JapaneseCalendar.IsLeapDay(Int32, Int32, Int32, Int32) JapaneseCalendar.IsLeapDay(Int32, Int32, Int32, Int32) JapaneseCalendar.IsLeapDay(Int32, Int32, Int32, Int32) JapaneseCalendar.IsLeapDay(Int32, Int32, Int32, Int32) Method

Definition

Determines whether the specified date in the specified era is a leap day.

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 -> bool
Public Overrides Function IsLeapDay (year As Integer, month As Integer, day As Integer, era As Integer) As Boolean

Parameters

year
Int32 Int32 Int32 Int32

An integer that represents the year.

month
Int32 Int32 Int32 Int32

An integer from 1 to 12 that represents the month.

day
Int32 Int32 Int32 Int32

An integer from 1 to 31 that represents the day.

era
Int32 Int32 Int32 Int32

An integer that represents the era.

Returns

true, if the specified day is a leap day; otherwise, false.

Exceptions

year is outside the range supported by the calendar.

-or-

month is outside the range supported by the calendar.

-or-

day is outside the range supported by the calendar.

-or-

era is outside the range supported by the calendar.

Examples

The following example calls IsLeapDay for the last day of the second month (February) for five years in each of the eras. The current era in the example output is the Reiwa era.


using namespace System;
using namespace System::Globalization;

int main()
{
   // Creates and initializes a JapaneseCalendar.
   JapaneseCalendar^ myCal = gcnew JapaneseCalendar;
   
   // Creates a holder for the last day of the second month (February)->
   int iLastDay;
   
   // Displays the header.
   Console::Write( "YEAR\t" );
   for ( int y = 1; y <= 5; y++ )
      Console::Write( "\t {0}", y );
   Console::WriteLine();
   
   // Checks five years in the current era.
   Console::Write( "CurrentEra:" );
   for ( int y = 1; y <= 5; y++ )
   {
      iLastDay = myCal->GetDaysInMonth( y, 2, JapaneseCalendar::CurrentEra );
      Console::Write( "\t {0}", myCal->IsLeapDay( y, 2, iLastDay, JapaneseCalendar::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 = 1; y <= 5; 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            1       2       3       4       5
CurrentEra:     False   True    False   False   False
Era 5:          False   True    False   False   False
Era 4:          False   False   False   True    False
Era 3:          False   False   True    False   False
Era 2:          True    False   False   False   True
Era 1:          True    False   False   False   True

*/
using System;
using System.Globalization;

public class SamplesJapaneseCalendar  
{
   public static void Main()  
   {
      // Creates and initializes a JapaneseCalendar.
      JapaneseCalendar myCal = new JapaneseCalendar();

      // Creates a holder for the last day of the second month (February).
      int iLastDay;

      // Displays the header.
      Console.Write( "YEAR\t" );
      for ( int y = 1; y <= 5; y++ )
         Console.Write( "\t{0}", y );
      Console.WriteLine();

      // Checks five years in the current era.
      Console.Write( "CurrentEra:" );
      for ( int y = 1; y <= 5; y++ )  {
         iLastDay = myCal.GetDaysInMonth( y, 2, JapaneseCalendar.CurrentEra );
         Console.Write( "\t{0}", myCal.IsLeapDay( y, 2, iLastDay, JapaneseCalendar.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 = 1; y <= 5; 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            1       2       3       4       5
CurrentEra:     False   True    False   False   False
Era 5:          False   True    False   False   False
Era 4:          False   False   False   True    False
Era 3:          False   False   True    False   False
Era 2:          True    False   False   False   True
Era 1:          True    False   False   False   True

*/
Imports System.Globalization

Public Class SamplesJapaneseCalendar   
   Public Shared Sub Main()
      ' Creates and initializes a JapaneseCalendar.
      Dim myCal As New JapaneseCalendar()

      ' 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 = 1 To 5
         Console.Write(ControlChars.Tab + "{0}", y)
      Next y
      Console.WriteLine()

      ' Checks five years in the current era.
      Console.Write("CurrentEra:")
      For y = 1 To 5
         iLastDay = myCal.GetDaysInMonth(y, 2, JapaneseCalendar.CurrentEra)
         Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, JapaneseCalendar.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 = 1 To 5
            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            1       2       3       4       5
'      CurrentEra:     False   True    False   False   False
'      Era 5:          False   True    False   False   False
'      Era 4:          False   False   False   True    False
'      Era 3:          False   False   True    False   False
'      Era 2:          True    False   False   False   True
'      Era 1:          True    False   False   False   True

Remarks

Leap years in the Japanese calendar correspond to the same leap years in the Gregorian calendar. A leap year in the Gregorian calendar is defined as a Gregorian year that is evenly divisible by four, except if it is divisible by 100. However, Gregorian years that are divisible by 400 are leap years. A common year has 365 days and a leap year has 366 days.

A leap day is a day that occurs only in a leap year. For example, the 29th day of Nigatsu (February) is the only leap day.

Applies to

See also