GregorianCalendar.IsLeapDay(Int32, Int32, Int32, Int32) 方法
定义
重要
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确定指定纪元中的指定日期是否为闰日。
public:
override bool IsLeapDay(int year, int month, int day, int era);public override bool IsLeapDay (int year, int month, int day, int era);override this.IsLeapDay : int * int * int * int -> boolPublic Overrides Function IsLeapDay (year As Integer, month As Integer, day As Integer, era As Integer) As Boolean参数
- year
- Int32
一个整数，用于表示年份。
- month
- Int32
1 到 12 之间的一个整数，用于表示月份。
- day
- Int32
1 到 31 之间的一个整数，用于表示天。
- era
- Int32
一个整数，用于表示纪元。
返回
如果指定的日期是闰日，则为 true；否则为 false。
例外
era 超出了日历支持的范围。
- 或 -
year 超出了日历支持的范围。
- 或 -
month 超出了日历支持的范围。
- 或 -
day 超出了日历支持的范围。
示例
下面的代码示例在每个纪元中调用第二个月的最后一天 (2 月) 5 年。
using namespace System;
using namespace System::Globalization;
int main()
{
// Creates and initializes a GregorianCalendar.
GregorianCalendar^ myCal = gcnew GregorianCalendar;
// Creates a holder for the last day of the second month (February).
int iLastDay;
// Displays the header.
Console::Write( "YEAR\t" );
for ( int y = 2001; y <= 2005; y++ )
Console::Write( "\t {0}", y );
Console::WriteLine();
// Checks five years in the current era.
Console::Write( "CurrentEra:" );
for ( int y = 2001; y <= 2005; y++ )
{
iLastDay = myCal->GetDaysInMonth( y, 2, GregorianCalendar::CurrentEra );
Console::Write( "\t {0}", myCal->IsLeapDay( y, 2, iLastDay, GregorianCalendar::CurrentEra ) );
}
Console::WriteLine();
// Checks five years in each of the eras.
for ( int i = 0; i < myCal->Eras->Length; i++ )
{
Console::Write( "Era {0}:\t", myCal->Eras[ i ] );
for ( int y = 2001; y <= 2005; y++ )
{
iLastDay = myCal->GetDaysInMonth( y, 2, myCal->Eras[ i ] );
Console::Write( "\t {0}", myCal->IsLeapDay( y, 2, iLastDay, myCal->Eras[ i ] ) );
}
Console::WriteLine();
}
}
/*
This code produces the following output.
YEAR 2001 2002 2003 2004 2005
CurrentEra: False False False True False
Era 1: False False False True False
*/
using System;
using System.Globalization;
public class SamplesGregorianCalendar {
public static void Main() {
// Creates and initializes a GregorianCalendar.
GregorianCalendar myCal = new GregorianCalendar();
// Creates a holder for the last day of the second month (February).
int iLastDay;
// Displays the header.
Console.Write( "YEAR\t" );
for ( int y = 2001; y <= 2005; y++ )
Console.Write( "\t{0}", y );
Console.WriteLine();
// Checks five years in the current era.
Console.Write( "CurrentEra:" );
for ( int y = 2001; y <= 2005; y++ ) {
iLastDay = myCal.GetDaysInMonth( y, 2, GregorianCalendar.CurrentEra );
Console.Write( "\t{0}", myCal.IsLeapDay( y, 2, iLastDay, GregorianCalendar.CurrentEra ) );
}
Console.WriteLine();
// Checks five years in each of the eras.
for ( int i = 0; i < myCal.Eras.Length; i++ ) {
Console.Write( "Era {0}:\t", myCal.Eras[i] );
for ( int y = 2001; y <= 2005; y++ ) {
iLastDay = myCal.GetDaysInMonth( y, 2, myCal.Eras[i] );
Console.Write( "\t{0}", myCal.IsLeapDay( y, 2, iLastDay, myCal.Eras[i] ) );
}
Console.WriteLine();
}
}
}
/*
This code produces the following output.
YEAR 2001 2002 2003 2004 2005
CurrentEra: False False False True False
Era 1: False False False True False
*/
Imports System.Globalization
Public Class SamplesGregorianCalendar
Public Shared Sub Main()
' Creates and initializes a GregorianCalendar.
Dim myCal As New GregorianCalendar()
' Creates a holder for the last day of the second month (February).
Dim iLastDay As Integer
' Displays the header.
Console.Write("YEAR" + ControlChars.Tab)
Dim y As Integer
For y = 2001 To 2005
Console.Write(ControlChars.Tab + "{0}", y)
Next y
Console.WriteLine()
' Checks five years in the current era.
Console.Write("CurrentEra:")
For y = 2001 To 2005
iLastDay = myCal.GetDaysInMonth(y, 2, GregorianCalendar.CurrentEra)
Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, GregorianCalendar.CurrentEra))
Next y
Console.WriteLine()
' Checks five years in each of the eras.
Dim i As Integer
For i = 0 To myCal.Eras.Length - 1
Console.Write("Era {0}:" + ControlChars.Tab, myCal.Eras(i))
For y = 2001 To 2005
iLastDay = myCal.GetDaysInMonth(y, 2, myCal.Eras(i))
Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, myCal.Eras(i)))
Next y
Console.WriteLine()
Next i
End Sub
End Class
'This code produces the following output.
'
'YEAR 2001 2002 2003 2004 2005
'CurrentEra: False False False True False
'Era 1: False False False True False
注解
公历中的闰年定义为可被 4 均匀地整除的年份，除非它可被 100 整除。 然而，被400整除的年份是闰年。 例如，1900 年不是闰年，而是 2000 年。 普通年份有 365 天，闰年有 366 天。
闰日是仅在闰年发生的一天。 在公历中，2 月的第 29 天是唯一的闰日。
