Any Day vs. Anyday: Understanding the Correct Usage in English

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Any Day vs. Anyday: Understanding the Correct Usage in English - James callon - 08-18-2026

English has many words and phrases that look simple but can create confusion when we write them. One common example is “any day” vs. “anyday.” The difference may seem small because it is only a space, but that space matters. In standard English, “any day” is the preferred form when you are talking about an unspecified day, a possible day, or a flexible choice of days. The closed form “anyday” is generally considered nonstandard and should be avoided in formal writing.
Understanding this distinction can make your writing clearer and more professional. Whether you are writing an email, school assignment, website content, business document, or everyday message, knowing when to use two words can help you avoid a common mistake. Good Grammar is not simply about following complicated rules. It is also about choosing words in a way that makes your meaning easy for readers to understand.
What Does “Any Day” Mean?
“Any day” is a phrase made up of two separate words: any and day. The word “any” works as a determiner, while “day” is a noun. Together, they refer to an unspecified day or any one of several possible days.
For example:

You can visit me any day this week.
We can have the meeting any day.
The package could arrive any day now.
I am available any day after Monday.
You may choose any day that works for you.

In each example, “any day” refers to a day without identifying one particular date.
The phrase can also suggest that something is expected to happen soon. The expression “any day now” is especially common when something could happen at any moment in the near future. Dictionary.com, for example, lists “any day now” as an expression meaning quite soon.
Is “Anyday” Correct?
In standard English, “anyday” is generally not the form you should use. Writers sometimes combine the two words because English contains many similar-looking compounds, but that does not automatically make “anyday” standard.
For example:
Incorrect or nonstandard:
I can meet you anyday next week.
Preferred:
I can meet you any day next week.
The second version is the safer choice for essays, professional communication, articles, reports, and other formal writing.
You may occasionally see “anyday” in casual online conversations, social media posts, or informal messages. However, informal usage does not necessarily mean that a form is accepted in standard English. Grammarist similarly notes that “any day” is preferred in formal writing and that “anyday” has not established itself as a standard dictionary word in the same way as some other compounds.
Why Do People Confuse “Any Day” and “Anyday”?
One reason for the confusion is that English contains many words that use similar combinations.
Consider these examples:

anyone
anybody
anything
anywhere
anytime
everyday
someday

Because several words beginning with “any” are written as one word, it can seem logical to write “anyday” the same way. However, English does not always follow a perfectly consistent pattern when deciding whether words should be combined.
For example, “everyday” is a standard word when it functions as an adjective meaning ordinary or routine. “Every day,” on the other hand, is used when referring to each day. Merriam-Webster explains this distinction clearly: “everyday” modifies a noun, while “every day” refers to something happening each day.
The same logic should not simply be applied to “anyday.” The standard phrase remains “any day.”
Any Day vs. Everyday
This is one of the most useful comparisons to remember.
Everyday is an adjective:

These are my everyday shoes.
We discussed everyday problems.
Cooking is an everyday activity for many people.

Every day refers to each day:

I walk every day.
She studies every day.
They exercise every day.

Now compare this with any day:

You can call me any day.
We can travel any day next week.
The delivery may arrive any day now.

The space changes the grammatical structure and, in the case of “everyday,” the meaning as well. Scribbr also distinguishes “everyday” as an adjective from “every day” as an adverbial phrase.
Examples of “Any Day” in Everyday Writing
The easiest way to understand the correct form is to see it used in different situations.
Talking About Availability
When someone asks when you are free, you can use “any day” to show flexibility.
Examples:

I am free any day this week.
You can call me any day after five.
We can meet any day that is convenient for you.

Here, “any day” means that there is no specific day that must be selected.
Talking About Possibility
The phrase can also describe something that might happen without a known date.
Examples:

The results could be announced any day now.
The new product may arrive any day.
We could receive an update any day.

In these sentences, the exact day is unknown.
Expressing a Preference
“Any day” can also be used to express a strong preference.
Examples:

I would choose tea over coffee any day.
I would rather walk any day than wait in traffic.
She would pick the first option any day.

Here, the phrase does not necessarily mean an unspecified calendar day. Instead, it can strengthen a statement meaning “in any situation” or “without hesitation.”
Common Mistakes With “Any Day”
Many mistakes happen because writers type the phrase quickly. Here are some examples.
Mistake:
I will call you anyday.
Correct:
I will call you any day.
Mistake:
The parcel should arrive anyday now.
Correct:
The parcel should arrive any day now.
Mistake:
You can visit anyday next month.
Correct:
You can visit any day next month.
Mistake:
I would choose this restaurant anyday.
Correct:
I would choose this restaurant any day.
The corrected versions use “any day” as two words.
“Any Day” in Formal and Informal Writing
One advantage of using “any day” is that it works naturally in both formal and informal contexts.
In a business email, you might write:

Quote:Please let me know which day works for you. I am available any day next week.

In an academic assignment, you might write:

Quote:The event could occur on any day during the observation period.

In casual conversation, you might say:

Quote:Come over any day!

The phrase fits all of these situations, so there is little reason to replace it with the nonstandard “anyday.”
A Simple Trick to Remember the Difference
If you are unsure whether to write “any day” or “anyday,” think about the word day as an actual noun.
Ask yourself: Am I talking about a day?
If the answer is yes, keep the words separate.
For example:

any day this week
any day after Friday
any day of the month
any day you choose
any day now

This simple test can help you remember the correct spelling.
Another useful trick is to compare “any day” with “any time.” Grammar references commonly treat “any day” as a two-word combination in which “any” modifies the noun “day.”
Is “Any Day” the Same as “Any Time”?
They can sometimes express similar ideas, but they are not always interchangeable.
“Any day” specifically relates to days or occasions.
For example:

Quote:You can visit me any day.

“Any time” is broader and can refer to any moment or period.

Quote:You can call me any time.

If someone asks when they can visit next week, “any day” is a natural response because the question concerns days. If someone asks when they can call, “any time” may be more appropriate because the question concerns a time of day.
Choosing the right expression depends on what you are actually trying to communicate.
Why Correct Word Spacing Matters
A single space can sometimes make a significant difference in English. Words that appear similar are not necessarily interchangeable, and writers should not assume that two words can be joined simply because other expressions are written as compounds.
Using the correct form helps readers immediately understand your meaning. It also gives your writing a more polished appearance.
This is particularly important when writing for professional or academic audiences. A small spelling or word-spacing error may not completely change the meaning of a sentence, but repeated mistakes can make writing appear less carefully edited.
Quick Comparison
Form
Standard Usage
Example
Any day
Yes
I can visit any day next week.
Anyday
Generally nonstandard
Avoid it in formal writing.
Any day now
Yes
The results could arrive any day now.
Everyday
Yes, as an adjective
These are my everyday clothes.
Every day
Yes, meaning each day
I read every day.
This comparison shows why it is important to consider the grammatical role of a phrase instead of relying only on how familiar it looks.
Frequently Asked Questions
Is “any day” one word or two?
“Any day” is written as two words in standard English.
Is “anyday” a spelling mistake?
In most standard writing, “anyday” should be treated as a nonstandard form or spelling mistake. Use “any day” instead.
Can I use “anyday” in a text message?
You may encounter “anyday” in informal online writing, but “any day” is still the recommended standard form.
What does “any day now” mean?
“Any day now” means that something is expected to happen very soon, although the exact day is unknown.
Is “any day” used in British and American English?
Yes. “Any day” is standard in both British and American English.
Final Thoughts
The difference between “any day” and “anyday” is easy to remember once you understand how the phrase works. In standard English, use “any day” as two separate words when you mean an unspecified day, a possible day, a flexible choice, or an expression such as “any day now.”
Although “anyday” may appear in casual online writing, it is best avoided when you want your writing to be clear, polished, and grammatically standard. The same principle applies to many confusing word pairs in English: do not assume that similar-looking expressions follow identical rules.
When in doubt, remember the simple rule: choose “any day” with a space. Whether you are writing an email, article, assignment, or everyday message, this small habit will help keep your writing accurate and professional.