To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 19 Nov, 2017.
XML is !today -xml. XML is 2017-11-19T12:26:12.
Right now it is !today -t. Right now it is 19 Nov, 2017 12:26.
Tomorrow is !today +1. Tomorrow is 20 Nov, 2017.
Last week was !today -7. Last week was 12 Nov, 2017.
The month is !today (MMM). The month is Nov.

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.)