diff --git a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
index 3eecb55c7..6fd4c4230 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
@@ -1813,7 +1813,7 @@ public class DateUtil extends CalendarUtil {
 
 	/**
 	 * HH:mm:ss 时间格式字符串转为秒数<br>
-	 * 参考：https://github.com/iceroot
+	 * 参考：<a href="https://github.com/iceroot">https://github.com/iceroot</a>
 	 *
 	 * @param timeStr 字符串时分秒(HH:mm:ss)格式
 	 * @return 时分秒转换后的秒数
@@ -1836,7 +1836,7 @@ public class DateUtil extends CalendarUtil {
 
 	/**
 	 * 秒数转为时间格式(HH:mm:ss)<br>
-	 * 参考：https://github.com/iceroot
+	 * 参考：<a href="https://github.com/iceroot">https://github.com/iceroot</a>
 	 *
 	 * @param seconds 需要转换的秒数
 	 * @return 转换后的字符串
diff --git a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
index b9de72b6f..7874b5cd9 100644
--- a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
@@ -1029,6 +1029,7 @@ public class DateUtilTest {
 	}
 
 	@Test
+	@SuppressWarnings("ConstantConditions")
 	public void isOverlapTest() {
 		DateTime oneStartTime = DateUtil.parse("2022-01-01 10:10:10");
 		DateTime oneEndTime = DateUtil.parse("2022-01-01 11:10:10");
@@ -1055,6 +1056,16 @@ public class DateUtilTest {
 
 		Assert.assertFalse(DateUtil.isOverlap(realStartTime1,realEndTime1,startTime,endTime));
 		Assert.assertFalse(DateUtil.isOverlap(startTime,endTime,realStartTime1,realEndTime1));
+	}
 
+	@Test
+	public void isInTest(){
+		String sourceStr = "2022-04-19 00:00:00";
+		String startTimeStr = "2022-04-19 00:00:00";
+		String endTimeStr = "2022-04-19 23:59:59";
+		boolean between = DateUtil.isIn(DateUtil.parse(startTimeStr),
+				DateUtil.parse(endTimeStr),
+				DateUtil.parse(sourceStr));
+		Assert.assertTrue(between);
 	}
 }