22 Tex. Admin. Code § 201.1
In computing any period of time prescribed or allowed by this chapter, by order of the agency, or by any applicable statute, the period shall begin on the day after the act, event, or default in controversy and conclude on the last day of such computed period, unless it be a Saturday, Sunday, or legal holiday, in which event the period runs until the end of the next day which is not a Saturday, Sunday, or legal holiday.
Source Note:The provisions of this §201.1 adopted to be effective April 5, 1976, 1 TexReg 694.