日期工具类

/**
  * 日期工具类
  */
public  class  DateUtils {
   
     /**
      * 获取今天
      * @return String
      * */
     public  static  String getToday(){
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format( new  Date());
     }
     /**
      * 获取昨天
      * @return String
      * */
     public  static  String getYestoday(){
         Calendar cal=Calendar.getInstance();
         cal.add(Calendar.DATE,-1);
         Date time=cal.getTime();
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format(time);
     }
     /**
      * 获取本月开始日期
      * @return String
      * **/
     public  static  String getMonthStart(){
         Calendar cal=Calendar.getInstance();
         cal.add(Calendar.MONTH, 0);
         cal. set (Calendar.DAY_OF_MONTH, 1);
         Date time=cal.getTime();
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format(time)+" 00：00：00;
     }
     /**
      * 获取本月最后一天
      * @return String
      * **/
     public  static  String getMonthEnd(){
         Calendar cal=Calendar.getInstance();
         cal. set (Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
         Date time=cal.getTime();
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format(time)+ " 23:59:59" ;
     }
     /**
      * 获取本周的第一天
      * @return String
      * **/
     public  static  String getWeekStart(){
         Calendar cal=Calendar.getInstance();
         cal.add(Calendar.WEEK_OF_MONTH, 0);
         cal. set (Calendar.DAY_OF_WEEK, 2);
         Date time=cal.getTime();
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format(time)+ " 00:00:00" ;
     }
     /**
      * 获取本周的最后一天
      * @return String
      * **/
     public  static  String getWeekEnd(){
         Calendar cal=Calendar.getInstance();
         cal. set (Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK));
         cal.add(Calendar.DAY_OF_WEEK, 1);
         Date time=cal.getTime();
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format(time)+ " 23:59:59" ;
     }
     /**
      * 获取本年的第一天
      * @return String
      * **/
     public  static  String getYearStart(){
         return  new  SimpleDateFormat( "yyyy" ).format( new  Date())+ "-01-01" ;
     }
   
     /**
      * 获取本年的最后一天
      * @return String
      * **/
     public  static  String getYearEnd(){
         Calendar calendar = Calendar.getInstance();
         calendar. set (Calendar.MONTH,calendar.getActualMaximum(Calendar.MONTH));
         calendar. set (Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
         Date currYearLast = calendar.getTime();
         return  new  SimpleDateFormat( "yyyy-MM-dd" ).format(currYearLast)+ " 23:59:59" ;
     }
}