What is the correct version for September as abbreviation: Sep or Sept.? I have done some research but I see different answers and both Sep and Sept. are supported in their own way and I'm a little bit confused. Could you please advise me what is the right way of abbreviating September?

closed as primarily opinion-based by AndyT, David, Mari-Lou A, FumbleFingers, Edwin Ashworth Sep 8 '17 at 18:35

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  • For these "popularity" questions, ngram may be helpful e.g. books.google.com/ngrams/… – k1eran Sep 5 '17 at 8:32
  • Don't see why this is downvoted, really. It's a perfectly valid question even though it doesn't matter too much which one people use. To be clear, the asker is not looking for which one is more popular, they're looking for which one is the correct usage, which has an answer and it seems Andrew has already given it. – John Hamilton Sep 5 '17 at 12:16
  • Please include in your question the research you have done. – AmE speaker Sep 5 '17 at 13:45
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    There is no universal way to abbreviate month names in English; it is a matter of style. Adhere to the discipline of your editor, publication, or organization, or in the absence of a house style, observe whichever style manual is appropriate to your taste and medium. – choster Sep 5 '17 at 14:34

If you want consistent three-letter abbreviations for each month, then Sep is perfectly acceptable. It's in general use.

There may be those who insist on Sept as the Latin prefix which takes the -ember suffix, and use that to justify Sept along with Nov and Dec. But Nov and Dec are just as likely to be "the first three letters" and it's fine to adopt Sep on that basis too.

However, I've also seen SPT for September; and UK railway tickets have been known to use a combination of first and last letters with one other letter from the middle of the name (JNY, FBY, DMR), although that's less common now.

As long as the context makes it clear that the word is an abbreviated month, and the month can be readily interpreted, it doesn't actually matter what it is.


Both abbreviations are correct. Source: http://www.abbreviations.com/abbreviation/September

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