JAVA Calendar

public static int timeCompare(String time1, String time2){
       int result = 1;
       DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
       Calendar c1 = Calendar.getInstance();
       Calendar c2 = Calendar.getInstance();
       try {
           c1.setTime(df.parse(time1));
           c2.setTime(df.parse(time2));
       } catch (Exception e) {
           System.out.println(e.getMessage());
       }
       result = c1.compareTo(c2);
       return result;
    }

 

time1与time2对比，正值 time1大

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    publicstatic String getAddDaySpecialDate(String specialDate, int day){
       if (StringCheck.isN(specialDate)) {
           return null;
       }
       try {
           SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-ddHH:mm:ss");
           Calendar calendar = Calendar.getInstance();
           calendar.setTime(dateFormat.parse(specialDate));
           calendar.add(Calendar.DATE, day);
           return dateFormat.format(calendar.getTime());
       } catch (Exception ex) {
           return null;
       }
    }
   
    publicstatic String getYearMonthAndDayByDate(String date){
       if (StringCheck.isN(date)) {
           return null;
       }
       try {
           SimpleDateFormat dateFormat = newSimpleDateFormat("yyyy-MM-dd");
           Calendar calendar = Calendar.getInstance();
           calendar.setTime(dateFormat.parse(date));
           return dateFormat.format(calendar.getTime());
       } catch (Exception ex) {
           return null;
       }
    }
   
    publicstatic String getHourByDate(String date){
       if (StringCheck.isN(date)) {
           return null;
       }
       try {
           SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-ddHH:mm:ss");
           Calendar c = Calendar.getInstance();
           c.setTime(dateFormat.parse(date));
           c.get(Calendar.HOUR_OF_DAY);
           return c.get(Calendar.HOUR_OF_DAY) + "";
       } catch (Exception ex) {
           return null;
       }
    }