delphi 是否是闰年- IsLeapYear、IsInLeapYear

SysUtils.IsLeapYear();
DateUtils.IsInLeapYear();

unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;

type  TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
end;

var  Form1: TForm1;
implementation
{$R *.dfm}
uses DateUtils;
procedure TForm1.FormCreate(Sender: TObject);
var  b: Boolean;begin 
b := IsLeapYear(2009); //False 
b := IsLeapYear(2012); //True 
b := IsInLeapYear(StrToDateTime('2009-1-1')); //False 
b := IsInLeapYear(StrToDateTime('2012-1-1')); //True// 
ShowMessage(BoolToStr(b, True));
end;
end.