FitNesse. UserGuide.
TodaysDate [add child]
To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 01 Jun, 2025.
XML is !today -xml. XML is 2025-06-01T10:00:32.
Right now it is !today -t. Right now it is 01 Jun, 2025 10:00.
Tomorrow is !today +1. Tomorrow is 02 Jun, 2025.
Last week was !today -7. Last week was 25 May, 2025.
The month is !today (MMM). The month is Jun.

As you can see, you can add or subtract days. You can include the time tiwh -t. And you can use your own format for the time. (See SimpleDataFormat for the syntax.)