MS Access - set current date/time

[bigu2fan00]

Hello.

I know this is easy but I'm new to Access and can't figure this out. I would like a text box to display the current date/time and keep the time running, not just a snapshot. Is that possible? I tried to build an event with the expression builder. There, I found the current date/time. Even I knew it's coded as =Now() but that wouldn't work. I tried placing the =Now() on each property of the text box, on focus, on enter, on exit, after update, etc and none seemed to work for me. In the expression builder, I also tried clicking on the text box first then placing the =now() after that but that didn't work either.
What's the easiest way to do this? Can't I just do it through the expression builder?

Thanks.