当天24点时间戳，当前日期时间戳

public class Tiem {

 public static void main(String[] args) throws ParseException {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  String date = sdf.format(new Date());
  String  tiem=  String.valueOf(sdf.parse(date).getTime()/1000); 
  System.out.println(date);
  System.out.println(tiem);
  System.out.println(timeStamp());
  System.out.println(getTimesnight());
  System.out.println(getTimesnight()-timeStamp());
  
  
 }
 
    //获得当天24点时间
 public static int getTimesnight(){
  Calendar cal = Calendar.getInstance();
  cal.set(Calendar.HOUR_OF_DAY, 24);
  cal.set(Calendar.SECOND, 0);
  cal.set(Calendar.MINUTE, 0);
  cal.set(Calendar.MILLISECOND, 0);
  return (int) (cal.getTimeInMillis()/1000);
 }
 
 /**
  * 日期格式字符串转换成时间戳
  * @param date 字符串日期
  * @param format 如：yyyy-MM-dd HH:mm:ss
  * @return
  */ 
 public static String date2TimeStamp(String date_str,String format){ 
     try { 
         SimpleDateFormat sdf = new SimpleDateFormat(format); 
         return String.valueOf(sdf.parse(date_str).getTime()/1000); 
     } catch (Exception e) { 
         e.printStackTrace(); 
     } 
     return ""; 
 } 
  
 /**
  * 取得当前时间戳（精确到秒）
  * @return
  */ 
 public static int timeStamp(){ 
     long time = System.currentTimeMillis(); 
     return   (int) (time/1000);
 } 
}