# DateTime.IsLeapYear(Int32) 方法

## 定義

``````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 `false``true` 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

``````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);
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.