uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,DateUtils;
...
//获取文件的创建时间
function GetFileCreationTime(const FileName: String): TDateTime;
var
  FileTime: TFileTime;
  LocalFileTime: TFileTime;
  hFile: THandle;
  SystemTime: TSystemTime;
begin
  Result := 0;
  FileTime.dwLowDateTime := 0;
  FileTime.dwHighDateTime := 0;
  hFile := FileOpen(FileName, fmShareDenyNone);
  try
    if hFile <> 0 then
    begin
      Windows.GetFileTime(hFile, @FileTime, nil, nil);
      FileTimeToLocalFileTime(FileTime, LocalFileTime);
      FileTime := LocalFileTime;
    end;
  finally
    FileClose(hFile);
  end;
  if FileTimeToSystemTime(FileTime, SystemTime) then
    Result := SystemTimeToDateTime(SystemTime);
end;
 
//获取文件的修改时间
function GetFileEditTime(const FileName: String): TDateTime;
var
  FileTime: TFileTime;
  LocalFileTime: TFileTime;
  hFile: THandle;
  SystemTime: TSystemTime;
begin
  Result := 0;
  FileTime.dwLowDateTime := 0;
  FileTime.dwHighDateTime := 0;
  hFile := FileOpen(FileName, fmShareDenyNone);
  try
    if hFile <> 0 then
    begin
      Windows.GetFileTime(hFile, nil, nil, @FileTime);
      FileTimeToLocalFileTime(FileTime, LocalFileTime);
      FileTime := LocalFileTime;
    end;
  finally
    FileClose(hFile);
  end;
  if FileTimeToSystemTime(FileTime, SystemTime) then
    Result := SystemTimeToDateTime(SystemTime);
end;
 
调用：
edit1.text:=datetimetostr( GetFileEditTime('E:\test\D12000398C1.csv'));
 
获取文件夹下的所有文件名称、按文件的修改时间删除指定的文件
procedure TForm1.Button2Click(Sender: TObject);
var
   r:TsearchRec;
   filelist:Tstringlist;
   i:integer;
begin
    filelist:=Tstringlist.create;
    if findfirst('e:\test\'+'*.csv',faanyfile,r)=0 then filelist.add(r.name);
    while findnext(r)=0 do
    filelist.add(r.name);
    findclose(r);
    //这样filelist中就保存了你输入的文件夹下的所有文件，我下面显示在一个memo组件中了
    for i:=0 to filelist.count-1 do
    begin
      if hoursBetween(GetFileEditTime('E:\test\'+filelist[i]),Now)>48  then
         begin
            try
            deletefile('E:\test\'+filelist[i]);
            except
            end;
         end;
       //memo1.lines.text:=memo1.lines.text+filelist[i]+#13;
    end;
    filelist.free;
end;