How can I determine the "filing date" for a document?

If a document is filed by mail, then the Authority will consider it filed on the date the document is postmarked. However, if there is no postmark on the envelope, then the Authority considers the document filed five days prior to receipt by the Authority. If the filing is deposited with a commercial delivery service that will provide a record showing the date the document was tendered to the delivery service, then it shall be considered filed on the date when the matter served is deposited with the comme