版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/inforstack/article/details/46516623
public static void main(String[] args) {
try {
DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.add(Calendar.DATE,7);
System.out.println(formatter.format(calendar.getTime()));
Date createDate = formatter.parse("2015-06-25 07:07:21"); // 创建时间
Date currentDate = formatter.parse("2015-06-25 07:07:22"); //当前时间
System.out.println("创建时间在当前时间之前？" + createDate.before(currentDate));
} catch (ParseException e) {
e.printStackTrace();
}