diff --git a/hutool-core/src/main/java/cn/hutool/v7/core/date/DateModifier.java b/hutool-core/src/main/java/cn/hutool/v7/core/date/DateModifier.java
index 4123449218..278a7331e5 100644
--- a/hutool-core/src/main/java/cn/hutool/v7/core/date/DateModifier.java
+++ b/hutool-core/src/main/java/cn/hutool/v7/core/date/DateModifier.java
@@ -89,7 +89,7 @@ public class DateModifier {
 				case ROUND:
 					final int min = isAM ? 0 : 12;
 					final int max = isAM ? 11 : 23;
-					final int href = (max - min) / 2 + 1;
+					final int href = min + (max - min) / 2 + 1;
 					final int value = calendar.get(Calendar.HOUR_OF_DAY);
 					calendar.set(Calendar.HOUR_OF_DAY, (value < href) ? min : max);
 					break;
diff --git a/hutool-core/src/test/java/cn/hutool/v7/core/date/DateUtilTest.java b/hutool-core/src/test/java/cn/hutool/v7/core/date/DateUtilTest.java
index 039bc04ab2..104799a4a1 100644
--- a/hutool-core/src/test/java/cn/hutool/v7/core/date/DateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/v7/core/date/DateUtilTest.java
@@ -1149,4 +1149,31 @@ public class DateUtilTest {
 		final DateTime dt = DateUtil.parse(dateStr1);
 		assertEquals("2025-07-28 20:00:00", dt.toString());
 	}
+
+	@Test
+	public void cellingAmPmTest(){
+		final String dateStr2 = "2020-02-29 10:59:34";
+		final Date date2 = DateUtil.parse(dateStr2);
+
+
+		DateTime dateTime = DateUtil.ceiling(date2, DateField.AM_PM, false);
+		assertEquals("2020-02-29 11:59:59.999", dateTime.toString(DateFormatPool.NORM_DATETIME_MS_PATTERN));
+
+		dateTime = DateUtil.ceiling(date2, DateField.AM_PM, true);
+		assertEquals("2020-02-29 11:59:59.000", dateTime.toString(DateFormatPool.NORM_DATETIME_MS_PATTERN));
+	}
+
+	@Test void roundAmPmTest() {
+		final String dateStr = "2020-02-29 13:59:34";
+		final Date date = DateUtil.parse(dateStr);
+
+		final DateTime dateTime = DateUtil.round(date, DateField.AM_PM);
+		assertEquals("2020-02-29 12:59:59.000", dateTime.toString(DateFormatPool.NORM_DATETIME_MS_PATTERN));
+
+		final String dateStr2 = "2020-02-29 18:59:34";
+		final Date date2 = DateUtil.parse(dateStr2);
+
+		final DateTime dateTime2 = DateUtil.round(date2, DateField.AM_PM);
+		assertEquals("2020-02-29 23:59:59.000", dateTime2.toString(DateFormatPool.NORM_DATETIME_MS_PATTERN));
+	}
 }