time limit

A procedure must be completed by B, but it can be done at any time between A and B. Or a right can be claimed during such a period.

How can I explain B by using "within"? Is it:

within three weeks from A


within three weeks after A


within three weeks since A

or something else?


  • The procedure must be completed within three weeks from A.

  • The right can be claimed within three weeks after A.

  • I'm not a native speaker, but from sounds more natural – w.b May 10 '15 at 22:07
  • Note that you're speaking of a deadline. – Hot Licks May 11 '15 at 0:01
  • since is only used when the reference time is in the past, and is used when reporting something, not specifying a deadline. – Barmar May 11 '15 at 16:24

There is evidence of usage for several variations:

  • within n weeks of A:

The Quality Standard Subcometee recommends treatment... within 4 weeks... of symptom onset.

from: Textbook of Peripheral Neuropathy (I cut out the medical details which were unimportant for this question.)


Within several weeks of the opening of school we heard replies from all...

from: The School within Us: The Creation of an Innovative Public School By James Nehring

  • within n weeks after:

Conjunctivitis is common, and corneal opacities can occur but usually resolve within 6 weeks after cessation of therapy.

from: Textbook of Therapeutics: Drug and Disease Management edited by Richard A. Helms, David J. Quan

  • within n weeks from:

The person notified can file an objection to the Minister of Finance, within six weeks from the date of the decision taken by the Minister.

from: Global Forum on Transparency and Exchange of Information for Tax Purposes... by OECD

It is perhaps worthwhile noting that most vertebral fractures heal within 6-12 weeks from injury.

from: Spinal Trauma - An Imaging Approach By Victor N. Cassar-Pullicino, Herwig Imhof


If you state both dates use from A to B...

"...must be completed within the three weeks from A to B."

If you only give the first date, use of

"...must be completed within three weeks of A"

"...must be claimed within three weeks of A."


I deal with similar deadlines in my profession. In order to be unambiguous, I always say, "within 60 days from the date of sign-up".

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