How to Calculate the AEDPA One-Year Habeas Deadline (Step by Step, With Examples)

A large share of federal habeas petitions that fail never fail on the merits. They fail because they arrived late. The judge never reaches the question of whether the trial was fair - the petition is dismissed as time-barred and that is usually the end of it.

So before you research claims, gather transcripts, or write a single paragraph, answer one question: how many days are left? Everything else follows from that number.

Under AEDPA, the one-year period usually runs from the date the conviction became final. Finality is not the day of sentencing and it is not the day the appeal was denied. It is the day direct review is completely over:

• State case, no certiorari petition filed: 90 days after the state's highest court denied the direct appeal (the time allowed to ask the U.S. Supreme Court to hear the case).
• State case, certiorari petition filed: the day the U.S. Supreme Court denies certiorari or decides the case.
• Federal case (§2255): 90 days after the court of appeals affirms, if no certiorari petition is filed - Clay v. United States, 537 U.S. 522 (2003).
• No appeal at all: when the time to file the direct appeal expired under state or federal rules.

There are alternative start dates - a newly recognized retroactive constitutional right, a state-created impediment that was removed, or newly discovered facts that could not have been found earlier with due diligence. Those are narrow and they are argued, not assumed. They appear at 28 U.S.C. §2244(d)(1)(B)-(D) for state cases and §2255(f)(2)-(4) for federal ones.

Pauses it (statutory tolling, state cases): a properly filed application for state post-conviction or other collateral review, under 28 U.S.C. §2244(d)(2). The clock stops the day it is filed and restarts the day the state process is finally resolved. "Properly filed" matters - a petition rejected as untimely under state law generally does not toll anything.

Important for federal cases: §2255 contains no statutory-tolling provision. A federal defendant's one-year clock is not paused the same way, so do not assume the state rule carries over.

Does not pause it: a pending federal habeas petition (Duncan v. Walker, 533 U.S. 167 (2001)), waiting on transcripts, looking for a lawyer, prison lockdowns by themselves, or a motion the state court treats as improperly filed.

Equitable tolling exists but it is rare. It requires showing you pursued the case diligently and that some extraordinary circumstance stood in the way - Holland v. Florida, 560 U.S. 631 (2010). Treat it as an argument of last resort, never as part of the plan.

Example 1 - simple state case. The state supreme court denies the direct appeal on March 1. No certiorari petition is filed. Finality is roughly May 30 (90 days later). The federal deadline is about May 30 of the following year. Nothing tolls it, so the full year runs straight through.

Example 2 - with state post-conviction. Same finality date of May 30. The petitioner files a state post-conviction petition 100 days later, on about September 7, with roughly 265 days left. The state case takes 14 months and ends the following November. The clock restarts then, and those 265 days run from that date - landing the federal deadline the following summer.

Example 3 - the trap. Same facts as Example 2, except the state petition is filed 13 months after finality. The federal year already expired, so there is nothing left to toll. Filing a late state petition does not revive a federal deadline that has already run.

These are illustrations of the arithmetic, not legal advice on any specific case. Court rules, mailbox-rule dates, and state-specific quirks can move these dates.

Collect four dates before you calculate anything:

1. The date the highest state court (or court of appeals) ruled on direct appeal.
2. Whether a certiorari petition was filed, and the date it was decided.
3. The filing date of any state post-conviction petition.
4. The date that state post-conviction case was finally resolved.

Then add 90 days where it applies, count forward one year, and add back any days the state case was pending. If the result is close - inside 90 days - treat it as urgent and get the petition on file rather than perfecting it.

Our free AEDPA deadline calculator walks through these same steps and shows the arithmetic, and the rules library has the underlying statutes in plain English.

It is not automatically over, but the options narrow sharply: equitable tolling (Holland v. Florida), an actual-innocence gateway based on new reliable evidence (McQuiggin v. Perkins, 569 U.S. 383 (2013)), or an alternative start date under the statute. Each of those has to be pleaded up front, in the petition, with facts - a judge will not build the argument for you.

If you are unsure whether the clock has run, calculate it anyway. Knowing you are two months late changes what you file; not knowing changes nothing.