COB Meaning, Definition, When to Use (vs. EOD)

COB? What's the meaning of COB? Acronyms are a quick and easy way for business professionals to communicate. When a supervisor assigns a job, they can specify whether it is due at the end of the day or at the close of business (COB) (EOD). The word origin comes from the United States Military when all training and administrative work stops.

cob meaning

To prevent missing any key deadlines, it's critical to understand the difference between COB and EOD.

What exactly is COB?

COB stands for "close of business" and is used by professional organizations to refer to the conclusion of the business day. Many professionals base COB hours on the times when firms in the United States customarily shut, which is usually 5 p.m. Eastern Standard Time (EST). When setting a deadline, employers frequently allude to this period. If a supervisor specifies a job must be completed by COB on Friday, the assignment's deadline is Friday at 5 p.m. EST.

COB is also the time when the financial markets in New York City shut, which is why many business professionals use and comprehend this term on a daily basis. Some employers use COB interchangeably with other acronyms having similar meanings, such as the end of business (EOB).

What exactly is EOD?

The term EOD stands for "end of the day," which refers to the end of a working day. Some businesses can use the terms EOD and COB interchangeably, but there are a few important distinctions. Supervisors often anticipate employees to finish projects by the end of the business day in their own time zone when they assign assignments to be completed by EOD. When someone gives a job to someone in a different time zone, it's generally due by the end of the sender's business day.

What are business days to employers?

A business day refers to an organization's conventional operating hours, which are typically Monday through Friday from 9 a.m. to 5 p.m. When companies talk about business hours, they typically mean these conventional hours. Even if a business is open late, most business experts do not consider such hours to be business hours.

cob meaning

When should you utilize COB vs EOD?

COB or EOD can be used by you or your boss in a variety of situations, depending on the circumstances.

The following are some examples of why COB is the best option:

Speaking with clients in different time zones is a challenge.

If you work with clients that have offices in various states, it's probably preferable to utilize COB when indicating when you'll submit assignments or when you require information from them.

You can prevent misunderstanding by utilizing COB as a neutral time for both you and them to submit tasks or arrange meetings because you're in separate time zones. COB is a well-known acronym that most professionals use on a daily basis, therefore this is usually a good option to utilize in this situation.

In EST, the end of the day is referred to as close of business.

It's possible that you'll have to finish and submit tasks to clients that work on Eastern Standard Time. Asking team members to provide the papers you need to offer clients by COB is the easiest approach to rapidly convey these deadlines. It's also a useful acronym to use when requesting clients in the Eastern Time Zone to provide their own notes or information by the end of the day in their own time zone.

The following are examples of situations where EOD is most appropriate:

Employees are given timelines to meet.

Because EOD generally refers to your own or the sender's time zone, it's preferable to utilize it when discussing deadlines with individuals who are familiar with yours. This is why many professionals utilize EOD to establish deadlines for completing assignments at the end of specific workdays. It's a simple and effective approach to keep track of several assignments and their due dates without having to write long lines.

Submitting projects to clients in eastern time zones.

If one of your clients lives in the same city, state, or time zone as you, it's a good idea to let them know that you'll be sending them files by EOD. There should be no question about when they'll receive their assignments from you because you're both in the same time zone and are aware of the time zone you're referring.

Additional workplace abbreviations to consider.

Professionals can employ acronyms you're unfamiliar with when stating a deadline, depending on where you work. These acronyms can be used in place of COB or EOD, or they can be shown alongside them. Other frequent workplace abbreviations include:

  • EOB (end of business day): This is a mixture of COB and EOD, and it denotes the conclusion of a workday for an employee. It's also often confused with both of these abbreviations.
  • COP (close of play): This abbreviation is sometimes used for COB since it has the same meaning but more clearly relates to the financial markets' closure.
  • EOP (end of play): Many professionals use the abbreviation EOP (end of play) instead of COB. It's similar to COP in that it also alludes to the end of the financial markets.

COB vs. EOD use examples

COB or EOD are commonly used in the workplace in the following situations:

Speaking with out-of-state clients.

If you're discussing deadlines or seeking information from clients in different time zones, you can utilize COB. If they're a new client or you're interacting with them for the first time, mention the time to avoid any confusion.

"By COB ( EST), our team will submit a budget proposal for our next product marketing plan."

Setting deadlines with clients in EST, for example.

When working with clients in EST, another good occasion to use COB is when creating deadlines. When defining deadlines by COB, there should be minimal to no misunderstanding because COB already refers to 5 p.m. EST.

"Please submit your company address by COB Friday so that we can send you the documentation to sign," for example.

Because you and the people you deal with are in the same time zone, you can utilize EOD to set deadlines for them to submit tasks. This acronym is a fantastic method to rapidly list assignments and due dates without taking up a lot of space or time.

When submitting tasks example:

The following things must be completed this week:

  • Prepare a draft of a blog post for Monday EOD.
  • Apply blog post modifications by Wednesday EOD.
  • Publish a blog entry by the end of the day on Friday.

cob meaning

author: patrick algrim
About the author

Patrick Algrim is a Certified Professional Resume Writer (CPRW), NCDA Certified Career Counselor (CCC), and general career expert. Patrick has completed the NACE Coaching Certification Program (CCP). And has been published as a career expert on Forbes, Glassdoor, American Express, Reader's Digest, LiveCareer, Zety, Yahoo,, SparkHire,,, FairyGodBoss,, St. Edwards University, NC State University,, Thrive Global,, Work It Daily, Workology, Career Guide, MyPerfectResume, College Career Life, The HR Digest, WorkWise, Career Cast, Elite Staffing, Women in HR, All About Careers, Upstart HR, The Street, Monster, The Ladders, Introvert Whisperer, and many more. Find him on LinkedIn.

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