To diplay todays date:

Markup Text
Displayed as
Today is !today. Today is 16 Jan, 2019.
XML is !today -xml. XML is 2019-01-16T12:58:28.
Right now it is !today -t. Right now it is 16 Jan, 2019 12:58.
Tomorrow is !today +1. Tomorrow is 17 Jan, 2019.
Last week was !today -7. Last week was 09 Jan, 2019.
The month is !today (MMM). The month is Jan.

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.)