diff --git a/README.md b/README.md
index 25164ab..375fc2a 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ lunar是一款无第三方依赖的公历(阳历)、农历(阴历、老黄历)
 <dependency>
   <groupId>cn.6tail</groupId>
   <artifactId>lunar</artifactId>
-  <version>1.3.1</version>
+  <version>1.3.2</version>
 </dependency>
 ```
 
diff --git a/README_EN.md b/README_EN.md
index 0adae11..d3c92e0 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -12,7 +12,7 @@ lunar is a calendar library for Solar and Chinese Lunar.
 <dependency>
   <groupId>cn.6tail</groupId>
   <artifactId>lunar</artifactId>
-  <version>1.3.1</version>
+  <version>1.3.2</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index 83e9565..301dab2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
     <groupId>cn.6tail</groupId>
     <artifactId>lunar</artifactId>
     <packaging>jar</packaging>
-    <version>1.3.1</version>
+    <version>1.3.2</version>
     <name>${project.groupId}:${project.artifactId}</name>
     <url>https://github.com/6tail/lunar-java</url>
     <description>a calendar library for Solar and Chinese Lunar</description>
diff --git a/src/main/java/com/nlf/calendar/Solar.java b/src/main/java/com/nlf/calendar/Solar.java
index b6448ae..3580534 100644
--- a/src/main/java/com/nlf/calendar/Solar.java
+++ b/src/main/java/com/nlf/calendar/Solar.java
@@ -86,8 +86,11 @@ public Solar(int year, int month, int day, int hour, int minute, int second) {
         throw new IllegalArgumentException(String.format("wrong solar year %d month %d day %d", year, month, day));
       }
     }
-    if (hour < 0 || hour > 23) {
-      throw new IllegalArgumentException(String.format("wrong hour %d", hour));
+    if (month < 1 || month > 12) {
+      throw new IllegalArgumentException(String.format("wrong month %d", month));
+    }
+    if (day < 1 || day > 31) {
+      throw new IllegalArgumentException(String.format("wrong day %d", day));
     }
     if (minute < 0 || minute > 59) {
       throw new IllegalArgumentException(String.format("wrong minute %d", minute));
@@ -618,30 +621,35 @@ public int subtractMinute(Solar solar) {
   public boolean isAfter(Solar solar) {
     if (year > solar.getYear()) {
       return true;
-    } else if (year < solar.getYear()) {
+    }
+    if (year < solar.getYear()) {
       return false;
     }
     if (month > solar.getMonth()) {
       return true;
-    } else if (month < solar.getMonth()) {
+    }
+    if (month < solar.getMonth()) {
       return false;
     }
     if (day > solar.getDay()) {
       return true;
-    } else if (day < solar.getDay()) {
+    }
+    if (day < solar.getDay()) {
       return false;
     }
     if (hour > solar.getHour()) {
       return true;
-    } else if (hour < solar.getHour()) {
+    }
+    if (hour < solar.getHour()) {
       return false;
     }
     if (minute > solar.getMinute()) {
       return true;
-    } else if (minute < solar.getMinute()) {
+    }
+    if (minute < solar.getMinute()) {
       return false;
     }
-    return second > solar.second;
+    return second > solar.getSecond();
   }
 
   /**
@@ -652,30 +660,35 @@ public boolean isAfter(Solar solar) {
   public boolean isBefore(Solar solar) {
     if (year > solar.getYear()) {
       return false;
-    } else if (year < solar.getYear()) {
+    }
+    if (year < solar.getYear()) {
       return true;
     }
     if (month > solar.getMonth()) {
       return false;
-    } else if (month < solar.getMonth()) {
+    }
+    if (month < solar.getMonth()) {
       return true;
     }
     if (day > solar.getDay()) {
       return false;
-    } else if (day < solar.getDay()) {
+    }
+    if (day < solar.getDay()) {
       return true;
     }
     if (hour > solar.getHour()) {
       return false;
-    } else if (hour < solar.getHour()) {
+    }
+    if (hour < solar.getHour()) {
       return true;
     }
     if (minute > solar.getMinute()) {
       return false;
-    } else if (minute < solar.getMinute()) {
+    }
+    if (minute < solar.getMinute()) {
       return true;
     }
-    return second < solar.second;
+    return second < solar.getSecond();
   }
 
   /**
@@ -691,8 +704,7 @@ public Solar nextYear(int years) {
     if (2 == m) {
       if (d > 28) {
         if (!SolarUtil.isLeapYear(y)) {
-          d -= 28;
-          m++;
+          d = 28;
         }
       }
     }
@@ -719,8 +731,7 @@ public Solar nextMonth(int months) {
     if (2 == m) {
       if (d > 28) {
         if (!SolarUtil.isLeapYear(y)) {
-          d -= 28;
-          m++;
+          d = 28;
         }
       }
     }
@@ -742,33 +753,36 @@ public Solar next(int days) {
     int y = year;
     int m = month;
     int d = day;
+    if (1582 == y && 10 == m) {
+      if (d > 4) {
+        d -= 10;
+      }
+    }
     if (days > 0) {
-      d = day + days;
+      d += days;
       int daysInMonth = SolarUtil.getDaysOfMonth(y, m);
       while (d > daysInMonth) {
         d -= daysInMonth;
         m++;
         if (m > 12) {
-          m -= 12;
+          m = 1;
           y++;
         }
         daysInMonth = SolarUtil.getDaysOfMonth(y, m);
       }
     } else if (days < 0) {
-      int rest = -days;
-      while (d <= rest) {
-        rest -= d;
+      while (d + days <= 0) {
         m--;
         if (m < 1) {
           m = 12;
           y--;
         }
-        d = SolarUtil.getDaysOfMonth(y, m);
+        d += SolarUtil.getDaysOfMonth(y, m);
       }
-      d -= rest;
+      d += days;
     }
     if (1582 == y && 10 == m) {
-      if (d > 4 && d < 15) {
+      if (d > 4 ) {
         d += 10;
       }
     }
diff --git a/src/test/java/test/SolarTest.java b/src/test/java/test/SolarTest.java
index c352107..431b493 100644
--- a/src/test/java/test/SolarTest.java
+++ b/src/test/java/test/SolarTest.java
@@ -1,5 +1,6 @@
 package test;
 
+import com.nlf.calendar.Lunar;
 import com.nlf.calendar.Solar;
 import com.nlf.calendar.util.SolarUtil;
 import org.junit.Assert;
@@ -145,4 +146,29 @@ public void test22(){
     Assert.assertEquals(355, days);
   }
 
+  @Test
+  public void test23(){
+    Solar solar = Solar.fromYmd(1991, 5, 12);
+    Lunar lunar = solar.getLunar();
+    Assert.assertEquals("壬午", lunar.getDayInGanZhi());
+  }
+
+  @Test
+  public void test24(){
+    Solar solar = new Solar(1582, 10, 15);
+    Assert.assertEquals("1582-09-30", solar.next(-5).toYmd());
+  }
+
+  @Test
+  public void test25(){
+    Solar solar = new Solar(1582, 10, 15);
+    Assert.assertEquals("1582-10-04", solar.next(-1).toYmd());
+  }
+
+  @Test
+  public void test26(){
+    Solar solar = new Solar(1582, 10, 15);
+    Assert.assertEquals("1582-09-29", solar.next(-6).toYmd());
+  }
+
 }