Within, By, and Not Later Than
Drafters choose between within fourteen days, by the fourteenth and not later than the fourteenth, and the choices are not equivalent. One counts a period, one names a date, and the third makes the named date inclusive in a way the second sometimes does not.
The rule in short
Within a period counts from a trigger and produces a date; by a date and not later than a date name one directly. The practical differences are whether the named day is included, whether the counting conventions apply at all, and what happens when the day falls on a closure. Reading which construction a rule uses settles a question that would otherwise be argued.
Three constructions do almost the same work, and the almost is a day. Where a period is generous the difference is invisible; where it is a week it is a third of the argument.
What each construction does
Within a period. Counts forward from a trigger, applies the computation rules, and produces a date that nobody stated in advance.
By a date. Names a day directly, which removes the trigger question entirely and usually removes the counting rules with it.
Not later than a date. Names a day and states expressly that the day itself is still available, which is the safest of the three to draft.
On or before. The same effect as not later than, and the phrasing most often used in commercial documents.
Before a date. Generally excludes the named day, so before the fourteenth means the thirteenth is the last available day.
No later than the close of business. Adds an hour to a named date, which is otherwise governed by the ordinary cut-off, per the last day and what time it ends.
Immediately or forthwith. Not a deadline at all in any computable sense, and the source of a different and less tractable kind of argument.
As soon as practicable. A standard rather than a date, judged against what the party could actually have done, and impossible to diarize.
Computed periods against named dates
A computed period needs a trigger. Within fourteen days is meaningless until the event it runs from is identified.
A named date needs nothing. By the fourteenth of the month is fixed whoever reads it and whenever they read it.
Counting rules apply to one, not the other. The exclusion of the first day is irrelevant to a date that was simply stated.
Closure adjustments may differ. A computed period whose last day is a Sunday moves; a named Sunday may or may not, and the instrument should say.
Named dates survive disputes about service. Where the trigger is contested, a stated date removes the argument entirely.
Computed periods survive changes in timing. Where a step happens late, a computed period gives the same amount of time regardless.
Orders frequently use both. Directions setting out several steps often name a date for one and a period for the next, which is worth reading carefully.
| Wording | Named day | Counting rules | Best used for |
|---|---|---|---|
| Within 14 days | Last day included | Apply | Periods from a trigger |
| By the 14th | Usually included | Usually not | Fixed dates |
| Not later than the 14th | Included | Usually not | Any drafted deadline |
| On or before the 14th | Included | Usually not | Commercial documents |
| Before the 14th | Excluded | Usually not | Rarely a good choice |
Whether the named day counts
Not later than includes it. The construction says so, which is why it is the clearest of the three.
By a date usually includes it. The ordinary reading is that the named day is available, though the point has been argued.
Before a date usually excludes it. Which makes before a poor choice for a deadline unless the exclusion is intended.
On or before removes the doubt. The phrasing exists precisely to answer the question in the text rather than in argument.
Within a period includes the last day. The computation rules include the final day of a computed period, which matches the ordinary expectation.
Local convention can settle it. Some instruments define these phrases, and where they do the definition governs everything else.
Draft the safe version. Anybody writing a deadline should use not later than or on or before, and remove the question from the document.
Where a document says before a date and defines nothing, the safe reading is that the named day is not available. Working to the preceding day costs nothing, and it removes the only version of this question that can actually make a filing late.
Where the distinction matters
Short windows. On a five-day period, one day is twenty percent of the time available and all of the margin.
Contractual notice clauses. Agreements use before and by loosely, and the resulting ambiguity surfaces only when somebody relies on the last day.
Payment terms. Payment by a date and payment before it are different obligations, and the difference is a day of interest or a default.
Backward periods. Not later than seven days before a hearing is a backward period with an inclusive edge, per deadlines that run backwards.
Statutory windows. Where a statute uses one construction and a rule uses another for the same step, the statute governs.
Correspondence granting time. A letter allowing somebody until a date should say not later than, because the recipient will read it generously.
Consent extensions. An agreed extension recorded as by the end of the month leaves the last day open to argument, per consent extensions between the parties.
A practical approach
Read which construction is used. It takes seconds, and it answers a question that would otherwise be answered by assumption.
Convert everything into a date. Whatever the wording, the file should record a specific day rather than a phrase to be interpreted later.
Treat before as the day earlier. Where a rule says before a date and nothing defines it, working to the preceding day is safe and costs nothing.
Use the clear phrasing when drafting. Not later than and on or before are unambiguous, and every other option invites a dispute.
Say what happens at a closure. A drafted deadline that names a date should say whether it moves if that day is a weekend.
Check whether an hour is stated. A named date without an hour takes the forum's ordinary cut-off, which may be earlier than expected.
Record the wording alongside the date. The phrase that produced a date is part of the calculation and belongs in the file beside it.
Read a granted extension the same way. An order allowing time until a date carries the same ambiguity as any other wording and deserves the same treatment.
Within, by and not later than do nearly the same work, and the nearly is one day, which is the whole margin on a short period.
Within counts a period from a trigger and brings the computation rules with it. By and not later than name a date directly and usually leave those rules behind.
The inclusive question is answered clearly by not later than and on or before, ambiguously by by, and unhelpfully by before, which normally excludes the day it names.
The difference surfaces in the same places every time: short windows, contractual notice clauses, payment terms and correspondence that grants somebody time without saying precisely how much.
The practical answers are to read which construction is used, to convert it into a specific date in the file, to treat before as the preceding day, and to draft with the unambiguous phrasings.
Points to carry away
- Within counts a period; by and not later than name a date.
- A named date is not computed and does not need a trigger.
- Not later than is generally inclusive of the named day.
- Before a date usually excludes the named day.
- The closure adjustment may not apply to a named date.
Questions readers ask
Is by a date the same as not later than that date?
In ordinary reading, yes: both are usually taken to include the named day. Not later than says so expressly, which is why it is the better drafting choice, while by has been argued about often enough that careful documents avoid it. The safest approach when reading a document that uses by is to treat the named day as available while planning to act earlier, and the safest approach when writing one is to use not later than or on or before instead.
Does before a date include that date?
Generally not. Before the fourteenth ordinarily means the thirteenth is the last day on which the step can be taken, which makes before an unfortunate choice for a deadline unless the exclusion is deliberate. Because the construction appears in contracts and correspondence where nobody intended that effect, the practical response when reading it is to work to the earlier day, and the practical response when drafting is to use a construction that says what it means.
Do the counting rules apply to a named date?
Usually not, because nothing is being computed. The exclusion of the first day, the calendar-against-business-days question and the added time for postal service all belong to periods measured from a trigger. What does remain uncertain with a named date is whether it moves when it falls on a weekend or a holiday, since the closure adjustment is written for computed periods. A well-drafted document that names a date says what happens if that day is not a working one.
Sources
- Federal Rules of Civil Procedure — Rule 6, Computing and Extending Timelaw.cornell.edu
- 1 U.S.C. 1 — Rules of Constructionlaw.cornell.edu
- Legal Information Institute — Computation of Timelaw.cornell.edu
- Federal Rules of Civil Procedure — Rule 16, Pretrial Conferences and Schedulinglaw.cornell.edu
- Uniform Commercial Code — Article 1, General Provisionslaw.cornell.edu
- Federal Rules of Appellate Procedure — Rule 26, Computing and Extending Timelaw.cornell.edu
Urban Justice Docket is a publication, not a law firm. This article states general rules and cites its sources; it is not advice about any particular case, and the law differs by state and changes over time.
More in Counting the Days
When the Clock Actually Starts Running
Every time limit has a trigger, and the trigger is defined by the rule rather than by common sense. Service, issue, receipt, demand and completion are all different events, and a period counted from the wrong one is wrong by however many days separate them. Finding the trigger in the text is the first step in any deadline question.
What a Month Means in a Deadline
A period expressed in months runs to the same day-number in the later month rather than by adding a fixed number of days. Where the later month is shorter and has no corresponding date, the period generally ends on its last day. Periods expressed in days are counted in days regardless of how many months they span, and mixing the two conventions is a common source of error.
Weekends, Holidays and Closures
Where the last day of a computed period falls on a weekend, a holiday or a day the filing office is inaccessible, the period generally extends to the next day it is open. The extension applies to the end of a period rather than to days inside it, and an office being busy, understaffed or closed to visitors is not the same as being inaccessible.