If you need to ask your applicants to enter a specific date, it is convenient for them to be presented with a mini-calendar where they can pick their date of choice. If you employ a Date Field, you can run reports based on those dates as well.

To add a date field to the submission form, click Date from the left side panel of the form builder.

In addition the default settings that come with all fields, the Date field allows you to specify a date range that the applicant choose from. Meaning, you can prevent the applicant from choosing a date prior to January 1st, 2000 if you if preferred, or no later than September 1st, 2020. If you do not want to specify a range, just leave those fields blank.
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This is how the field works for the end user.