Tex. R. Civ. P. 4
In computing any period of time prescribed or allowed by these rules, by order of court, 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 to be included. The last day of the period so computed is to be included, unless it is 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. Saturdays, Sundays, and legal holidays shall not be counted for any purpose in any time period of five days or less in these rules, except that Saturdays, Sundays, and legal holidays shall be counted for purpose of the three-day periods in Rules 21 and 21a, extending other periods by three days when service is made by mail.
Tex. R. Civ. P. 4
Notes and Comments
Comment to 1990 change: Amended to omit counting Saturdays, Sundays and legal holidays in all periods of less than five days with certain exceptions.