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  1. import java.util.Calendar;
  2. import java.util.Date;
  3.  
  4. class Test {
  5.  
  6. 	public static void main(String args[]){
  7.  
  8.  
  9.     	Calendar cal1 = Calendar.getInstance();
  10.     	cal1.set(2014, 0, 1);
  11.     	Date dateFrom = cal1.getTime();
  12.     	Calendar cal2 = Calendar.getInstance();
  13.     	cal2.set(2014, 0, 2);
  14.     	Date dateTo   = cal2.getTime();
  15.     	int result = diffDays(dateFrom, dateTo);
  16.     	System.out.println(result);
  17. 	}
  18. 	/**
  19. 	 * 日付の差分日数を取得.
  20. 	 *
  21. 	 * 参考: http://j...content-available-to-author-only...y.net/java/date-diff-days/
  22. 	 *     : http://s...content-available-to-author-only...2.com/blog-entry-88.html
  23. 	 * @param dateFrom 開始日付
  24. 	 * @param dateTo   終了日付
  25. 	 * @return int 差分日数
  26. 	 */
  27. 	public static int diffDays(Date dateFrom, Date dateTo){
  28. 		// 日付をlong値に変換
  29. 		long dateTimeFrom = dateFrom.getTime();
  30. 		long dateTimeTo   = dateTo.getTime();
  31. 	    // 差分の日数を計算
  32. 		final int DAY_MILLISECONDS = (1000 * 60 * 60 * 24 );
  33. 		int diff = (int)( dateTimeTo - dateTimeFrom );
  34. 	    int dayDiff = diff / DAY_MILLISECONDS;
  35.  
  36. 	    return dayDiff;
  37. 	}
  38.  
  39. }
  40.  
Success #stdin #stdout 0.07s 380480KB
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https://ideone.com/5xVkrZ
language:
Java (12.0.1)
created:
9 years ago
visibility:
public

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