From fc5e1ecff9e8d92a37eb2a613dcb040a00fcd98c Mon Sep 17 00:00:00 2001
From: asukavuuyn <1346007099@qq.com>
Date: Wed, 26 Nov 2025 15:19:41 +0800
Subject: [PATCH] =?UTF-8?q?fix:12=E5=B0=8F=E6=97=B6=E5=88=B6ceiling?=
 =?UTF-8?q?=E5=92=8Cround=E9=97=AE=E9=A2=98?=
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---
 .../cn/hutool/core/date/DateModifier.java     |  4 +--
 .../cn/hutool/core/date/DateUtilTest.java     | 27 +++++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/hutool-core/src/main/java/cn/hutool/core/date/DateModifier.java b/hutool-core/src/main/java/cn/hutool/core/date/DateModifier.java
index 0fa96638d..69a4cb8ca 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/DateModifier.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DateModifier.java
@@ -73,13 +73,13 @@ public class DateModifier {
 				case ROUND:
 					int min = isAM ? 0 : 12;
 					int max = isAM ? 11 : 23;
-					int href = (max - min) / 2 + 1;
+					int href = min + (max - min) / 2 + 1;
 					int value = calendar.get(Calendar.HOUR_OF_DAY);
 					calendar.set(Calendar.HOUR_OF_DAY, (value < href) ? min : max);
 					break;
 			}
 			// 处理下一级别字段
-			return modify(calendar, dateField + 1, modifyType);
+			return modify(calendar, dateField + 1, modifyType, truncateMillisecond);
 		}
 
 		final int endField = truncateMillisecond ? Calendar.SECOND : Calendar.MILLISECOND;
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 64922020b..c6d5c92a4 100755
--- a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
@@ -130,6 +130,33 @@ public class DateUtilTest {
 		assertEquals("2020-02-29 12:59:59.000", dateTime.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
 	}
 
+	@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);
+		assertEquals("2020-02-29 11:59:59.999", dateTime.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
+
+		dateTime = DateUtil.ceiling(date2, DateField.AM_PM, true);
+		assertEquals("2020-02-29 11:59:59.000", dateTime.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
+	}
+
+	@Test void roundAmPmTest() {
+		final String dateStr = "2020-02-29 13:59:34";
+		final Date date = DateUtil.parse(dateStr);
+
+		DateTime dateTime = DateUtil.round(date, DateField.AM_PM);
+		assertEquals("2020-02-29 12:59:59.000", dateTime.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
+
+		final String dateStr2 = "2020-02-29 18:59:34";
+		final Date date2 = DateUtil.parse(dateStr2);
+
+		DateTime dateTime2 = DateUtil.round(date2, DateField.AM_PM);
+		assertEquals("2020-02-29 23:59:59.000", dateTime2.toString(DatePattern.NORM_DATETIME_MS_PATTERN));
+	}
+
 	@Test
 	public void ceilingDayTest() {
 		final String dateStr2 = "2020-02-29 12:59:34";