DateTime.IsLeapYear(Int32) 方法

定義

傳回指定年份是否為閏年的指示。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

參數

year
Int32

4 位數的年份。A 4-digit year.

傳回

true 是閏年時為 year,否則為 falsetrue if year is a leap year; otherwise, false.

例外狀況

year 小於 1 或大於 9999。year is less than 1 or greater than 9999.

範例

下列範例會使用 IsLeapYear 方法來判斷1994和2014之間的年份是閏年。The following example uses the IsLeapYear method to determine which years between 1994 and 2014 are leap years. 此範例也會說明使用 AddYears 方法將一年新增到閏日時的結果。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.

備註

year 指定為4位數的基底10數位;例如,1996。year is specified as a 4-digit base 10 number; for example, 1996.

year 一律會被視為西曆中的年份。year is always interpreted as a year in the Gregorian calendar. 若要判斷特定年份是否為某個其他行事曆中的閏年,請呼叫該行事曆物件的 IsLeapYear 方法。To determine whether a particular year was a leap year in some other calendar, call that calendar object's IsLeapYear method.

適用於