修复DateUtil.betweenYear闰年2月问题

CHANGELOG.md

@@ -15,6 +15,7 @@
 * 【core  】      修复PathMover对目标已存在且只读文件报错错误问题（issue#I95CLT@Gitee）
 * 【json  】      修复JSONUtil序列化和反序列化预期的结果不一致问题（pr#3507@Github）
 * 【http  】      修复CVE-2022-22885，HttpGlobalConfig可选关闭信任host（issue#2042@Github）
+* 【core  】      修复DateUtil.betweenYear闰年2月问题（issue#I97U3J@Gitee）
 
 -------------------------------------------------------------------------------------------------------------
 # 5.8.26(2024-02-10)

hutool-core/src/main/java/cn/hutool/core/date/CalendarUtil.java

@@ -360,6 +360,17 @@ public class CalendarUtil {
 			cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA);
 	}
 
+	/**
+	 * 是否为本月最后一天
+	 *
+	 * @param calendar {@link Calendar}
+	 * @return 是否为本月最后一天
+	 * @since 5.8.27
+	 */
+	public static boolean isLastDayOfMonth(Calendar calendar) {
+		return calendar.get(Calendar.DAY_OF_MONTH) == calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
+	}
+
 	/**
 	 * 比较两个日期是否为同一周
 	 *
@@ -657,7 +668,7 @@ public class CalendarUtil {
 		int age = year - cal.get(Calendar.YEAR);
 
 		//当前日期，则为0岁
-		if (age == 0){
+		if (age == 0) {
 			return 0;
 		}
 

hutool-core/src/main/java/cn/hutool/core/date/DateBetween.java

@@ -137,15 +137,20 @@ public class DateBetween implements Serializable {
 
 		int result = endCal.get(Calendar.YEAR) - beginCal.get(Calendar.YEAR);
 		if (false == isReset) {
+			final int beginMonthBase0 = beginCal.get(Calendar.MONTH);
+			final int endMonthBase0 = endCal.get(Calendar.MONTH);
+			if (beginMonthBase0 < endMonthBase0) {
+				return result;
+			} else if (beginMonthBase0 > endMonthBase0) {
+				return result - 1;
+			} else if (Calendar.FEBRUARY == beginMonthBase0
+				&& CalendarUtil.isLastDayOfMonth(beginCal)
+				&& CalendarUtil.isLastDayOfMonth(endCal)) {
 				// 考虑闰年的2月情况
-			if (Calendar.FEBRUARY == beginCal.get(Calendar.MONTH) && Calendar.FEBRUARY == endCal.get(Calendar.MONTH)) {
-				if (beginCal.get(Calendar.DAY_OF_MONTH) == beginCal.getActualMaximum(Calendar.DAY_OF_MONTH)
-						&& endCal.get(Calendar.DAY_OF_MONTH) == endCal.getActualMaximum(Calendar.DAY_OF_MONTH)) {
 				// 两个日期都位于2月的最后一天，此时月数按照相等对待，此时都设置为1号
 				beginCal.set(Calendar.DAY_OF_MONTH, 1);
 				endCal.set(Calendar.DAY_OF_MONTH, 1);
 			}
-			}
 
 			endCal.set(Calendar.YEAR, beginCal.get(Calendar.YEAR));
 			long between = endCal.getTimeInMillis() - beginCal.getTimeInMillis();

hutool-core/src/test/java/cn/hutool/core/date/DateBetweenTest.java

@@ -75,4 +75,16 @@ public class DateBetweenTest {
 				ChronoUnit.WEEKS);
 		Assert.assertEquals(betweenWeek, betweenWeek2);
 	}
+
+	@Test
+	public void issueI97U3JTest(){
+		String dateStr1 = "2024-02-29 23:59:59";
+		Date sdate = DateUtil.parse(dateStr1);
+
+		String dateStr2 = "2023-03-01 00:00:00";
+		Date edate = DateUtil.parse(dateStr2);
+
+		long result = DateUtil.betweenYear(sdate, edate, false);
+		Assert.assertEquals(0, result);
+	}
 }