Calendar.IsLeapYear Method (Int32)
.NET Framework 3.0
Determines whether the specified year in the current era is a leap year.
Namespace: System.Globalization
Assembly: mscorlib (in mscorlib.dll)
Assembly: mscorlib (in mscorlib.dll)
To make up for the difference between the calendar year and the actual time that the earth rotates around the sun or the actual time that the moon rotates around the earth, a leap year has a different number of days from a standard calendar year. Each Calendar implementation defines leap years differently.
The following code example compares different implementations of the Calendar class.
using namespace System; using namespace System::Globalization; int main() { // Creates an instance of every Calendar type. array<Calendar^>^myCals = gcnew array<Calendar^>(8); myCals[ 0 ] = gcnew GregorianCalendar; myCals[ 1 ] = gcnew HebrewCalendar; myCals[ 2 ] = gcnew HijriCalendar; myCals[ 3 ] = gcnew JapaneseCalendar; myCals[ 4 ] = gcnew JulianCalendar; myCals[ 5 ] = gcnew KoreanCalendar; myCals[ 6 ] = gcnew TaiwanCalendar; myCals[ 7 ] = gcnew ThaiBuddhistCalendar; // For each calendar, displays the current year, the number of months in that year, // and the number of days in each month of that year. int i; int j; int iYear; int iMonth; int iDay; DateTime myDT = DateTime::Today; for ( i = 0; i < myCals->Length; i++ ) { iYear = myCals[ i ]->GetYear( myDT ); Console::WriteLine(); Console::WriteLine( " {0}, Year: {1}", myCals[ i ]->GetType(), myCals[ i ]->GetYear( myDT ) ); Console::WriteLine( " MonthsInYear: {0}", myCals[ i ]->GetMonthsInYear( iYear ) ); Console::WriteLine( " DaysInYear: {0}", myCals[ i ]->GetDaysInYear( iYear ) ); Console::WriteLine( " Days in each month:" ); Console::Write( " " ); for ( j = 1; j <= myCals[ i ]->GetMonthsInYear( iYear ); j++ ) Console::Write( " {0, -5}", myCals[ i ]->GetDaysInMonth( iYear, j ) ); Console::WriteLine(); iMonth = myCals[ i ]->GetMonth( myDT ); iDay = myCals[ i ]->GetDayOfMonth( myDT ); Console::WriteLine( " IsLeapDay: {0}", myCals[ i ]->IsLeapDay( iYear, iMonth, iDay ) ); Console::WriteLine( " IsLeapMonth: {0}", myCals[ i ]->IsLeapMonth( iYear, iMonth ) ); Console::WriteLine( " IsLeapYear: {0}", myCals[ i ]->IsLeapYear( iYear ) ); } } /* This code produces the following output. The results vary depending on the date. System::Globalization::GregorianCalendar, Year: 2002 MonthsInYear: 12 DaysInYear: 365 Days in each month: 31 28 31 30 31 30 31 31 30 31 30 31 IsLeapDay: False IsLeapMonth: False IsLeapYear: False System::Globalization::HebrewCalendar, Year: 5763 MonthsInYear: 13 DaysInYear: 385 Days in each month: 30 30 30 29 30 30 29 30 29 30 29 30 29 IsLeapDay: False IsLeapMonth: False IsLeapYear: True System::Globalization::HijriCalendar, Year: 1423 MonthsInYear: 12 DaysInYear: 355 Days in each month: 30 29 30 29 30 29 30 29 30 29 30 30 IsLeapDay: False IsLeapMonth: False IsLeapYear: True System::Globalization::JapaneseCalendar, Year: 14 MonthsInYear: 12 DaysInYear: 365 Days in each month: 31 28 31 30 31 30 31 31 30 31 30 31 IsLeapDay: False IsLeapMonth: False IsLeapYear: False System::Globalization::JulianCalendar, Year: 2002 MonthsInYear: 12 DaysInYear: 365 Days in each month: 31 28 31 30 31 30 31 31 30 31 30 31 IsLeapDay: False IsLeapMonth: False IsLeapYear: False System::Globalization::KoreanCalendar, Year: 4335 MonthsInYear: 12 DaysInYear: 365 Days in each month: 31 28 31 30 31 30 31 31 30 31 30 31 IsLeapDay: False IsLeapMonth: False IsLeapYear: False System::Globalization::TaiwanCalendar, Year: 91 MonthsInYear: 12 DaysInYear: 365 Days in each month: 31 28 31 30 31 30 31 31 30 31 30 31 IsLeapDay: False IsLeapMonth: False IsLeapYear: False System::Globalization::ThaiBuddhistCalendar, Year: 2545 MonthsInYear: 12 DaysInYear: 365 Days in each month: 31 28 31 30 31 30 31 31 30 31 30 31 IsLeapDay: False IsLeapMonth: False IsLeapYear: False */
import System.* ;
import System.Globalization.* ;
public class SamplesCalendar
{
public static void main(String[] args)
{
// Creates an instance of every Calendar type.
Calendar myCals[] = new Calendar[8];
myCals[0] = new GregorianCalendar() ;
myCals[1] = new HebrewCalendar();
myCals[2] = new HijriCalendar();
myCals[3] = new JapaneseCalendar();
myCals[4] = new JulianCalendar() ;
myCals[5] = new KoreanCalendar() ;
myCals[6] = new TaiwanCalendar() ;
myCals[7] = new ThaiBuddhistCalendar() ;
// For each calendar, displays the current year, the number of months
// in that year, and the number of days in each month of that year.
int i, j, iYear, iMonth, iDay;
DateTime myDT = DateTime.get_Today();
for(i = 0;i < myCals.length;i++) {
iYear = myCals[i].GetYear(myDT);
Console.WriteLine();
Console.WriteLine("{0}, Year: {1}",
System.Convert.ToString(myCals[i].GetType()),
System.Convert.ToString(myCals[i].GetYear(myDT)));
Console.WriteLine(" MonthsInYear: {0}",
System.Convert.ToString(myCals [i].GetMonthsInYear(iYear)));
Console.WriteLine(" DaysInYear: {0}",
System.Convert.ToString( myCals[i].GetDaysInYear(iYear)));
Console.WriteLine(" Days in each month:");
Console.Write(" ");
for(j = 1;j <= myCals[i].GetMonthsInYear(iYear);j++) {
Console.Write(" {0,-5}",
System.Convert.ToString(myCals[i].GetDaysInMonth(iYear, j)));
}
Console.WriteLine();
iMonth = myCals[i].GetMonth(myDT);
iDay = myCals[i].GetDayOfMonth(myDT);
Console.WriteLine(" IsLeapDay: {0}",
System.Convert.ToString(myCals[i].IsLeapDay(iYear, iMonth, iDay)));
Console.WriteLine(" IsLeapMonth: {0}",
System.Convert.ToString(myCals[i].IsLeapMonth(iYear, iMonth)));
Console.WriteLine(" IsLeapYear: {0}",
System.Convert.ToString(myCals[i].IsLeapYear(iYear)));
}
} //main
} //SamplesCalendar
/*
System.Globalization.GregorianCalendar, Year: 2004
MonthsInYear: 12
DaysInYear: 366
Days in each month:
31 29 31 30 31 30 31 31 30 31 30 31
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: True
System.Globalization.HebrewCalendar, Year: 5764
MonthsInYear: 12
DaysInYear: 355
Days in each month:
30 30 30 29 30 29 30 29 30 29 30 29
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: False
System.Globalization.HijriCalendar, Year: 1425
MonthsInYear: 12
DaysInYear: 354
Days in each month:
30 29 30 29 30 29 30 29 30 29 30 29
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: False
System.Globalization.JapaneseCalendar, Year: 16
MonthsInYear: 12
DaysInYear: 366
Days in each month:
31 29 31 30 31 30 31 31 30 31 30 31
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: True
System.Globalization.JulianCalendar, Year: 2004
MonthsInYear: 12
DaysInYear: 366
Days in each month:
31 29 31 30 31 30 31 31 30 31 30 31
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: True
System.Globalization.KoreanCalendar, Year: 4337
MonthsInYear: 12
DaysInYear: 366
Days in each month:
31 29 31 30 31 30 31 31 30 31 30 31
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: True
System.Globalization.TaiwanCalendar, Year: 93
MonthsInYear: 12
DaysInYear: 366
Days in each month:
31 29 31 30 31 30 31 31 30 31 30 31
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: True
System.Globalization.ThaiBuddhistCalendar, Year: 2547
MonthsInYear: 12
DaysInYear: 366
Days in each month:
31 29 31 30 31 30 31 31 30 31 30 31
IsLeapDay: False
IsLeapMonth: False
IsLeapYear: True
*/
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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