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You can use a text box for this scenario, and in case you might want to save the field as a custom field, you can find detailed steps on the process below:

To create a custom field

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"Select as Best" below if you find the answer a valid solution to your issue! 

I had used that previously, but I was hoping there was one that used a calendar or similar.

Thanks for confirming.

A calendar would be best, as those who complete the forms format dates in different ways, depending on their country of origin.