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uses
  Registry;

// Write TDateTime to Registry
procedure Reg_WriteDateTime(dwRootKey: DWord; const sKey: string; const sField: string; aDate: TDateTime);
begin
  with TRegistry.Create do
  try
    RootKey := dwRootKey;
    if OpenKey(sKey, True) then
    begin
      try
        WriteBinaryData(sField, aDate, SizeOf(aDate));
      finally
        CloseKey;
      end;
    end;
  finally
    Free;
  end;
end;

// Read TDateTime from Registry
function Reg_ReadDateTime(dwRootKey: DWord; const sKey: string; const sField: string) : TDateTime;
begin
  Result := 0; // default Return value
  with TRegistry.Create do
  begin
    RootKey := dwRootKey;
    if OpenKey(sKey, False) then
    begin
      try
        ReadBinaryData(sField, Result, SizeOf(Result));
      finally
        CloseKey;
      end;
    end;
    Free;
  end;
end;

// Example:

// Write DateTimePicker1's DateTime to Registry
procedure TForm1.Button1Click(Sender: TObject);
begin
   Reg_WriteDateTime(HKEY_CURRENT_USER, 'Software\TestXYZ\','DateTime',DateTimePicker1.DateTime);
end;

// Set DateTimePicker1's DateTime from Registry
procedure TForm1.Button2Click(Sender: TObject);
var
 ATime: TDateTime;
begin
  ATime := Reg_ReadDateTime(HKEY_CURRENT_USER, 'Software\TestXYZ\','DateTime');
  if ATime <> 0 then
    DateTimePicker1.DateTime := TDateTime(ATime);
end;