To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 28 Jul, 2017.
XML is !today -xml. XML is 2017-07-28T08:47:14.
Right now it is !today -t. Right now it is 28 Jul, 2017 08:47.
Tomorrow is !today +1. Tomorrow is 29 Jul, 2017.
Last week was !today -7. Last week was 21 Jul, 2017.
The month is !today (MMM). The month is Jul.

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.)