DateTime.IsLeapYear(Int32) 方法

定义

返回指定的年份是否为闰年的指示。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

参数

year
Int32

四位数年份。A 4-digit year.

返回

如果 true 是闰年,则为 year;否则为 falsetrue if year is a leap year; otherwise, false.

异常

year 小于 1 或大于 9999。year is less than 1 or greater than 9999.

示例

下面的示例使用 IsLeapYear 方法来确定1994和2014之间的年份是闰年。The following example uses the IsLeapYear method to determine which years between 1994 and 2014 are leap years. 该示例还说明了使用 AddYears 方法将年份添加到闰日时的结果。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.

注解

year 指定为四位数基数为10的数字;例如,1996。year is specified as a 4-digit base 10 number; for example, 1996.

在公历中,year 始终解释为年份。year is always interpreted as a year in the Gregorian calendar. 若要确定某一年份是否为其他日历中的闰年,请调用该日历对象的 IsLeapYear 方法。To determine whether a particular year was a leap year in some other calendar, call that calendar object's IsLeapYear method.

适用于