To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 25 Apr, 2017.
XML is !today -xml. XML is 2017-04-25T22:08:45.
Right now it is !today -t. Right now it is 25 Apr, 2017 22:08.
Tomorrow is !today +1. Tomorrow is 26 Apr, 2017.
Last week was !today -7. Last week was 18 Apr, 2017.
The month is !today (MMM). The month is Apr.

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.)