DecodeDate、DecodeTime ... DecodeDateTime ... 分解时间
SysUtils.DecodeDate();
SysUtils.DecodeDateFully();
SysUtils.DecodeTime();

DateUtils.DecodeDateTime();
DateUtils.DecodeDateDay();
DateUtils.DecodeDateWeek();
DateUtils.DecodeDateMonthWeek();
DateUtils.DecodeDayOfWeekInMonth();
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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
t: TDateTime;
Year, Month, Day, Week: Word;
Hour, Min, Sec, MSec: Word;
begin
t := EncodeDateTime(2009, 5, 21, 11, 22, 33, 999);

DecodeDate(t, Year, Month, Day);
ShowMessageFmt('%d,%d,%d', [Year, Month, Day]); //2009,5,21

DecodeDateFully(t, Year, Month, Day, Week);
ShowMessageFmt('%d,%d,%d,%d', [Year, Month, Day, Week]); //2009,5,21,5; 最后的 5 表示周四

DecodeTime(t, Hour, Min, Sec, MSec);
ShowMessageFmt('%d,%d,%d,%d', [Hour, Min, Sec, MSec]); //11,22,33,999

DecodeDateTime(t, Year, Month, Day, Hour, Min, Sec, MSec);
ShowMessageFmt('%d,%d,%d,%d,%d,%d,%d', [Year, Month, Day, Hour, Min, Sec, MSec]); //2009,5,21,11,22,33,999

DecodeDateDay(t, Year, Day);
ShowMessageFmt('%d,%d', [Year, Day]); //2009,141; 2009 年第 141 天

DecodeDateWeek(t, Year, Week, Day);
ShowMessageFmt('%d,%d,%d', [Year, Week, Day]); //2009,21,4; 2009 年第 21 周, 周 4

DecodeDateMonthWeek(t, Year, Month, Week, Day);
ShowMessageFmt('%d,%d,%d,%d', [Year, Month, Week, Day]); //2009,5,3,4; 2009 年 5 月的第 3 周, 周 4

DecodeDayOfWeekInMonth(t, Year, Month, Week, Day);
ShowMessageFmt('%d,%d,%d,%d', [Year, Month, Week, Day]); //2009,5,3,4
end;


end.