Yep, I figured out the issue now. Both of you gave the right information to solve the problem.

My first mistake was as Jacob mentioned, `date` is actually a dataframe object here. To get the string date, I had to do similar to what Amine suggested. See the screenshot here.But now I have a new problem: the date is shown as the key, rather than showing "max_end_revenue_date". This is what Amine pointed out.

From the documentation:

text(name: String, defaultValue: String, label: String): void -> Creates a text input widget with a given name and default value

I have a mistake in my code. The third argument is actually the label, which is what shows up in the UI. However, `name`, which is the first positional argument, is what we would use with `dbutils.widgets.get("name")` here.