java 计算两个日期中间有多少天

叁歲伎倆 2022-02-01 12:21 427阅读 0赞 
  1. //计算天数
  2.     public  int daysBetween(Date now, Date returnDate) {
  3.         Calendar cNow = Calendar.getInstance();
  4.         Calendar cReturnDate = Calendar.getInstance();
  5.         cNow.setTime(now);
  6.         cReturnDate.setTime(returnDate);
  7.         setTimeToMidnight(cNow);
  8.         setTimeToMidnight(cReturnDate);
  9.         long todayMs = cNow.getTimeInMillis();
  10.         long returnMs = cReturnDate.getTimeInMillis();
  11.         long intervalMs = todayMs - returnMs;
  12.         return millisecondsToDays(intervalMs);
  13.     }
  14.     public  void setTimeToMidnight(Calendar calendar) {
  15.         calendar.set(Calendar.HOUR_OF_DAY, 0);
  16.         calendar.set(Calendar.MINUTE, 0);
  17.         calendar.set(Calendar.SECOND, 0);
  18.     }
  19.     public  int millisecondsToDays(long intervalMs) {
  20.         return (int) (intervalMs / (1000 * 86400));
  21.     }

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