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Unfortunately, it is currently not possible to enable a form on a particular starting date. It is only possible to disable the form on a specific date. How to limit submissions in a form.
I will raise this as a feature request to our backend team. However we cannot inform you if or when this request will be implemented. We will let you know on this thread once we have an update on your request.
In the meantime, a possible workaround I can suggest would be to add a date field and set the Default Date as the Current Date.
Then add a Form Collapse on top of all the fields except the date.
Finally, add a Show/Hide condition so that if the date is equal to the date 2016-08-18, then the fields will be shown.