To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 29 May, 2017.
XML is !today -xml. XML is 2017-05-29T18:59:48.
Right now it is !today -t. Right now it is 29 May, 2017 18:59.
Tomorrow is !today +1. Tomorrow is 30 May, 2017.
Last week was !today -7. Last week was 22 May, 2017.
The month is !today (MMM). The month is May.

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.)