Calendar java calendar (commonly summary)

 

public static String before30Day(String time) {
        DateFormat dateFromat = new SimpleDateFormat(TIME_STAMP_STANDARD);
        try {
            Date parse = dateFromat.parse(time);

            Calendar cal = Calendar.getInstance();// get a calendar by using default timezone and language
            cal.setTime(parse);
            cal.add(Calendar.DAY_OF_MONTH, -30);
            Date date = cal.getTime();
            return dateFromat.format(date);

        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

 

 

 

 

    public  static  void main (String [] args) {
         // get eight districts in Eastern Time 
            Calendar c = Calendar.getInstance (TimeZone.getTimeZone ( " GMT + 08: 00 " ));    
             // get in 
             int year = c. GET ( Calendar.YEAR);   
              // get the month, will be less one day. So + 1'd 
             int month The C =. GET (the Calendar.MONTH) + . 1 ;   
              // get the current number of days 
             int Day = C. GET (Calendar.DAY_OF_MONTH);   
             
                c.add (Calendar.YEAR, . 5 );
                c.add (Calendar.DATE, + 10 );
              // get the current hour 
             int H = C. GET (Calendar.HOUR_OF_DAY);       
              // get the current minute 
             int m = C. GET (Calendar.MINUTE);          
              // get the current second 
             int SE = C. GET (Calendar.SECOND);    
             
             the SimpleDateFormat S = new new the SimpleDateFormat ( " YYYY the mM-dd-HH: mm: SS " );
              // formatting time format 
             String Now = s.format (c.getTime ( ));  
              // get the current date format (Obj): formatting an object to produce a string.
             The System. OUT .println ( " Current Time: " + year + " - " + month The + " - " + Day + "  " + H + " : " + m + " : " + SE); 
             . The System OUT .println ( " current date Now: " + Now); 
    }