Use the merge tag {today} in a field to output today’s current date on a form.

See the example of the One Wealth Management Risk Tolerance Assessment form here:

The {today} merge tag’s default output is the current date, but with the addition of the :format merge tag modifier, you can output the current time in various formats.

Full Gravity Forms help article: https://gravitywiz.com/current-time-merge-tags-in-gravity-forms/