//. unit DateUtils
function IncMinute(const AValue: TDateTime;
const ANumberOfMinutes: Int64 = 1): TDateTime;
//. Exemple:
...
var dTime: Double; //. or TDateTime
begin
...
dTime:= Now; //. or any value
dTime:= IncMinute(5 {or any Int64 value});
//. display your time
statusbar1.Panels[1].Text:='Prochaine actualisation automatique: '+TimeToStr(dTime);
(* statusbar1.Panels[1].Text:= Format('%s: %s', ['Prochaine actualisation automatique', FormatDateTime('HH:MM:SS', dTime)]);
...
end;