diff --git a/README.md b/README.md
index 7802e38..80c8325 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>1.2.28</version>
+  <version>1.2.29</version>
 </dependency>
 ```
 
diff --git a/README_EN.md b/README_EN.md
index cd74f53..8e44a4b 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>1.2.28</version>
+  <version>1.2.29</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index 9e18491..c853312 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
     <groupId>cn.6tail</groupId>
     <artifactId>lunar</artifactId>
     <packaging>jar</packaging>
-    <version>1.2.28</version>
+    <version>1.2.29</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/ExactDate.java b/src/main/java/com/nlf/calendar/ExactDate.java
index a625132..70971ae 100644
--- a/src/main/java/com/nlf/calendar/ExactDate.java
+++ b/src/main/java/com/nlf/calendar/ExactDate.java
@@ -52,27 +52,7 @@ public class ExactDate {
    * @return 天数
    */
   public static int getDaysBetween(int ay, int am, int ad, int by, int bm, int bd) {
-    int n;
-    int days;
-    int i;
-    if (ay == by) {
-      n = SolarUtil.getDaysInYear(by, bm, bd) - SolarUtil.getDaysInYear(ay, am, ad);
-    } else if (ay > by) {
-      days = SolarUtil.getDaysOfYear(by) - SolarUtil.getDaysInYear(by, bm, bd);
-      for (i = by + 1; i < ay; i++) {
-        days += SolarUtil.getDaysOfYear(i);
-      }
-      days += SolarUtil.getDaysInYear(ay, am, ad);
-      n = -days;
-    } else {
-      days = SolarUtil.getDaysOfYear(ay) - SolarUtil.getDaysInYear(ay, am, ad);
-      for (i = ay + 1; i < by; i++) {
-        days += SolarUtil.getDaysOfYear(i);
-      }
-      days += SolarUtil.getDaysInYear(by, bm, bd);
-      n = days;
-    }
-    return n;
+    return SolarUtil.getDaysBetween(ay, am, ad, by, bm, bd);
   }
 
   /**
@@ -83,6 +63,6 @@ public class ExactDate {
    * @return 天数
    */
   public static int getDaysBetween(Calendar calendar0, Calendar calendar1) {
-    return getDaysBetween(calendar0.get(Calendar.YEAR), calendar0.get(Calendar.MONTH) + 1, calendar0.get(Calendar.DATE), calendar1.get(Calendar.YEAR), calendar1.get(Calendar.MONTH) + 1, calendar1.get(Calendar.DATE));
+    return SolarUtil.getDaysBetween(calendar0.get(Calendar.YEAR), calendar0.get(Calendar.MONTH) + 1, calendar0.get(Calendar.DATE), calendar1.get(Calendar.YEAR), calendar1.get(Calendar.MONTH) + 1, calendar1.get(Calendar.DATE));
   }
 }
diff --git a/src/main/java/com/nlf/calendar/Solar.java b/src/main/java/com/nlf/calendar/Solar.java
index 6d50e48..079d116 100644
--- a/src/main/java/com/nlf/calendar/Solar.java
+++ b/src/main/java/com/nlf/calendar/Solar.java
@@ -277,64 +277,38 @@ public class Solar {
   public static List<Solar> fromBaZi(String yearGanZhi, String monthGanZhi, String dayGanZhi, String timeGanZhi, int sect, int baseYear) {
     sect = (1 == sect) ? 1 : 2;
     List<Solar> l = new ArrayList<Solar>();
-    Solar today = new Solar();
-    Lunar lunar = today.getLunar();
-    int offsetYear = LunarUtil.getJiaZiIndex(lunar.getYearInGanZhiExact()) - LunarUtil.getJiaZiIndex(yearGanZhi);
-    if (offsetYear < 0) {
-      offsetYear = offsetYear + 60;
+    List<Integer> years = new ArrayList<Integer>();
+    Solar today = fromDate(new Date());
+    int offsetYear = LunarUtil.getJiaZiIndex(today.getLunar().getYearInGanZhiExact())-LunarUtil.getJiaZiIndex(yearGanZhi);
+    if(offsetYear < 0){
+      offsetYear += 60;
+    }
+    int startYear = today.getYear() - offsetYear - 1;
+    while (startYear >= baseYear) {
+      years.add(startYear);
+      startYear -= 60;
     }
-    int startYear = lunar.getYear() - offsetYear;
     int hour = 0;
     String timeZhi = timeGanZhi.substring(1);
-    for (int i = 0, j = LunarUtil.ZHI.length; i < j; i++) {
-      if (LunarUtil.ZHI[i].equals(timeZhi)) {
+    for(int i = 0, j = LunarUtil.ZHI.length; i < j; i++){
+      if(LunarUtil.ZHI[i].equals(timeZhi)){
         hour = (i - 1) * 2;
       }
     }
-    while (startYear >= baseYear) {
-      int year = startYear - 1;
-      int counter = 0;
-      int month = 12;
-      int day;
-      boolean found = false;
-      while (counter < 15) {
-        if (year >= baseYear) {
-          day = 1;
-          Solar solar = new Solar(year, month, day, hour, 0, 0);
-          lunar = solar.getLunar();
-          if (lunar.getYearInGanZhiExact().equals(yearGanZhi) && lunar.getMonthInGanZhiExact().equals(monthGanZhi)) {
-            found = true;
-            break;
-          }
-        }
-        month++;
-        if (month > 12) {
-          month = 1;
-          year++;
-        }
-        counter++;
-      }
-      if (found) {
-        counter = 0;
-        month--;
-        if (month < 1) {
-          month = 12;
-          year--;
-        }
-        day = 1;
-        Solar solar = new Solar(year, month, day, hour, 0, 0);
-        while (counter < 61) {
-          lunar = solar.getLunar();
+    for (Integer integer : years) {
+      inner: for (int x = 0; x < 3; x++) {
+        int year = integer + x;
+        Solar solar = fromYmdHms(year, 1, 1, hour, 0, 0);
+        while (solar.getYear() == year) {
+          Lunar lunar = solar.getLunar();
           String dgz = (2 == sect) ? lunar.getDayInGanZhiExact2() : lunar.getDayInGanZhiExact();
           if (lunar.getYearInGanZhiExact().equals(yearGanZhi) && lunar.getMonthInGanZhiExact().equals(monthGanZhi) && dgz.equals(dayGanZhi) && lunar.getTimeInGanZhi().equals(timeGanZhi)) {
             l.add(solar);
-            break;
+            break inner;
           }
           solar = solar.next(1);
-          counter++;
         }
       }
-      startYear -= 60;
     }
     return l;
   }
diff --git a/src/main/java/com/nlf/calendar/util/SolarUtil.java b/src/main/java/com/nlf/calendar/util/SolarUtil.java
index 3f70559..2d47a13 100644
--- a/src/main/java/com/nlf/calendar/util/SolarUtil.java
+++ b/src/main/java/com/nlf/calendar/util/SolarUtil.java
@@ -157,6 +157,9 @@ public class SolarUtil {
    * @return 天数
    */
   public static int getDaysOfYear(int year) {
+    if (1582 == year) {
+      return 355;
+    }
     return isLeapYear(year) ? 366 : 365;
   }
 
@@ -193,10 +196,15 @@ public class SolarUtil {
     for (int i = 1; i < month; i++) {
       days += getDaysOfMonth(year, i);
     }
-    days += day;
-    if (1582 == year && 10 == month && day >= 15) {
-      days -= 10;
+    int d = day;
+    if (1582 == year && 10 == month) {
+      if (day >= 15) {
+        d -= 10;
+      } else if (day > 4) {
+        throw new IllegalArgumentException(String.format("wrong solar year %d month %d day %d", year, month, day));
+      }
     }
+    days += d;
     return days;
   }
 
@@ -213,4 +221,64 @@ public class SolarUtil {
     int week = ExactDate.fromYmd(year, month, 1).get(Calendar.DAY_OF_WEEK) - 1;
     return (int) Math.ceil((days + week - start) * 1D / WEEK.length);
   }
+
+  /**
+   * 获取两个日期之间相差的天数（如果日期a比日期b小，天数为正，如果日期a比日期b大，天数为负）
+   *
+   * @param ay 年a
+   * @param am 月a
+   * @param ad 日a
+   * @param by 年b
+   * @param bm 月b
+   * @param bd 日b
+   * @return 天数
+   */
+  public static int getDaysBetween(int ay, int am, int ad, int by, int bm, int bd) {
+    int n;
+    int days;
+    int i;
+    if (ay == by) {
+      n = getDaysInYear(by, bm, bd) - getDaysInYear(ay, am, ad);
+    } else if (ay > by) {
+      days = getDaysOfYear(by) - getDaysInYear(by, bm, bd);
+      for (i = by + 1; i < ay; i++) {
+        days += getDaysOfYear(i);
+      }
+      days += getDaysInYear(ay, am, ad);
+      n = -days;
+    } else {
+      days = getDaysOfYear(ay) - getDaysInYear(ay, am, ad);
+      for (i = ay + 1; i < by; i++) {
+        days += getDaysOfYear(i);
+      }
+      days += getDaysInYear(by, bm, bd);
+      n = days;
+    }
+    return n;
+  }
+
+  public static int getWeek(int y, int m, int d) {
+    if (1582 == y && 10 == m) {
+      if (d > 4 && d < 15) {
+        throw new IllegalArgumentException(String.format("wrong solar year %d month %d day %d", y, m, d));
+      }
+    }
+    Calendar start = ExactDate.fromYmd(1582, 10, 15);
+    Calendar current = ExactDate.fromYmd(y, m, d);
+    // 蔡勒公式
+    if (m < 3) {
+      m += 12;
+      y--;
+    }
+    int c = y/100;
+    y = y - c * 100;
+    int w;
+    int x = y + y / 4 + c / 4 - 2 * c;
+    if (current.before(start)) {
+      w = (x + (13*(m+1))/5 + d + 2) % 7;
+    } else {
+      w = (x + (26*(m+1))/10 + d - 1) % 7;
+    }
+    return (w + 7) % 7;
+  }
 }
diff --git a/src/test/java/test/BaZiTest.java b/src/test/java/test/BaZiTest.java
index abd80a0..9f89c9f 100644
--- a/src/test/java/test/BaZiTest.java
+++ b/src/test/java/test/BaZiTest.java
@@ -6,6 +6,7 @@ import com.nlf.calendar.Solar;
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -250,20 +251,71 @@ public class BaZiTest {
 
   @Test
   public void testBaZi2Solar() {
-    Solar solar = Solar.fromYmdHms(2027,1,27,12,0,0);
-    System.out.println(solar.getLunar().getEightChar().toString());
-    List<Solar> l = Solar.fromBaZi("丙午","辛丑","丙午","甲午");
-    for(Solar s:l){
-      System.out.println(s.toFullString());
+    List<Solar> l = Solar.fromBaZi("丙辰","丁酉","丙子","甲午");
+    List<String> actual = new ArrayList<String>();
+    for (Solar solar : l) {
+      actual.add(solar.toYmdHms());
     }
+
+    List<String> expected = new ArrayList<String>();
+    expected.add("1976-09-21 12:00:00");
+    expected.add("1916-10-06 12:00:00");
+    Assert.assertEquals(expected, actual);
   }
 
   @Test
   public void testBaZi2Solar1() {
     List<Solar> l = Solar.fromBaZi("壬寅","庚戌","己未","乙亥");
-    for(Solar s:l){
-      System.out.println(s.toFullString());
+    List<String> actual = new ArrayList<String>();
+    for (Solar solar : l) {
+      actual.add(solar.toYmdHms());
     }
+
+    List<String> expected = new ArrayList<String>();
+    expected.add("2022-11-02 22:00:00");
+    Assert.assertEquals(expected, actual);
+  }
+
+  @Test
+  public void testBaZi2Solar2() {
+    List<Solar> l = Solar.fromBaZi("己卯","辛未","甲戌","壬申");
+    List<String> actual = new ArrayList<String>();
+    for (Solar solar : l) {
+      actual.add(solar.toYmdHms());
+    }
+
+    List<String> expected = new ArrayList<String>();
+    expected.add("1999-07-21 16:00:00");
+    expected.add("1939-08-05 16:00:00");
+    Assert.assertEquals(expected, actual);
+  }
+
+  @Test
+  public void testBaZi2Solar3() {
+    List<Solar> l = Solar.fromBaZi("庚子","戊子","己卯","庚午");
+    List<String> actual = new ArrayList<String>();
+    for (Solar solar : l) {
+      actual.add(solar.toYmdHms());
+    }
+
+    List<String> expected = new ArrayList<String>();
+    expected.add("1960-12-17 12:00:00");
+    expected.add("1901-01-01 12:00:00");
+    Assert.assertEquals(expected, actual);
+  }
+
+  @Test
+  public void testBaZi2Solar4() {
+    List<Solar> l = Solar.fromBaZi("庚子","癸未","乙丑","丁亥");
+    List<String> actual = new ArrayList<String>();
+    for (Solar solar : l) {
+      actual.add(solar.toYmdHms());
+    }
+
+    List<String> expected = new ArrayList<String>();
+    expected.add("2020-07-21 22:00:00");
+    expected.add("1960-08-05 22:00:00");
+    Assert.assertEquals(expected, actual);
   }
 
   @Test
diff --git a/src/test/java/test/LunarTest.java b/src/test/java/test/LunarTest.java
index 641dfcd..08d952f 100644
--- a/src/test/java/test/LunarTest.java
+++ b/src/test/java/test/LunarTest.java
@@ -447,4 +447,16 @@ public class LunarTest {
     Assert.assertEquals("秋社", lunar.getOtherFestivals().get(0));
   }
 
+  @Test
+  public void test62() {
+    Lunar lunar = Lunar.fromYmd(1582, 9, 18);
+    Assert.assertEquals("1582-10-04", lunar.getSolar().toString());
+  }
+
+  @Test
+  public void test63() {
+    Lunar lunar = Lunar.fromYmd(1582, 9, 19);
+    Assert.assertEquals("1582-10-15", lunar.getSolar().toString());
+  }
+
 }
diff --git a/src/test/java/test/SolarTest.java b/src/test/java/test/SolarTest.java
index 3a3adc6..c352107 100644
--- a/src/test/java/test/SolarTest.java
+++ b/src/test/java/test/SolarTest.java
@@ -79,4 +79,70 @@ public class SolarTest {
     Assert.assertEquals("全国中小学生安全教育日",solar.getFestivals().get(0));
   }
 
+  @Test
+  public void test12(){
+    Solar solar = new Solar(2022, 1, 1);
+    Assert.assertEquals("2022-01-02", solar.next(1).toYmd());
+  }
+
+  @Test
+  public void test13(){
+    Solar solar = new Solar(2022, 1, 31);
+    Assert.assertEquals("2022-02-01", solar.next(1).toYmd());
+  }
+
+  @Test
+  public void test14(){
+    Solar solar = new Solar(2022, 1, 1);
+    Assert.assertEquals("2023-01-01", solar.next(365).toYmd());
+  }
+
+  @Test
+  public void test15(){
+    Solar solar = new Solar(2023, 1, 1);
+    Assert.assertEquals("2022-01-01", solar.next(-365).toYmd());
+  }
+
+  @Test
+  public void test16(){
+    Solar solar = new Solar(1582, 10, 4);
+    Assert.assertEquals("1582-10-15", solar.next(1).toYmd());
+  }
+
+  @Test
+  public void test17(){
+    Solar solar = new Solar(1582, 10, 4);
+    Assert.assertEquals("1582-11-01", solar.next(18).toYmd());
+  }
+
+  @Test
+  public void test18(){
+    Solar solar = new Solar(1582, 11, 1);
+    Assert.assertEquals("1582-10-04", solar.next(-18).toYmd());
+  }
+
+  @Test
+  public void test19(){
+    Solar solar = new Solar(1582, 11, 1);
+    Assert.assertEquals("1582-10-15", solar.next(-17).toYmd());
+  }
+
+  @Test
+  public void test20(){
+    int days = SolarUtil.getDaysBetween(1582, 10, 4, 1582, 10, 15);
+    Assert.assertEquals(1, days);
+  }
+
+  @Test
+  public void test21(){
+    int days = SolarUtil.getDaysBetween(1582, 10, 4, 1582, 11, 1);
+    Assert.assertEquals(18, days);
+  }
+
+  @Test
+  public void test22(){
+    int days = SolarUtil.getDaysBetween(1582, 1, 1, 1583, 1, 1);
+    Assert.assertEquals(355, days);
+  }
+
 }
diff --git a/src/test/java/test/WeekTest.java b/src/test/java/test/WeekTest.java
index fd79e4b..091f11a 100644
--- a/src/test/java/test/WeekTest.java
+++ b/src/test/java/test/WeekTest.java
@@ -1,5 +1,6 @@
 package test;
 
+import com.nlf.calendar.Solar;
 import com.nlf.calendar.SolarWeek;
 import com.nlf.calendar.util.SolarUtil;
 import org.junit.Assert;
@@ -41,4 +42,16 @@ public class WeekTest {
     //当周第一天（本月）
     Assert.assertEquals("2019-05-01",week.getFirstDayInMonth().toString());
   }
+
+  @Test
+  public void test1(){
+    Solar solar = Solar.fromYmd(1582, 10, 1);
+    Assert.assertEquals(1, solar.getWeek());
+  }
+
+  @Test
+  public void test2(){
+    Solar solar = Solar.fromYmd(1582, 10, 15);
+    Assert.assertEquals(5, solar.getWeek());
+  }
 }