To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 28 Feb, 2017.
XML is !today -xml. XML is 2017-02-28T12:46:05.
Right now it is !today -t. Right now it is 28 Feb, 2017 12:46.
Tomorrow is !today +1. Tomorrow is 01 Mar, 2017.
Last week was !today -7. Last week was 21 Feb, 2017.
The month is !today (MMM). The month is Feb.

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.)