How can I add a timestamp to a monitored command (like "netstat") in Windows commandline?

Using netstat -aon | findstr /I "1234", I can monitor that this port is open, but there is an issue: this is what the result looks like:

UDP    0.0.0.0:1234    *:*     5064UDP    0.0.0.0:1234    *:*     5064UDP    0.0.0.0:1234    *:*     5064UDP    0.0.0.0:1234    *:*     5064

So, whenever my program (with Progress ID 5064) fails opening that port, I have no idea when this actually happens.

So, I would like something like:

while true:  netstat -aon | findstr /I "1234"  time /Tend

(I already checked netstat /?, but I don't find any switch which shows the timestamp.)

Does anybody have an idea?

(I'm working on Windows Server 2019.)