Java 计算年月日和与年月日之间的天数

在平时开发中，我们经常会遇到计算时间的情况，通常用来判断过期时间，有效时间等，话不多说，上代码

  * 计算两个日期之间相差的整数,日期是××××年××月××日００时００分００秒 如果不足一个月按照一个月计算
  */
 public static int betweenMonth(Date begin, Date end) {
  Calendar begin= Calendar.getInstance();
  begingc.setTime(begin);
  int beginYear = begin.get(Calendar.YEAR);
  int beginMonth = begin.get(Calendar.MONTH);
  int beginDay = begin.get(Calendar.DAY_OF_MONTH);

  Calendar endTime= Calendar.getInstance();
  endTime.setTime(end);
  int endYear = endTime.get(Calendar.YEAR);
  int endMonth = endTime.get(Calendar.MONTH);
  int endDay = endTime.get(Calendar.DAY_OF_MONTH);

  int between = (endYear - beginYear) * 12 + (endMonth - beginMonth);

  if (endDay > beginDay)
   between = between + 1;
  else if (endDay < beginDay)
   between = between - 1;
  return between;

 }