To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 20 Oct, 2017.
XML is !today -xml. XML is 2017-10-20T21:37:51.
Right now it is !today -t. Right now it is 20 Oct, 2017 21:37.
Tomorrow is !today +1. Tomorrow is 21 Oct, 2017.
Last week was !today -7. Last week was 13 Oct, 2017.
The month is !today (MMM). The month is Oct.

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.)