如何以编程方式在android中获取从一个月开始到现在的经过时间

3 回答

• 0

  您可以使用 calendar.set(year,month,1,0,0,0); 获取该月第一天的时间戳 .

  Calendar calendar = Calendar.getInstance();
  Date d = new Date(1544371200000L); //12/10/2018
  calendar.setTime(d);     
  int year = calendar.get(Calendar.YEAR);
  int month = calendar.get(Calendar.MONTH);
  calendar.set(year,month,1,0,0,0);
  Date firstDayOfMonth = calendar.getTime();
  long duration = d.getTime() - firstDayOfMonth.getTime();
  

  回复于 2024-04-25T20:08:53+08:00
• 2

  是你创建一个新日历并填充它的问题？您可以创建一个空的，只需填充您感兴趣的字段 .

  Calendar now = Calendar.getInstance();
  
    Calendar startOfMonth = new GregorianCalendar();
      calendar.set(Calendar.DAY_OF_MONTH, 1); //first day of month
      calendar.set(Calendar.MONTH, now.get(Calendar.MONTH));
      calendar.set(Calendar.YEAR,  now.get(Calendar.YEAR);
  
    timeElapsed = now.getTimeInMillis() -  startOfMonth.getTimeInMillis() ;
  

  回复于 2024-04-25T20:08:53+08:00
• 0

  要检索月初：

  val cal = Calendar.getInstance()
  cal.set(Calendar.HOUR_OF_DAY, 0)
  cal.clear(Calendar.MINUTE)
  cal.clear(Calendar.SECOND)
  cal.clear(Calendar.MILLISECOND)
  cal.set(Calendar.DAY_OF_MONTH, 1)
  

  然后计算以毫秒为单位的经过时间：

  val current = Calendar.getInstance()
  val timePassedMilliseconds=current.timeInMillis-cal.timeInMillis
  

  回复于 2024-04-25T20:08:53+08:00