This simple user macro renders current timestamp on the page (please note that it uses server's time)
Online demo
Sat May 11 10:06:56 EEST 2024
User macro code
## @noparams $content.currentDate
Full configuration
Also you can extend this to print out date and time using formatting options you have configured in your Confluence
$action.dateFormatter.formatDateTime($content.currentDate)
May 11, 2024 10:06