接口文档的支持

yzg-util-base/src/main/java/com/yanzuoguang/util/helper/DateHelper.java

@@ -17,9 +17,12 @@ import java.util.Date;
  */
 public class DateHelper {
 
+    private static final String FORMAT_YEAR_STRING = "yyyy-01-01";
+    private static final String FORMAT_MONTH_STRING = "yyyy-MM-01";
     private static final String FORMAT_DAY_STRING = "yyyy-MM-dd";
     private static final String FORMAT_DAY_HOUR_STRING = "yyyy-MM-dd HH:00:00";
     private static final String FORMAT_SECOND_STRING = "yyyy-MM-dd HH:mm:ss";
+
     private static final int MONTH_1 = 1;
     private static final int MONTH_2 = 2;
     private static final int MONTH_3 = 3;
@@ -278,9 +281,7 @@ public class DateHelper {
      * @return 返回的日期
      */
     public static Date getMonthStart(Date date) {
-        Calendar cal = getDayCalendarBegin(date);
-        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
-        return cal.getTime();
+        return DateHelper.getDateTime( getDate(date, FORMAT_MONTH_STRING));
     }
 
     /**
@@ -302,10 +303,7 @@ public class DateHelper {
      * @return 返回值
      */
     public static Date getYearStart(Date date) {
-        Calendar cal = Calendar.getInstance();
-        cal.setTime(date);
-        cal.set(cal.get(Calendar.YEAR), 0, 0, 0, 0, 0);
-        return cal.getTime();
+        return DateHelper.getDateTime( getDate(date, FORMAT_YEAR_STRING));
     }
 
     /**