To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 13 Dec, 2017.
XML is !today -xml. XML is 2017-12-13T03:34:23.
Right now it is !today -t. Right now it is 13 Dec, 2017 03:34.
Tomorrow is !today +1. Tomorrow is 14 Dec, 2017.
Last week was !today -7. Last week was 06 Dec, 2017.
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.)