获取最近连续日期年月日

近一个月年月日获取

 // i 取 7，15 ，30 即可获取仅一周，半月，一个月的 时间集合 
 List<String>  recentTimeLIst  =  ArrayList<String>();
  for (int i = 0; i <30 ; i++) {
            Calendar test = Calendar.getInstance();
            SimpleDateFormat dd  = new SimpleDateFormat("yyyy-MM-dd");
            test.add(Calendar.DATE, -i);
            String formatTime= dd.format(test.getTime());
            recentTimeLIst.add(formatTime);
        }

近几个月第一天和最后一天的集合获取

// 最近几个月最后一天的获取
public List<String> getResultMonthLastDay(int month) {
        List<String> resultList = new ArrayList<String>();
        for (int i = 0; i < month; i++) {
            Calendar c = Calendar.getInstance();
            c.add(Calendar.MONTH, -i);
            c.set(Calendar.DAY_OF_MONTH,c.getActualMaximum(Calendar.DAY_OF_MONTH));
            String monthLastDay = dd.format(c.getTime());
            resultList.add(monthLastDay);
        }
        return resultList;
    }

// 最近几个月第一天的获取
 public List<String> getResultMonthFirstDay(int month) {
        List<String> resultList = new ArrayList<String>();
        for (int i = 0; i < month; i++) {
            String localDate = LocalDate.now().minusMonths(i).toString();
            String s = localDate.substring(0, localDate.lastIndexOf("-")) + "-01";
            resultList.add(s);
        }
        return resultList;
    }

 /**
     * 获得指定日期的前一天
     * @param specifiedDay
     * @return
     * @throws Exception
     */
    public static String getSpecifiedDayBefore(String specifiedDay){
        Calendar calendar = Calendar.getInstance();
        Date date=null;
        try {
            date = new SimpleDateFormat("yyyy-MM-dd 00:00:00").parse(specifiedDay);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        calendar.setTime(date);
        int day=calendar.get(Calendar.DATE);
        calendar.set(Calendar.DATE,day-1);
        String dayBefore=new SimpleDateFormat("yyyy-MM-dd 00:00:00").format(calendar.getTime());
        return dayBefore;
    }
    /**
     * 获得指定日期的后一天
     * @param specifiedDay
     * @return
     */
    public static String getSpecifiedDayAfter(String specifiedDay){
        Calendar calendar = Calendar.getInstance();
        Date date=null;
        try {
            date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        calendar.setTime(date);
        int day=calendar.get(Calendar.DATE);
        calendar.set(Calendar.DATE,day+1);
        String dayAfter=new SimpleDateFormat("yyyy-MM-dd").format(calendar.getTime());
        return dayAfter;
    }
/**
* 获取每年第一天，初始化的日期
*/
  private static Date getYearFirst(int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        return calendar.getTime();
    }

 /**
     * 获取指定日期几个月前的时间
     * @param endDate
     * @param month
     * @return
     */
    public static Date getBeforeMonthDate(Date endDate, Integer month){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(endDate);
        calendar.add(Calendar.MONTH, -month);
        Date resDate = calendar.getTime();
        return resDate;
    }
    /**
     * 获取指定日期几天事假（时分秒为0）
     * @param date
     * @param amount
     * @return
     */
    public static Date getBeforeDay (Date date, int amount){
        if(date == null) {
            throw new IllegalArgumentException("The date must not be null");
        } else {
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            c.add(Calendar.DATE, -amount);
            c.set(Calendar.HOUR_OF_DAY,0);
            c.set(Calendar.MINUTE,0);
            c.set(Calendar.SECOND,0);
            return c.getTime();
        }
    }