This appeal requires us to determine whether a lawyer’s misunderstanding of unambiguous procedural rules can constitute “excusable neglect” under the standard set out by the Supreme Court in Pioneer Investment Services v. Brunswick Associates Ltd. Partnership,
I.
Plaintiff Advanced Estimating Services (“AES”) initiated the present action against Defendants Timothy Riney and Damon, Inc. (collectively referred to in the singular as “Riney”). The case went to trial on AES’ claims against Riney for copyright infringement, misappropriation of trade secrets, and breach of contract. The jury returned a verdict for AES on all three counts.
Riney filed untimely motions for a new trial and for relief from judgment. Believing that these motions were timely — thereby tolling the period for fifing a notice of appeal, see Fed.R.App.P. 4(a)(4), Riney failed to file a timely notice of appeal. (In their opposition to these post-trial motions, AES pointed out that the motions were untimely.) His notice of appeal, when filed, was about three weeks late.
Upon learning that his notice of appeal was late, Riney filed a motion for enlargement of time to file the notice of appeal in district court. But, before the district court ruled on the motion for more time, the ease reached this court. We remanded and the district court, using the “unique circumstance” standard, determined that no excusable neglect existed. We again remanded the ease to the district court; this time to consider the question of excusable neglect in the fight of Pioneer Investment Services v. Brunswick Asso-dates Ltd. Partnership,
II.
“The district court, upon a showing of excusable neglect or good cause, may extend the time for fifing a notice of appeal....” Fed.R.App.P. 4(a)(5). We review the district court’s determination of excusable neglect for abuse of discretion. AES I, 77 F.3d at 1325.
The “neglect” at issue in this case consists of Riney’s lawyer mistakenly believing that he had ten days from his receiving notice of the entry of the judgment to file his post-trial motions. Rule 59 of the Federal Rules of Civil Procedure provides that a party has ten days after the “entry” of judgment to file his motion for a new trial. See Fed.R.Civ.P. 59; AES I,
In Pioneer, the Court, interpreting Bankruptcy Rule 9006(b)(1),
Soon after Pioneer, it was established in this circuit that attorney error based on a misunderstanding of the law was an insufficient basis for excusing a failure to comply with a deadline. See, e.g., Cavaliere v. Allstate Ins. Co.,
Today, we follow the other circuits and hold, as a matter of law, that an attorney’s misunderstanding of the plain language of a rule cannot constitute excusable neglect such that a party is relieved of the consequences of failing to comply with a statutory deadline. Nothing in Pioneer indicates otherwise, and we believe that the law in this area remains as it was before Pioneer.
Riney argues that the issue has effectively been decided in his favor already; he points us to AES I. See
Riney also points the court to Cheney v. Anchor Glass Container Corp.,
Cheney was a miscommunieation case or a clerical-error case: a mistake of fact was made about whether a message was delivered. This case, however, is a mistake-of-law case; the reason for Riney’s failure to file timely a notice of appeal was an apparent failure to review or to appreciate the relevant rules, which clearly indicate that a party has ten days from the entry of judgment to file the kind of post-trial motions that will toll the filing period for a notice of appeal.
APPEAL DISMISSED.
Notes
. Rule 9006(b)(1) provides in pertinent part, “when an act is required or allowed to be done at or within a specified period by these rules or by a notice given thereunder or by order of the court, the court for cause shown may at any time in its discretion ... (2) on motion made after the expiration of the specific period permit the act to be done where the failure to act was the result of excusable neglect.”
. By the way, in Cheney the delay in filing the demand for trial was only six days — weeks shorter than the delay in this case.
. Furthermore, Cheney did not involve an issue of appellate jurisdiction. A timely filing of a notice of appeal is a mandatory prerequisite to the exercise of this Court’s jurisdiction. See Pinion v. Dow Chemical, U.S.A., 928 F.2d 1522 (11th Cir.1991).
. For background, see S.S. Peloubet, Legal Maxims 99-100, 262 (1985); Black's Law Dictionary 672, 673 (5th ed.1979).
. Because we must dismiss the appeal on jurisdictional grounds, we do not weigh the merits of the defendant-appellant’s case. Although it had no effect on today's decision, we do observe, in passing, that success on the merits seemed doubtful.
. Advanced Estimating’s appeals (numbers 96-5235 and 97-4125) are dismissed as moot.
