java计算时间

来源：互联网发布：dz论坛seo入门教程编辑：程序博客网时间：2024/06/05 19:27

java 获取时间到毫秒

Calendar CD = Calendar.getInstance();

  int YY = CD.get(Calendar.YEAR) ;
  int MM = CD.get(Calendar.MONTH)+1;
  int DD = CD.get(Calendar.DATE);
  int HH = CD.get(Calendar.HOUR_OF_DAY);
  int NN = CD.get(Calendar.MINUTE);
  int SS = CD.get(Calendar.SECOND);
  int MI = CD.get(Calendar.MILLISECOND);

  String timeNow = YY + "/" + MM + "/" + DD + " " + HH + "." + NN + "." + SS + "." + MI;

你可以用时间差来计算啊!
把代码块放在其中就是了.
线程的运行的时间也是类似的
public static void testRunningTime() {
long t1 = System.currentTimeMillis();
// invoke your program here
long t2 = System.currentTimeMillis();
System.out.println("Your program has executed for "
+ (int)((t2-t1)/1000)+ " seconds "
+ ((t2-t1) % 1000) + " micro seconds");
}

/**
* 计算指定日期的上一天
*
* @param dateTime
*            日期，格式为：yyyy-MM-dd
* @return
*/
public static String getBeforeDay(String dateTime) {
   Calendar now = Calendar.getInstance();
   SimpleDateFormat simpledate = new SimpleDateFormat("yyyy-MM-dd");
   Date date = null;
  try {
    date = simpledate.parse(dateTime);
   } catch (ParseException ex) {
    System.out.println("日期格式不符合要求：" + ex.getMessage());
   return null;
   }
   now.setTime(date);
  int year = now.get(Calendar.YEAR);
  int month = now.get(Calendar.MONTH);
  int day = now.get(Calendar.DAY_OF_MONTH) - 1;
   now.set(year, month, day);
   String time = simpledate.format(now.getTime());
  return time;
}

/**
* 计算指定日期的下一天
*
* @param dateTime
*            日期，格式为：yyyy-MM-dd
* @return
*/
public static String getNextDay(String dateTime) {
   Calendar now = Calendar.getInstance();
   SimpleDateFormat simpledate = new SimpleDateFormat("yyyy-MM-dd");
   Date date = null;
  try {
    date = simpledate.parse(dateTime);
   } catch (ParseException ex) {
    System.out.println("日期格式不符合要求：" + ex.getMessage());
   return null;
   }
   now.setTime(date);
  int year = now.get(Calendar.YEAR);
  int month = now.get(Calendar.MONTH);
  int day = now.get(Calendar.DAY_OF_MONTH) + 1;
   now.set(year, month, day);
   String time = simpledate.format(now.getTime());
  return time;
}

/**
* 得到指定月的天数
* @param _year
* @param _month
* @return
*/
public static int getMaxDayOfMonth(int _year, int _month){
   Calendar now = Calendar.getInstance();
  int year = 0;
  int month = 0;
  if(_month==1){
    year = _year - 1;
    month = 12;
   }else{
    year = _year;
    month = _month - 1;
   }

   now.set(Calendar.YEAR, year);
   now.set(Calendar.MONTH, month);

return now.getActualMaximum(Calendar.DATE);
}

/**
* 计算时间差
*
* @param beginTime
*            开始时间，格式：yyyy-MM-dd HH:mm:ss
* @param endTime
*            结束时间，格式：yyyy-MM-dd HH:mm:ss
* @return 从开始时间到结束时间之间的时间差（秒）
*/
public static long getTimeDifference(String beginTime, String endTime) {
  long between = 0;
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

   Date end = null;
   Date begin = null;
  try {// 将截取到的时间字符串转化为时间格式的字符串
    end = sdf.parse(endTime);
    begin = sdf.parse(beginTime);
   } catch (ParseException e) {
    e.printStackTrace();
   }

between = (end.getTime() - begin.getTime()) / 1000;// 除以1000是为了转换成秒

return between;
}

/**
* 计算时间差
*
* @param time
*            指定的时间，格式为：yyyy-MM-dd HH:mm:ss
* @return 当前时间和指定时间的时间差（秒）
*/
public static long getTimeDifference(String time) {
  long between = 0;
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   String systemTime = sdf.format(new Date()).toString();

   Date end = null;
   Date begin = null;
  try {// 将截取到的时间字符串转化为时间格式的字符串
    end = sdf.parse(time);
    begin = sdf.parse(systemTime);
   } catch (ParseException e) {
    e.printStackTrace();
   }

between = Math.abs(end.getTime() - begin.getTime()) / 1000;// 除以1000是为了转换成秒

return between;
}