time.Instant;
 
 /**
@@ -29,9 +30,14 @@ public class InstantDemo12 {
 
         // Instant对象的作用：做代码的性能分析，或者记录用户的操作时间点
         Instant start = Instant.now();
+        for (int i = 0; i < 500; i++) {
+            System.out.println("---------");
+        }
         //代码的执行（50行代码的功能）
         Instant end = Instant.now();
-        //todo 之后我们会用间隔来计算时间差！！！
+        //我们会用间隔来计算时间差！！！
+        Duration duration = Duration.between(start, end);
+        System.out.println(duration.toNanos());
         //传统的Date类，只能精确到毫秒，并且是可变对象，而Instant可以精确到纳秒，并且不可改变对象，推荐使用Instant，但一般LocalDateTime也够用了
     }
 }