How to fetch date data from completed form

How to fetch date data from completed form

Hi

I am very new to this software, and would appreciate some advise

I am building an application to log maintenance on a variety of hydraulic and mechanical equipment.  I have created the forms, that include all required information fields, including the date that the work was completed.

What I would like to do is have a field on the form, that will automatically fill with the date that the last maintenance was completed on.  I think the fetch data is how I need to do this, but I am pretty lost trying to work it out

With no experience in code or variable strings, I have not been able to find any help online

Any assistance or solution will be greatly appreciated

Thanks

Scott