diff --git a/src/Solar.php b/src/Solar.php
index a2c5b48..10495c0 100644
--- a/src/Solar.php
+++ b/src/Solar.php
@@ -541,19 +541,17 @@ public function nextYear($years) {
     $y = $this->year + $years;
     $m = $this->month;
     $d = $this->day;
-    // 2月处理
-    if (2 == $m) {
+    if (1582 == $y && 10 == $m) {
+      if ($d > 4 && $d < 15) {
+        $d += 10;
+      }
+    } else if (2 == $m) {
       if ($d > 28) {
         if (!SolarUtil::isLeapYear($y)) {
           $d = 28;
         }
       }
     }
-    if (1582 == $y && 10 == $m) {
-      if ($d > 4 && $d < 15) {
-        $d += 10;
-      }
-    }
     return self::fromYmdHms($y, $m, $d, $this->hour, $this->minute, $this->second);
   }
 
@@ -567,18 +565,15 @@ public function nextMonth($months) {
     $y = $month->getYear();
     $m = $month->getMonth();
     $d = $this->day;
-    // 2月处理
-    if (2 == $m) {
-      if ($d > 28) {
-        if (!SolarUtil::isLeapYear($y)) {
-          $d = 28;
-        }
-      }
-    }
     if (1582 == $y && 10 == $m) {
       if ($d > 4 && $d < 15) {
         $d += 10;
       }
+    } else {
+      $days = SolarUtil::getDaysOfMonth($y, $m);
+      if ($d > $days) {
+        $d = $days;
+      }
     }
     return self::fromYmdHms($y, $m, $d, $this->hour, $this->minute, $this->second);
   }
diff --git a/src/util/LunarUtil.php b/src/util/LunarUtil.php
index 1fc4a30..9f01076 100644
--- a/src/util/LunarUtil.php
+++ b/src/util/LunarUtil.php
@@ -150,7 +150,7 @@ class LunarUtil
     '6-6' => array('天贶节'),
     '6-24' => array('观莲节'),
     '6-25' => array('五谷母节'),
-    '7-14' => array('中元节'),
+    '7-15' => array('中元节'),
     '7-22' => array('财神节'),
     '7-29' => array('地藏节'),
     '8-1' => array('天灸日'),
diff --git a/test/SolarTest.php b/test/SolarTest.php
index 5df92d5..f79c102 100644
--- a/test/SolarTest.php
+++ b/test/SolarTest.php
@@ -133,5 +133,29 @@ public function test24()
     $solar = Solar::fromYmd(1582, 10, 15);
     $this->assertEquals('1582-09-30', $solar->next(-5)->toYmd());
   }
+
+  public function test25()
+  {
+    $solar = Solar::fromYmd(2023, 8, 31);
+    $this->assertEquals('2023-09-30', $solar->nextMonth(1)->toYmd());
+  }
+
+  public function test26()
+  {
+    $solar = Solar::fromYmd(2023, 8, 31);
+    $this->assertEquals('2023-10-31', $solar->nextMonth(2)->toYmd());
+  }
+
+  public function test27()
+  {
+    $solar = Solar::fromYmd(2023, 8, 31);
+    $this->assertEquals('2024-02-29', $solar->nextMonth(6)->toYmd());
+  }
+
+  public function test28()
+  {
+    $solar = Solar::fromYmd(2023, 8, 31);
+    $this->assertEquals('2025-08-31', $solar->nextYear(2)->toYmd());
+  }
   
 }