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Syntax Training | Lynn Gaertner-Johnston

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October 31, 2007


Keith S

I found your article because ... wait for it ... COB was in a communication from a colleague in our company and I had no idea what it represented. Interesting in your example, the two would mean the same, but EOD might also be midnight (time zone issues aside), and that the correction inserted an entirely different submission point (unless business closes at noon).

Lynn Gaertner-Johnston

Keith, I am glad you found this blog post. Thanks for your good points.



Typically, COB would be by 5pm and EOD before, well technically midnight, but basically to convey to the other person to expect the report/file/whatever the next morning. Both when used refer to the time zone in which the user of the abbreviation is (unless specified otherwise)

Lynn Gaertner-Johnston

Manan, thank you for contributing.

If everyone in your organization recognizes COB and EOD as you described them, your communication will be efficient.


Nate Paradis

Hi Lynn,

I found your article by searching "COB vs EOD" just before sending out an email. To confuse things even further, the person I'm writing previously used "EOB". I certainly knew they meant "End of Business" but I wanted to stick with "COB" since I used it exclusively during 9 years in the USAF (where acronyms were a way of life!). Thanks for your article!

Lynn Gaertner-Johnston

Nate, thanks for taking the time to comment. EOB? Yikes!



I found this while looking for a reason why anybody in their right mind would use EOB. COB is a more useful acronym because it can be pronounced like a word, Phonetically.
IE:"I need your proposal by cob wednesday."
"I need your proposal by eeeahb?"
If you are composing business correspondence, you should have the intellect to decipher COB from the context of the message. You already knew that eOB was end OF BUSINESS. What possibly could COB mean?! Oh my, I'm so frazzled. Get Real.

Lynn Gaertner-Johnston

Steve, recognizing acronyms is not a matter of intelligence. Spelling them out is.



That's funny! I have heard COB for years and years and only just encountered EOD for the first time this week. I just searched on these terms to confirm whether EOD meant the same as COB (actually, I was hoping it was midnight!)

Lynn Gaertner-Johnston

Hi, Aerin. Sorry I couldn't give you the information you wanted, but you got what you needed!

Thanks for taking the time to comment.



I've always used and have experienced others using EOD...until today. Your article came up in my search as I racked my brain on what COB meant. Perhaps COB vs. EOD popularity is determined by region within the U.S.? I'm in the Southwestern part of the country.

Lynn Gaertner-Johnston

Hi, Holly. Interesting idea--I don't know whether regions determine people's use of the two abbreviations. But I do know that many people are confused by both of them.

Thanks for stopping by to comment.



Found this because was not sure what COB means =))

EoD might be problematic as well - as in finance this means "Event of Default".



Lynn Gaertner-Johnston

Hello, Ruslan. Thank you for warning us about "Event of Default."



This is a clear message:
Please deliver the purchase offer by 17.00 Los Angeles time on Friday 12 November 2013.

Unless it is an internal memo within the same company, this is an obscure message:
PLS deliver your PO by COB 11/12

Lynn Gaertner-Johnston

Hello, B. Thank you for your effective example.

I am not familiar with the expression "purchase offer." But it is fine if both parties understand it.



There you go. I was perfectly familiar with COB, but found your blog when I was wondering what my European colleagues meant by EOD.

However, if I stay back to work on something, my 'EOD' is when I finish, or midnight, whichever comes first.

Lynn Gaertner-Johnston

Caracal, I am glad you found this blog post helpful. Good point: Your EOD may be very different from the COB in your company.



COB also can stand for "Continuity of Business" that ensures critical business functions continue to exist as normal, often used in business disaster recovery planning.

Lynn Gaertner-Johnston

Thanks for the information, Kevin.



What is "TS" in relation to someone saying "by COB" then the respone was "why not by TS" - does anyone know? thanks - Jo

Lynn Gaertner-Johnston

Hi, Jo. I am afraid I do not know. Why not ask the writer?

Unfortunately, I have had to close comments on older posts because I am being killed by spam comments. They flood the site and my inbox. Sorry!


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