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Were you perhaps referring to the Submission Date in the form submission page?
Unfortunately, you cannot edit that as it is a hard coded data.
A workaround you can do to have your own custom Submission Date is to add a DateTime field in your form with the default date/time set to ON. And it also have date format.
See image below
You can also just hide the Date field in your form so that form respondent will not be able to see it. But in your form submissions you will be able to see the Date/Time the form was submitted.
A similar workaround was discuss on this thread. Hope this help in your requirement.
Please inform us if you need further assistance.