diff --git a/hutool-core/src/main/java/cn/hutool/core/date/CalendarUtil.java b/hutool-core/src/main/java/cn/hutool/core/date/CalendarUtil.java
index 107034c51..06c934e98 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/CalendarUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/CalendarUtil.java
@@ -109,7 +109,7 @@ public class CalendarUtil {
 	 * 修改日期为某个时间字段四舍五入时间
 	 *
 	 * @param calendar  {@link Calendar}
-	 * @param dateField 时间字段
+	 * @param dateField 时间字段，即保留到哪个日期字段
 	 * @return 原{@link Calendar}
 	 */
 	public static Calendar round(final Calendar calendar, final DateField dateField) {
diff --git a/hutool-core/src/test/java/cn/hutool/core/date/DateModifierTest.java b/hutool-core/src/test/java/cn/hutool/core/date/DateModifierTest.java
index 6cb741561..56f4a1d16 100644
--- a/hutool-core/src/test/java/cn/hutool/core/date/DateModifierTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/date/DateModifierTest.java
@@ -1,10 +1,10 @@
 package cn.hutool.core.date;
 
-import java.util.Date;
-
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.util.Date;
+
 public class DateModifierTest {
 
 	@Test
@@ -116,4 +116,14 @@ public class DateModifierTest {
 		begin = DateUtil.ceiling(date, DateField.YEAR);
 		Assert.assertEquals("2017-12-31 23:59:59.999", begin.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
 	}
+
+	@Test
+	public void roundTest(){
+		// issues#I5M2I0
+		final String dateStr = "2022-08-12 14:59:21.500";
+		final Date date = DateUtil.parse(dateStr);
+
+		final DateTime dateTime = DateUtil.round(date, DateField.SECOND);
+		Assert.assertEquals("2022-08-12 14:59:21.999", dateTime.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
+	}
 }