adding datetime tag to pipeline

[Pablo Rodríguez]

Dear list,

I have the following command:

gst-launch-1.0 autoaudiosrc ! audio/x-raw ! taginject
tags="title=Title,artist=\"Artist\",datetime=how" ! lamemp3enc !
id3v2mux ! filesink location=test.mp3

How can I add the info of "Gst.DateTime.new_now_local_time()" to the
datetime tag?

Excuse my very basic question, but I have no idea how to do it.

Many thanks for your help,

Pablo