(a) This section states how to compute a period of time prescribed or allowed by this title, by any order of the agency, or by any applicable statute. The day of the act, event, or default after which the designated period of time begins to run is not included. The last day of the period is included. However, if the last day of the time period would be a Saturday, a Sunday, or a legal holiday, the period is extended until the next day that is not a Saturday, a Sunday, or a legal holiday. A legal holiday, for purposes of this section, is any day other than a Saturday or Sunday that the agency is closed for a holiday established by state law.
(b) A time period described by statute or this title to be a certain number of business days is calculated under subsection (a) of this section without including any Saturday, Sunday, or legal holiday within that time period.
(c) A document required to be filed or served by a deadline established by statute or this title is filed or served when it is actually received. A document may be deemed to be filed or served when it is deposited with the United States Postal Service, properly addressed to the recipient, with all postage prepaid. The date of the postmark on the envelope for the document is presumed to be the date the document was deposited with the United States Postal Service.
(d) A document filed or served by delivery to the United States Postal Service is presumed to have been filed before 5:00 p.m. on the date indicated by the postmark.

Source Note: The provisions of this §6.9 adopted to be effective December 31, 1993, 18 TexReg 9707.