DelphiBasics
FileSetDate
Function
Set the last modified date and time of a file SysUtils unit
1  function FileSetDate ( FileHandle : Integer; FileAge : Integer ) : Integer;
2  function FileSetDate ( const FileName : string; FileAge : Integer ) : Integer;
Description
The SetFileDate function sets the last modified date and time of a file.
 
Version 1 of this function takes a FileHandle parameter to indicate the file. This requires use of the FileOpen function, which is one of the low level file handling routines in Delphi.
 
Version 2 of this function takes a FileName parameter to define the file.
 
The file is searched for in the current directory.
 
The second parameter, FileAge is an Integer date/time representation that is used to change the last modified date/time of the file.
 
Use the DateTimeToFileDate function to convert a TDateTime value to this integer format.
Related commands
DateTimeToFileDate Convert a TDateTime value to a File date/time format
FileAge Get the last modified date/time of a file without opening it
FileDateToDateTime Converts a file date/time format to a TDateTime value
FileGetAttr Gets the attributes of a file
FileSetAttr Sets the attributes of a file
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Example code : Display, update, and redisplay the last modified date of a file
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  SysUtils,   // Unit containing the FileSetDate command
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

var
  fileName    : string;
  fileDate    : Integer;
  newDateTime : TDateTime;

begin
  // Try to open the Unit1.DCU file for the current project
  fileName := 'Unit1.DCU';
  fileDate := FileAge(fileName);

  // Did we get the file age OK?
  if fileDate > -1 then
  begin
    ShowMessage(fileName+' last modified date = '+
                DateTimeToStr(FileDateToDateTime(fileDate)));

    // Now change the last modified date
    newDateTime := StrToDateTime('01/01/2000 12:34:56');
    FileSetDate(fileName, DateTimeToFileDate(newDateTime));
  end;

  // Did we update the file last modified date OK?
  fileDate := FileAge(fileName);
  if fileDate > -1 then
    ShowMessage(fileName+' last modified date = '+
                DateTimeToStr(FileDateToDateTime(fileDate)));
end;
 
end.
Hide full unit code
   Unit1.DCU last modified date = 30/10/2002 15:16:22
   Unit1.DCU last modified date = 01/01/2000 12:34:56
  
 
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