To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 24 Sep, 2017.
XML is !today -xml. XML is 2017-09-24T04:52:56.
Right now it is !today -t. Right now it is 24 Sep, 2017 04:52.
Tomorrow is !today +1. Tomorrow is 25 Sep, 2017.
Last week was !today -7. Last week was 17 Sep, 2017.
The month is !today (MMM). The month is Sep.

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.)