delivered the opinion of the Court.
*293 This сase is before us on the following certificate from the Court of Civil Appeals at Fort Worth:
“On May 15, 1959, this Court affirmеd the judgment of the trial court on an appeal by Willie C. Smith from a judgment sustaining a plea in abatement filed by appellee Harris County-Houston Ship Channel Navigation District.
“On May 30, 1959, appellant Smith properly postеd in the United States mails his motion for rehearing, which was received by the Clerk of this Court on June 1, 1959. We directed the Clеrk not to file the motion because we held that it came too late.
“According to the provisions оf Rule 458, T.R.C.P., a motion for rehearing must be filed within fifteen days after the rendition of the judgment. Rule 5 provides that a motiоn for rehearing shall be deemed to have been filed in time if it is properly addressed and stamped and dеposited in the mail one day before the last day for filing same. Rule 4 provides that the last day of the pеriod so computed is to be included, unless it is a Sunday or a legal holiday, in which event the period shall run until the еnd of the next day which is neither a Sunday nor a holiday.
“Your Honors held in Blackman v. Housing Authority of City of Dallas,152 Texas 21 ,254 S.W. 2d 103 , that Monday, March 3, was not to be included in the time ‘so computed,’ since the Act of May 22, 1947, 50th Leg., Reg. Sess., Article 4591d, p. 424, ch. 230, рrovided that when legal holidays fall on Sunday, the Monday next following is declared to be a legal holiday. Appellant insists that the holding in the cited case is conclusive here, and shows our action to be erroneous. We understand his contention to be that May 30 is a legal holiday, or at least is one of those days ‘which, though not thus “legal” holidays, are yet recognized by legislative declaration as being general holidays by pоpular acceptance.’ Since May 30, 1959, was followed by a Sunday, it is anpellant’s position that Monday, June 1, was the last day for filing the motion.
“We notice that the statute which was construed by Your Honors in Blackman v. Housing Authority of City of Dallas, supra, added May 30 to the list of legal holidays. It appears that such date is not retаined in the amended statute, which is now Article 459Id. We therefore think that such date is not now a legal holiday, and that there is no legislative declaration that it is a holiday by popular acceptance. For these reasons *294 we held that appellant’s motion for rehearing was not posted one day before the last day for filing.
“The appellant feels that he cannot reach the Supreme Court by appliсation for writ of error unless and until his motion for rehearing is filed; and in deference to that opinion, and because the issue involves a matter of extreme importance, we certify to your Honorable Court the following question:
“Was appellant’s motion for rehearing timely deposited in the mails?”
As pointed out by the Court of Civil Appeals, we stated in Blackman v. Housing Authority of City of Dallas,
Article 4591d has been amended twicе since the Blackman case was decided. Banks and trust companies are now authorized, at their оption, to close for general banking purposes on Saturday or any other weekday designated аs provided therein, and such day is thereupon treated as Sunday and not a business day. Subject to these prоvisions, only Sundays and six of thé *295 dates enumerated in Article 4591 are declared to be legal holidays for banking purposes. May 30 is not mentioned in either Article 4591 or Article 4591d, and there is no existing legislative declaration that the same is commonly observed as a holiday. The application of Rule 4 as interpreted in the Blackman case was reasonably certain in the light of the statutes then in force, but this will not be true if such interpretation is now extended to include any day in the year which has ever been recognized by the Legislature as a general holiday by popular acceptance. In our opinion, it would be unwise to go that far, and the question submitted by the Court of Civil Appeals is answered in the negative. Under our present statutes, only the days designated in Article 4591 are legal holidays within the meaning of Rule 4.
Opinion delivered December 9, 1959.
