1

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

or

within three weeks after A

or

within three weeks since A

or something else?

example:

  • 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
2

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.)

or

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

1

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."

0

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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