Open form with data of current date (1 Viewer)

Hi,

I have simple form and want the two things:

1. When I click on Button "Set Today Rate" Then form will be opened and I can set Rates in fields. But if today Rates are already set then Program says "Rates are already set"

2. when I click on button "View Today Rates" then form will be opened with today Rates only. If rates are not set then show message the rates are not set yet for today.

How can I do it?

this code really helped me:
"[ServiceDate] = Date()"