DateTime.IsLeapYear(Int32) メソッド

定義

名前空間:
System
アセンブリ:
System.Runtime.dll
アセンブリ:
mscorlib.dll, System.Runtime.dll
アセンブリ:
mscorlib.dll
アセンブリ:
netstandard.dll

指定された年が閏年かどうかを示す値を返します。Returns an indication whether the specified year is a leap year.

public:
 static bool IsLeapYear(int year);
public static bool IsLeapYear (int year);
static member IsLeapYear : int -> bool
Public Shared Function IsLeapYear (year As Integer) As Boolean

パラメーター

year
Int32

4 桁の年。A 4-digit year.

戻り値

Boolean

true が閏年である場合は year。それ以外の場合は false。true if year is a leap year; otherwise, false.

例外

ArgumentOutOfRangeException

year が 1 未満であるか、または 9999 を超えています。year is less than 1 or greater than 9999.

例

次の例では、メソッドを使用して、 IsLeapYear 1994 と2014の間の年数が閏年かどうかを確認します。The following example uses the IsLeapYear method to determine which years between 1994 and 2014 are leap years. また、この例では、メソッドを使用して閏年に年を追加した場合の結果も示してい AddYears ます。The example also illustrates the result when the AddYears method is used to add a year to a leap day.

using System;

public class IsLeapYear
{
   public static void Main()
   {
      for (int year = 1994; year <= 2014; year++)
      {
         if (DateTime.IsLeapYear(year))
         {
            Console.WriteLine("{0} is a leap year.", year);
            DateTime leapDay = new DateTime(year, 2, 29);
            DateTime nextYear = leapDay.AddYears(1);
            Console.WriteLine("   One year from {0} is {1}.",
                              leapDay.ToString("d"),
                              nextYear.ToString("d"));
         }
      }
   }
}
// The example produces the following output:
//       1996 is a leap year.
//          One year from 2/29/1996 is 2/28/1997.
//       2000 is a leap year.
//          One year from 2/29/2000 is 2/28/2001.
//       2004 is a leap year.
//          One year from 2/29/2004 is 2/28/2005.
//       2008 is a leap year.
//          One year from 2/29/2008 is 2/28/2009.
//       2012 is a leap year.
//          One year from 2/29/2012 is 2/28/2013.

Module IsLeapYear
   Public Sub Main()
      For year As Integer = 1994 to 2014
         If DateTime.IsLeapYear(year) Then
            Console.WriteLine("{0} is a leap year.", year)
            Dim leapDay As New Date(year, 2, 29)
            Dim nextYear As Date = leapDay.AddYears(1)
            Console.WriteLine("   One year from {0} is {1}.", _
                              leapDay.ToString("d"), _
                              nextYear.ToString("d"))
         End If
      Next
   End Sub
End Module
' The example displays the following output:
'       1996 is a leap year.
'          One year from 2/29/1996 is 2/28/1997.
'       2000 is a leap year.
'          One year from 2/29/2000 is 2/28/2001.
'       2004 is a leap year.
'          One year from 2/29/2004 is 2/28/2005.
'       2008 is a leap year.
'          One year from 2/29/2008 is 2/28/2009.
'       2012 is a leap year.
'          One year from 2/29/2012 is 2/28/2013.

注釈

year 4桁の10進数として指定します。たとえば、1996のようになります。year is specified as a 4-digit base 10 number; for example, 1996.

year は、常にグレゴリオ暦で年として解釈されます。year is always interpreted as a year in the Gregorian calendar. 特定の年が他の暦で閏年であるかどうかを確認するには、その calendar オブジェクトのメソッドを呼び出し IsLeapYear ます。To determine whether a particular year was a leap year in some other calendar, call that calendar object's IsLeapYear method.

適用対象