To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 22 Feb, 2018.
XML is !today -xml. XML is 2018-02-22T00:48:22.
Right now it is !today -t. Right now it is 22 Feb, 2018 00:48.
Tomorrow is !today +1. Tomorrow is 23 Feb, 2018.
Last week was !today -7. Last week was 15 Feb, 2018.
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.)