To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 17 Dec, 2018.
XML is !today -xml. XML is 2018-12-17T20:37:09.
Right now it is !today -t. Right now it is 17 Dec, 2018 20:37.
Tomorrow is !today +1. Tomorrow is 18 Dec, 2018.
Last week was !today -7. Last week was 10 Dec, 2018.
The month is !today (MMM). The month is Dec.

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.)