IsSameDay、IsToday - 判断是不是同一天、判断是不是今天

unit Unit1;



interface



uses

  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

  t1,t2,t3,t4: TDateTime;

  b: Boolean;

begin

  t1 := StrToDateTime('2009-1-21');

  t2 := StrToDateTime('2009-1-21');

  t3 := StrToDateTime('2009-5-21');

  t4 := Now;



  {判断是不是同一天}

  b := IsSameDay(t1, t2); //True

  b := IsSameDay(t1, t3); //False



  {判断给定时间和当前时间是不是同一天}

  b := IsToday(t1); //False

  b := IsToDay(t4); //True



//  ShowMessage(BoolToStr(b, True));

end;



end.