To display the current date and/or time, you can use $smarty.now, which provides a UNIX TIMESTAMP. The date and time can be formatted using the Smarty modifier date_format;

$smarty.now

{{$smarty.now}} 1678791078
{{$smarty.now|date_format:"%d-%m-%Y"}} 14-03-2023
{{$smarty.now|date_format:"%d-%m-%Y %T"}} 14-03-2023 11:51:18
{{$smarty.now|date_format:"%m/%d/%Y"}} 03/14/2023