What you are saying is right.
Softr process datetime values in gmt-0 (and this what you should have setup on your airtable date field)
You must add a new formula field next to your date field, and convert the value to your timezone.
This is not the case when using fillout.com forms, if you enter 1pm as value in your form, then 1pm will be set on your airtable date field.