v1.2.16 补充灶马头相关内容；修复九星错误；新增太岁方位；新增道历天赦日；修复八字转阳历的错误；优化代码。

src/main/java/com/nlf/calendar/ExactDate.java

@@ -1,5 +1,7 @@
 package com.nlf.calendar;
 
+import com.nlf.calendar.util.SolarUtil;
+
 import java.util.Calendar;
 import java.util.Date;
 import java.util.TimeZone;
@@ -20,6 +22,9 @@ public class ExactDate {
     Calendar c = Calendar.getInstance(TIME_ZONE);
     c.set(year, month - 1, day, hour, minute, second);
     c.set(Calendar.MILLISECOND, 0);
+    if (0 == year) {
+      c.add(Calendar.YEAR, 1);
+    }
     return c;
   }
 
@@ -33,4 +38,50 @@ public class ExactDate {
     c.set(Calendar.MILLISECOND, 0);
     return c;
   }
+
+  /**
+   * 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 = 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;
+  }
+
+  /**
+   * 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 calendar0 日期a
+   * @param calendar1 日期b
+   * @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));
+  }
 }