得到指定日期当月的第一天和最后一天的日期

    //得到指定日期的第一天的日期,如:2010-08-01
    protected String getMinDateByDate(Date date){
    	Calendar calendar = Calendar.getInstance();
    	calendar.setTime(date);
    	int year 			= calendar.get(Calendar.YEAR);		
		String month 		= (calendar.get(Calendar.MONTH)+1) < 10?"0"+(calendar.get(Calendar.MONTH)+1):(calendar.get(Calendar.MONTH)+1)+"";
		int minDay 			= calendar.getActualMinimum(Calendar.DATE);
		String backMinDate 	= year+"-"+month+"-"+minDay;
		return backMinDate;
    }
    //得到指定日期的最后一天日期,如:2010-08-31
    protected String getMaxDateByDate(Date date){
    	Calendar calendar = Calendar.getInstance();
    	calendar.setTime(date);
    	int year 			= calendar.get(Calendar.YEAR);		
		String month 		= (calendar.get(Calendar.MONTH)+1) < 10?"0"+(calendar.get(Calendar.MONTH)+1):(calendar.get(Calendar.MONTH)+1)+"";
		int maxDay 			= calendar.getActualMaximum(Calendar.DATE);
		String backMaxDate 	= year+"-"+month+"-"+maxDay;
		return backMaxDate;
    }