In business writing, are days of the week capitalized? Is there a standard format? Is there one right way to do it? In this blog post, we will explore the rules surrounding the capitalization of days of the week and help you determine the best approach for your writing.
What are the Days of the Week and Should they be Capitalized?
The seven-day week is the international standard that is used by the vast majority of the world. It has been in use for millennia and its origins can be traced back to ancient Mesopotamia. The seven-day week was later adopted by the Romans and then spread throughout Europe and the rest of the world.
There are several theories about why there are seven days in the week, but the most likely explanation is that it reflects the natural cycle of the Sun and Moon. The seven-day week is a convenient way to break up time into manageable chunks and it has proven to be an enduring system.
In summary, the capitalization of days of the week is largely a matter of style, and while there are general conventions, different style guides may vary.
How to Remember which Days of the Week are Capitalized
The key to remember which days of the week are capitalized is understanding why they are capitalized in the first place. Days of the week are named after celestial bodies, which in turn are named after Roman gods, reinforcing the tradition of capitalization.
Monday is named after the moon, which is named after the goddess Diana. Tuesday is named after Mars, the god of war. Wednesday is named after Mercury, the messenger god. Thursday is named after Jupiter, the king of the gods. Friday is named after Venus, the goddess of love. Saturday is named after Saturn, the god of time. And Sunday is named after the sun, which is associated with the god Apollo.
So next time you’re trying to remember which days of the week are capitalized, just think about the Roman Gods.

The Importance of Capitalizing the Days of the Week
The capitalization rules for days of the week can be confusing. Should they be capitalized or lowercase? What if you’re writing a headline? This depends on the context but there are some guidelines you can follow.
- In formal writing, capitalize the days of the week (e.g., ‘Monday’). In informal contexts, you may choose to lowercase them (e.g., ‘monday’).
- If you’re using abbreviations (e.g., “Mon.”), be consistent throughout your piece.
- When in doubt, err on the side of caution and go with the more formal option. After all, it’s always better to be too formal than too casual.
Capitalization Guidelines from Different Style Guides
When asking, are days of the week capitalized in formal writing, it’s essential to reference style guides for clarity. Different guides provide slightly varying instructions. Here are some key guidelines from major style guides:
- Chicago Manual of Style: Days of the week should always be capitalized, regardless of where they appear in a sentence.
- APA Style: Similar to Chicago, the days are capitalized when used within sentences or dates. APA emphasizes the importance of consistency throughout academic and formal papers.
- AP Stylebook: The Associated Press also mandates capitalizing days of the week, particularly in headlines and news articles. However, it advises being cautious about overcapitalization in informal contexts.
- MLA Style: In Modern Language Association guidelines, days of the week should always be capitalized when referenced directly.
In summary, if you’re unsure are days of the week capitalized, adhering to the guidance of these style guides ensures proper formatting and a professional tone. Always check which style guide is relevant to your writing context for best results.
Are Days of the Week Capitalized?: When to Capitalize it?
You should only capitalize the days of the week when you are referring to them as a specific calendar date. For example, “I have a meeting on Wednesday” or “We’re closed on Sundays.” Otherwise, there’s no need to capitalize them. This rule also applies to the months of the year.
Days of the week are an important part of our lives and our calendars, but the rules surrounding their capitalization can be confusing.
In general, you should follow the rule that if you’re writing in a formal style, capitalize them; if you’re writing in a more casual style, it’s fine to lowercase them. When in doubt, err on the side of caution and go with the more formal option. By following these guidelines, you can ensure that your writing is always clear and accurate.
Which Words Should Always be Capitalized in a Sentence?
The words that should always be capitalized in a sentence are: I, my, you, your, he, him, she, her, it, we, us, they, them. Other words may be capitalized as well, but these are the words that should always be capitalized. The reason for this is that they represent people or things.
When you capitalize them, it shows that you are referring to a specific person or thing. If you were to write “i saw a cat,” it would not make sense because “I” is the subject and “cat” is the object. However, if you were to write “I saw a Cat,” it would make sense because you are referring to a specific cat. This is why it is important to always capitalize the words that represent people or things.
In terms of the days of the week, there is no definitive answer to this question because it depends on how you use the days of the week in a sentence. Generally, when the days of the week are used as part of a title, they should be capitalized. However, if they are used as part of the body of a sentence, they should not be capitalized unless they are at the beginning of a sentence.
How to Properly Format Dates Using Day Abbreviations
There’s a lot of confusion out there about how to format dates correctly, especially when it comes to abbreviating the days of the week. Here are a few guidelines to help you get it right:
- Always use abbreviations for the days of the week, e.g. Mon, Tues, Weds, Thurs, Fri, Sat, Sun.
- Abbreviations should always be capitalized.
- When writing the full date, use the order day-month-year, e.g. 21st March 2016.
- If you’re using numerical month formats, use leading zeroes, e.g. 01/03/2016.
By following these simple guidelines, you can ensure that your dates are correctly formatted and easy to understand.
Examples of How to Correctly Capitalize Days of the Week in a Sentence
The days of the week are capitalized when they are used as proper nouns.
- For example, Monday is the first day of the week, so it is written with a capital M. Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday are also written with capital letters.
When these days are used in sentences, they are usually not followed by a comma.
For example:
- I have to work on Saturday.
However, if the day of the week is at the beginning of a sentence, it is followed by a comma.
For example:
- Saturday, I have to work.
The same rule applies to months of the year. January, February, March, April, May, June, July, August, September, October, November, and December are all written with capital letters.
When these months are used in sentences, they are usually not followed by a comma.
For example:
- My birthday is in September.
However, if the month is at the beginning of a sentence, it is followed by a comma.
For example:
- September is my birthday month.
By following these simple rules, you can ensure that your writing is grammatically correct when mentioning days of the week or months of the year. Proper capitalization enhances the readability and professionalism of your text, making your writing more polished and easier to understand.
Common Mistakes to Avoid When Capitalizing Days of the Week
If you’re wondering are days of the week capitalized correctly in your writing, it’s easy to make some common mistakes. Avoid these errors to ensure your writing remains clear and professional:
- Inconsistent Capitalization: Mixing lowercase and uppercase days of the week within the same text is one of the most frequent mistakes. Always maintain uniformity.
- Overcapitalization in Casual Writing: While are days of the week capitalized in formal settings? Yes, but in casual writing—like text messages—capitalizing them can feel overly formal and unnecessary.
- Incorrect Abbreviation Use: When abbreviating, days should still be capitalized. For example, write “Mon.” not “mon.” Consistency in abbreviations is key to professional communication.
- Failure to Follow Style Guidelines: Depending on your writing style guide (Chicago, APA, AP), ensure you’re using the proper capitalization rule.
By avoiding these mistakes, you can present polished, consistent writing, whether in formal documents or casual correspondence.
Conclusion
There are a few different schools of thought on days of the week capitalization. While it’s not incorrect to capitalize them, it is more common to see them written in lowercase letters. Whichever style you choose, be consistent with it throughout your document. The important thing to remember is that days of the week are integral parts of our lives, and whatever way you choose to recognize them should be respected.
Ultimately, whether you choose to capitalize ‘Monday’ or write it as ‘monday,’ what matters is how you utilize your time. Make sure to make the most of your week and turn each day into something special. After all, each day is a chance to start fresh and create something new.
Happy Monday! Or monday! It’s up to you! 🙂
FAQs
Are the days of the week capitalized?
This is a question that has been debated for years. There is no one right answer, as the capitalization of days of the week can vary depending on where you live and what style guide you follow. However, in general, most people capitalize the first letter of each day of the week.
Why are the days of the week capitalized?
There are a few reasons why days of the week are typically capitalized. One reason is that they are considered formal titles, similar to President or Doctor. Another reason is that they are often included in headings or titles, such as “Monday’s Meeting.” Finally, many people believe that it sets them apart from other words in a sentence.
Are there any exceptions to the rule?
Yes, there are some exceptions to this rule. For example, if you are writing in a more informal setting (such as a blog post), then you may choose not to capitalize the days of the week. Additionally, some style guides suggest using lowercase for all days of the week except Sunday. In these cases, it is best to follow your own personal preference or the conventions of your particular industry.
In conclusion, while the capitalization of days of the week can vary depending on where you live and what style guide you follow, most people capitalize each day’s first letter. However, there are some exceptions to this rule so make sure to do further research or consult with an expert if you require more specific guidance.