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I would like to ask if the following sentence is correct:

"This certificate should be renewed prior to a month from its expiration date"

closed as off-topic by Nathan Tuggy, Andrew, ColleenV May 6 '18 at 15:33

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions asking for someone to find and correct errors or improve the phrasing are considered requests for proofreading and are off-topic. Please edit your question to focus on something in particular that you are unsure about; if that's not possible, see websites for proofreading instead." – Nathan Tuggy, Andrew, ColleenV
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The phrasing suggested is not commonly used and when I first read "prior to a month from" it said to me "at" or "on". However, reading it properly, it reads worse. It actually implies that you have a month from expiry to renew the certificate because breaking that part of the sentence up you get

[Prior to] [a month From....]

In other words

This certificate should be renewed within a month after its expiration date

To alter it to convey what I believe you wish to say, you could change it to

This certificate should be renewed at least one month prior to the expiration date.

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