(Delphi ActiveX) Get Certificate Valid To/From Dates

Demonstrates how to get the certificate "valid from" and "valid to" dates.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
cert: TChilkatCert;
success: Integer;
ckdt: ICkDateTime;
dt: IDtObj;

begin
cert := TChilkatCert.Create(Self);

success := cert.LoadFromFile('qa_data/certs/testCert.cer');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Get the certificate valid-from date/time
ckdt := cert.GetValidFromDt();
// Get the local timestamp string.
Memo1.Lines.Add('Valid from: ' + ckdt.GetAsTimestamp(1));
// Valid from: 2017-03-17T19:00:00-05:00

// Now get the date/time as another object where we can get the individual numeric date parts.
dt := ckdt.GetDtObj(1);
Memo1.Lines.Add(IntToStr(dt.Day) + '/' + IntToStr(dt.Month) + '/' + IntToStr(dt.Year) + '  ' + IntToStr(dt.Hour)
     + ':' + IntToStr(dt.Minute));

// Get the certificate valid-to date/time
ckdt := cert.GetValidToDt();
Memo1.Lines.Add('Valid to: ' + ckdt.GetAsTimestamp(1));
// Valid to: 2020-03-18T18:59:59-05:00
dt := ckdt.GetDtObj(1);
Memo1.Lines.Add(IntToStr(dt.Day) + '/' + IntToStr(dt.Month) + '/' + IntToStr(dt.Year) + '  ' + IntToStr(dt.Hour)
     + ':' + IntToStr(dt.Minute));
end;