获取当前Date日期前后一个月

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date now = new Date();
//当前日期
String currentDate =   df.format(now);
String minDateStr = "";
Calendar calc =Calendar.getInstance();  
calc.setTime(now);
//当前日期7天后  
calc.add(Calendar.DATE, 7);
//当前日期一个月后
  calc.add(Calendar.MONTH, 1);
Date minDate = calc.getTime();  
minDateStr = df.format(minDate);