Is there is easy method with less stress for the system to show the aktual time including seconds in the basic and classicUI?
It could be the now-value as digital-time and shows e.g. in the header.

There are no ways I know of to do it on a second by second basis in basic or classic ui.

Thanks, what a shame.
To read NTP every second and bild and send HTML-Code works, but isn’t a good solution.
I hoped, there would be a function to integrate a Java-Script in the HTML-Code.

You could use a webview to show an embedded clock.

Get a link from here:

My quick test ended up looking like this in OH:

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Webview was the keyword.
Only optional display (in the standard) in the headline would be increase.