OPINION OF THE COURT
Mahoney, P. J.The central issue presented by this appeal is the impact of the trial court’s rulings with respect to the testimony of the prosecution’s alibi rebuttal witnesses. The defendant, aided and abetted by another person, was charged with forcibly stealing property consisting of a wallet and its contents. On the date of her arraignment, August 6, 1979, the People served on the defendant a demand that if defendant intended to offer an alibi defense, she must “within eight days of service of such demand, serve upon the people * * * ‘notice of alibi,’ reciting (a) the place or places where the defendant claims to have been at the time in question, and *62(b) the names * * * of every such alibi witness upon whom he intends to rely” (CPL 250.20, subd 1). Pursuant to the statute, defendant had until August 14, 1979, viz., eight days, to serve the demanded “notice of alibi”. It was not served until September 19, 1979, 42 days after the date of demand. Defendant does not contend that she sought a court-authorized extension for good cause shown (CPL 250.20, subd 1). Despite the late compliance with the demand and the lack of authorization therefor, the People never moved against the “notice of alibi” or raised any objections when the witnesses identified in the “notice” testified at trial. It was the People’s contention at trial, repeated herein, that defendant’s tardy service of the required “notice” without court authorization relieved the People of its reciprocal duty of serving defendant or her counsel with a list of the witnesses the People proposed to offer in rebuttal to discredit defendant’s alibi at trial (CPL 250.20, subd 2). Accordingly, the People presented four such witnesses over defendant’s objections, and, further, the court, which permitted the rebuttal testimony, refused, upon application of defendant, to “grant an adjournment not in excess of three days” as required by the statute (CPL 250.20, subds 3, 4).
Without deciding whether the late filing of the “notice of alibi” by defendant excused the People from complying with its reciprocal statutory duty of serving a list of the rebuttal witnesses on defendant or her counsel, and without determining if the People’s conduct in not moving against the tardy notice and not objecting to the testimony of defendant’s alibi witnesses constituted a waiver of defendant’s statutory noncompliance, we conclude that the court erred in not granting an adjournment not exceeding three days when the People called its first rebuttal witness and defendant made the application permitted by the statute (CPL 250.20, subds 3, 4). This conclusion, in our view, is in keeping with the 1974 amendments to CPL 250.20 which were legislatively intended to correct the lack of reciprocity in the unamended alibi notice statute which was found to be unconstitutional by the United States Supreme Court (Wardius v Oregon, 412 US 470). The statute, as amended, permits the court to exclude either alibi testimony or re*63buttal proof, depending on whether the defendant or the People have failed to comply with the terms of the statute. In the alternative, the court may, in the exercise of its discretion, “receive such testimony, but before doing so, it must, upon application of the people [or the defendant], grant an adjournment not in excess of three days” (CPL 250.20, subd 3; emphasis added). As stated in Wardius v Oregon (supra, p 476), “It is fundamentally unfair to require a defendant to divulge the details of his own case while at the same time subjecting him to the hazard of surprise concerning refutation of the very pieces of evidence which he disclosed to the State”.
Since without the testimony of the People’s rebuttal witnesses proof of defendant’s guilt was not overwhelming in the face of the defendant’s alibi witnesses’ testimony (cf. People v Crimmins, 36 NY2d 230), the error of the trial court was not harmless. Having concluded that a new trial is necessary, we reach no other issue.
The judgment should be reversed, on the law, and a new trial ordered.