修复ChineseDate 闰年闰月节日获取问题

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### 🐞Bug修复
 * 【extra  】      `Sftp``reconnectIfTimeout`方法改为捕获所有异常（issue#3989@Github）
+* 【core   】      修复`ChineseDate `闰年闰月节日获取问题（issue#ICL1BT@Gitee）
 
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 # 5.8.39(2025-06-20)

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

@@ -329,7 +329,7 @@ public class ChineseDate {
 	 * @return 获得农历节日
 	 */
 	public String getFestivals() {
-		return StrUtil.join(",", LunarFestival.getFestivals(this.year, this.month, day));
+		return StrUtil.join(",", LunarFestival.getFestivals(this.year, this.isLeapMonth ? this.month - 1 : this.month, day));
 	}
 
 	/**

hutool-core/src/test/java/cn/hutool/core/date/chinese/IssueICL1BTTest.java

@@ -0,0 +1,21 @@
+package cn.hutool.core.date.chinese;
+
+import cn.hutool.core.date.ChineseDate;
+import cn.hutool.core.date.DateUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Date;
+
+public class IssueICL1BTTest {
+	@Test
+	void getFestivalsTest(){
+		String date = "2025-07-31";
+		Date productionDate = DateUtil.parseDate( date);
+		ChineseDate chineseDate = new ChineseDate(productionDate);
+		System.out.println(chineseDate.isLeapMonth());
+		Assertions.assertTrue(chineseDate.isLeapMonth());
+		String festivals = chineseDate.getFestivals();
+		Assertions.assertEquals("", festivals);
+	}
+}