SimpleDateFormat dateFormat = new SimpleDateFormat ( "yyyy-MM-dd");    
long now = System.currentTimeMillis(); // 오늘 날짜 받기   2020-01-16

Date date = new Date(now);   // 2020-01-16

 

Calendar cal = Calendar.getInstance();

cal.setTime(date);                // 2020-01-16

cal.add(Calendar.DATE, -15);   //  2020-01-01   15일전으로 

 

String startdate = dateFormat.format(cal.getTime());
String enddate = dateFormat.format(date);

 

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