Any Day vs. Anyday: Which One Is Correct?

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August 18, 2026 at 11:16 am #14497
James callon
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English is full of small word choices that can create confusion, especially when two forms look almost identical. Any day and anyday are a good example. The difference is only a space, but that small space determines whether the expression follows standard English usage. If you have ever wondered whether you should write “I can visit you any day” or “I can visit you anyday,” you are not alone.
The correct form in standard English is any day, written as two separate words. It is used when talking about an unspecified day, a flexible date, or a situation that could happen at an unknown time. “Anyday” sometimes appears in casual messages and online writing, but it is generally considered nonstandard and should be avoided in formal, academic, business, and professional writing.

<h2>Any Day vs. Anyday: The Quick Answer</h2>
The easiest rule to remember is simple:
Any day = correct standard English
Anyday = generally nonstandard
For example:

<ul data-spread=”false”>
Correct: I can meet you any day next week.
Incorrect: I can meet you anyday next week.
Correct: The package could arrive any day now.
Incorrect: The package could arrive anyday now.

The two words “any” and “day” work together as a phrase. “Any” acts as a determiner, while “day” is the noun it describes. Because “anyday” has not become a standard compound word in the way some other English expressions have, keeping the words separate is the safest choice.

<h2>What Does “Any Day” Mean?</h2>
The phrase any day generally means an unspecified day or whichever day is suitable. It can be used when a person has several possible choices and does not need to select one particular date.
For example:

You can call me any day this week.
We can arrange the meeting any day after Monday.
She can visit her family any day.
I am available any day next month.

In each sentence, the speaker is not identifying one specific day. Instead, the expression leaves the choice open.
The phrase can also describe something that is expected to happen soon but whose exact timing is unknown. This is especially common in the expression any day now.
For example:

The baby could arrive any day now.
The results should be announced any day now.
Our new furniture should be delivered any day now.

Here, “any day now” suggests that something is expected very soon, although nobody knows the exact day.

<h2>Why Is “Anyday” So Confusing?</h2>
One reason people write “anyday” is that English contains many similar-looking expressions. Some combinations of words are written separately, while others have developed into accepted compound words.
Consider these examples:

every day — two words when meaning each day
everyday — one word when meaning ordinary or routine
any time — commonly written as two words when “time” is a noun
anytime — also accepted as an adverb in many contexts
any one — two words in some constructions
anyone — one word when referring to any person
any way — two words when referring to a method
anyway — one word meaning regardless or in any case

Because English allows some similar combinations to become compound words, it is understandable that writers may assume “anyday” should also be one word. However, standard usage still favors any day.

<h2>Any Day in Everyday Sentences</h2>
Learning the correct expression becomes easier when you see it in natural sentences.
Here are several examples:
I can come any day this week.
The speaker is available on whichever day works.
You can submit the form any day before Friday.
The exact day is flexible, but there is a deadline.
We could receive the news any day now.
The news is expected soon.
She is welcome to visit us any day.
There is no specific day required.
I would choose this restaurant over that one any day.
Here, “any day” is used to emphasize a strong preference.
The weather could change any day.
The speaker is talking about an uncertain future day.
These examples show that the expression works naturally in conversations, emails, articles, essays, and professional communication.

<h2>Any Day in Formal Writing</h2>
Using the correct form becomes particularly important in formal writing. Academic papers, business reports, applications, websites, professional emails, and official documents should follow standard English conventions.
Writing “anyday” may look like a simple typing mistake. While one spelling mistake is unlikely to change the meaning of a sentence, repeated errors can make writing appear less polished.
For example:
Incorrect:
“Applicants may submit their documents anyday during the application period.”
Correct:
“Applicants may submit their documents any day during the application period.”
The second version is clearer and follows conventional English usage.
Good Grammar is not only about complicated rules. It also involves choosing familiar and accepted forms so that readers can understand your writing without distraction.

<h2>Any Day vs. Everyday</h2>
Another common source of confusion is every day versus everyday.
Although these expressions look similar, they have different functions.
Every day means each day.
Example:

I exercise every day.

Everyday is an adjective meaning ordinary, usual, or routine.
Example:

These are my everyday shoes.

The same pattern should not automatically be applied to “any day.” The fact that “everyday” is a valid one-word adjective does not mean that “anyday” is the standard equivalent of “any day.”
This is an important lesson in English: similar-looking word combinations do not always follow exactly the same rules.

<h2>Any Day vs. Anytime</h2>
The comparison with anytime can make the issue even more confusing.
“Anytime” is accepted as an adverb meaning whenever or at any time in many varieties of English. For example:

You can call me anytime.

However, any day continues to be written as two words when referring to a day.
Compare:

You can call me anytime.

with:

You can visit me any day.

The words may have similar meanings in certain contexts, but their spelling conventions are different.

<h2>A Simple Trick to Remember “Any Day”</h2>
If you are unsure whether to write “anyday,” use a simple mental test: ask whether you are talking about a day that has not been specified.
If the answer is yes, use any day.
For example:

Can we meet on Monday? No, but we can meet any day next week.
When will the delivery arrive? It could arrive any day now.
Which day should I choose? Any day is fine.

Another useful trick is to remember that “day” remains a normal noun in these sentences. Since “any” is simply describing that noun, the two words stay separate.

<h2>Common Mistakes to Avoid</h2>
Here are some frequent mistakes and their corrections:
Wrong: I can call you anyday.
Right: I can call you any day.
Wrong: The package may arrive anyday now.
Right: The package may arrive any day now.
Wrong: We can schedule the appointment anyday next week.
Right: We can schedule the appointment any day next week.
Wrong: She could visit anyday.
Right: She could visit any day.
Wrong: You can choose anyday that works for you.
Right: You can choose any day that works for you.
These corrections are simple, but practicing them can help make the correct form automatic.

<h2>Why Correct Word Spacing Matters</h2>
A single space can sometimes change how a word functions or whether it is considered standard. English contains many examples where spacing matters, including “a lot” versus “alot,” “every day” versus “everyday,” and “any way” versus “anyway.”
This is why paying attention to word formation is an important part of improving writing. Correct Grammar and spelling make sentences easier to read and help writers communicate their ideas confidently.
If you regularly write emails, articles, assignments, website content, or social media posts, developing awareness of these small differences can significantly improve the overall quality of your writing.

<h2>Final Verdict: Any Day or Anyday?</h2>
When choosing between any day and anyday, the answer is straightforward: use any day in standard English.
Any day is the accepted two-word phrase used for an unspecified day, a flexible date, or something expected to happen at an uncertain time. Anyday may occasionally appear in informal online writing, but it is generally treated as a nonstandard form and is best avoided, especially in formal or professional contexts.
Remember the simple rule:
Any day = standard and recommended
Anyday = generally avoid
Once you remember that “any” modifies the noun “day,” the correct spelling becomes much easier to recognize. Whether you are writing an academic assignment, professional email, blog post, or everyday message, choosing any day will keep your writing clear, natural, and grammatically sound.

Any Day vs. Anyday: Which One Is Correct?

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