RecodeDateTime、RecodeDate、RecodeTime、RecodeYear ... 修改时间

DateUtils.RecodeDateTime();
DateUtils.RecodeDate();
DateUtils.RecodeTime();
DateUtils.RecodeYear();
DateUtils.RecodeMonth();
DateUtils.RecodeDay();
DateUtils.RecodeHour();
DateUtils.RecodeMinute();
DateUtils.RecodeSecond();
DateUtils.RecodeMilliSecond();
DateUtils.TryRecodeDateTime();

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);
const
  st = 'yyyy-m-d h:n:s:z';
var
  t1, t2: TDateTime;
begin
  t1 := EncodeDateTime(2001, 1, 1, 1, 1, 1, 1);

  t2 := RecodeDateTime(t1, 2009, 5, 21, 11, 22, 33, 999);
  ShowMessage(FormatDateTime(st, t2));   //2009-5-21 11:22:33:999

  t2 := RecodeDate(t1, 2009, 5, 21);
  ShowMessage(FormatDateTime(st, t2));   //2009-5-21 1:1:1:1

  t2 := RecodeTime(t1, 11, 22, 33, 999);
  ShowMessage(FormatDateTime(st, t2));   //2009-1-1 11:22:33:999

  t2 := RecodeYear(t1, 2009);
  ShowMessage(FormatDateTime(st, t2));   //2009-1-1 1:1:1:1

  t2 := RecodeMonth(t1, 5);
  ShowMessage(FormatDateTime(st, t2));   //2001-5-1 1:1:1:1

  t2 := RecodeDay(t1, 21);
  ShowMessage(FormatDateTime(st, t2));   //2001-1-21 1:1:1:1

  t2 := RecodeHour(t1, 11);
  ShowMessage(FormatDateTime(st, t2));   //2001-1-1 11:1:1:1

  t2 := RecodeMinute(t1, 22);
  ShowMessage(FormatDateTime(st, t2));   //2001-1-1 1:22:1:1

  t2 := RecodeSecond(t1, 33);
  ShowMessage(FormatDateTime(st, t2));   //2001-1-1 1:1:33:1

  t2 := RecodeMilliSecond(t1, 999);
  ShowMessage(FormatDateTime(st, t2));   //2001-1-1 1:1:1:999

  if TryRecodeDateTime(t1, 2009, 5, 21, 11, 22, 33, 999, t2) then
    ShowMessage(FormatDateTime(st, t2));   //2009-5-21 11:22:33:999
end;

end.

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DateUtils-Function

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