Java用于取得当前日期相对应的月初，月末，季初，季末，年初，年末时间

 package com.zrar.date;
 import java.util.Calendar;
 /**
  *
  * 描述:此类用于取得当前日期相对应的月初，月末，季初，季末，年初，年末，返回值均为String字符串
  *      1、得到当前日期         today()
  *      2、得到当前月份月初      thisMonth()
  *      3、得到当前月份月底      thisMonthEnd()
  *      4、得到当前季度季初      thisSeason()
  *      5、得到当前季度季末      thisSeasonEnd()
  *      6、得到当前年份年初      thisYear()
  *      7、得到当前年份年底      thisYearEnd()
  *      8、判断输入年份是否为闰年 leapYear
  *
  * 注意事项:  日期格式为：xxxx-yy-zz (eg: 2007-12-05)
  *
  * 实例:
  *
  * @author pure
  */
 public class DateThis {
     private int x;                  // 日期属性：年
     private int y;                  // 日期属性：月
     private int z;                  // 日期属性：日
     private Calendar localTime;     // 当前日期
     public DateThis() {
         localTime = Calendar.getInstance();
     }
     /**
      * 功能：得到当前日期 格式为：xxxx-yy-zz (eg: 2007-12-05)<br>
      * @return String
      * @author pure
      */
     public String today() {
         String strY = null;
         String strZ = null;
         x = localTime.get(Calendar.YEAR);
         y = localTime.get(Calendar.MONTH) + 1;
         z = localTime.get(Calendar.DATE);
         strY = y >= 10 ? String.valueOf(y) : ("0" + y);
         strZ = z >= 10 ? String.valueOf(z) : ("0" + z);
         return x + "-" + strY + "-" + strZ;
     }
     /**
      * 功能：得到当前月份月初 格式为：xxxx-yy-zz (eg: 2007-12-01)<br>
      * @return String
      * @author pure
      */
     public String thisMonth() {
         String strY = null;
         x = localTime.get(Calendar.YEAR);
         y = localTime.get(Calendar.MONTH) + 1;
         strY = y >= 10 ? String.valueOf(y) : ("0" + y);
         return x + "-" + strY + "-01";
     }
     /**
      * 功能：得到当前月份月底 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
      * @return String
      * @author pure
      */
     public String thisMonthEnd() {
         String strY = null;
         String strZ = null;
         boolean leap = false;
         x = localTime.get(Calendar.YEAR);
         y = localTime.get(Calendar.MONTH) + 1;
         if (y == 1 || y == 3 || y == 5 || y == 7 || y == 8 || y == 10 || y == 12) {
             strZ = "31";
         }
         if (y == 4 || y == 6 || y == 9 || y == 11) {
             strZ = "30";
         }
         if (y == 2) {
             leap = leapYear(x);
             if (leap) {
                 strZ = "29";
             }
             else {
                 strZ = "28";
             }
         }
         strY = y >= 10 ? String.valueOf(y) : ("0" + y);
         return x + "-" + strY + "-" + strZ;
     }
     /**
      * 功能：得到当前季度季初 格式为：xxxx-yy-zz (eg: 2007-10-01)<br>
      * @return String
      * @author pure
      */
     public String thisSeason() {
         String dateString = "";
         x = localTime.get(Calendar.YEAR);
         y = localTime.get(Calendar.MONTH) + 1;
         if (y >= 1 && y <= 3) {
             dateString = x + "-" + "01" + "-" + "01";
         }
         if (y >= 4 && y <= 6) {
             dateString = x + "-" + "04" + "-" + "01";
         }
         if (y >= 7 && y <= 9) {
             dateString = x + "-" + "07" + "-" + "01";
         }
         if (y >= 10 && y <= 12) {
             dateString = x + "-" + "10" + "-" + "01";
         }
         return dateString;
     }
     /**
      * 功能：得到当前季度季末 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
      * @return String
      * @author pure
      */
     public String thisSeasonEnd() {
         String dateString = "";
         x = localTime.get(Calendar.YEAR);
         y = localTime.get(Calendar.MONTH) + 1;
         if (y >= 1 && y <= 3) {
             dateString = x + "-" + "03" + "-" + "31";
         }
         if (y >= 4 && y <= 6) {
             dateString = x + "-" + "06" + "-" + "30";
         }
         if (y >= 7 && y <= 9) {
             dateString = x + "-" + "09" + "-" + "30";
         }
         if (y >= 10 && y <= 12) {
             dateString = x + "-" + "12" + "-" + "31";
         }
         return dateString;
     }
     /**
      * 功能：得到当前年份年初 格式为：xxxx-yy-zz (eg: 2007-01-01)<br>
      * @return String
      * @author pure
      */
     public String thisYear() {
         x = localTime.get(Calendar.YEAR);
         return x + "-01" + "-01";
     }
     /**
      * 功能：得到当前年份年底 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
      * @return String
      * @author pure
      */
     public String thisYearEnd() {
         x = localTime.get(Calendar.YEAR);
         return x + "-12" + "-31";
     }
     /**
      * 功能：判断输入年份是否为闰年<br>
      *
      * @param year
      * @return 是：true  否：false
      * @author pure
      */
     public boolean leapYear(int year) {
         boolean leap;
         if (year % 4 == 0) {
             if (year % 100 == 0) {
                 if (year % 400 == 0) leap = true;
                 else leap = false;
             }
             else leap = true;
         }
         else leap = false;
         return leap;
     }
 }