To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 21 Jul, 2018.
XML is !today -xml. XML is 2018-07-21T07:52:11.
Right now it is !today -t. Right now it is 21 Jul, 2018 07:52.
Tomorrow is !today +1. Tomorrow is 22 Jul, 2018.
Last week was !today -7. Last week was 14 Jul, 2018.
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.)