Any Day vs Anyday: Which One Is Correct?

[jassan]

Have you ever written a sentence like "You can call me anyday" and wondered whether any day should actually be written as one word? This is a common English usage question because many similar expressions, such as "anytime" and "everyday," are written as single words. However, when it comes to any day vs anyday, the standard form is clear: any day is the correct choice in standard English.

Understanding this small difference can make your writing more polished and easier to understand. Whether you are writing an email, school assignment, blog post, business message, or social media caption, knowing basic Grammar rules helps you choose the right form.

Any Day vs Anyday: The Quick Answer

The correct form is any day, written as two separate words.

"Any day" is a standard English phrase used when referring to an unspecified day or when saying that something can happen on whichever day is suitable. For example:

You can visit me any day this week.
We can schedule the meeting any day next month.
She could arrive any day now.
I would choose this restaurant over that one any day.

"Anyday," written as one word, is generally considered nonstandard when it is intended to mean "any day." It may appear in informal online writing, brand names, usernames, or casual messages, but it should be avoided in polished and formal writing. Major usage references generally recommend the two-word form.

What Does "Any Day" Mean?

The phrase any day usually refers to a day that has not been specifically identified. It can mean that any day is acceptable, that something could happen at an unspecified time, or that an event is expected soon.

For example, if someone says, "We can meet any day next week," they are saying that they are flexible about the exact day. Monday, Tuesday, Wednesday, or another suitable day could work.

Consider these examples:

I can come any day next week.

This means there is no particular day required.

You can call me any day.

This means the person is available regardless of which day you choose.

The package should arrive any day now.

Here, the speaker expects the package soon but does not know exactly when it will arrive. "Any day now" is a common informal expression for something expected very soon.

Why Is "Anyday" Confusing?

The confusion mainly comes from other English words that look similar.

English contains many combinations that have developed into single words over time. For example, we have:

anytime
everyday
anywhere
anyone
anything

Because these words exist, it can seem logical to assume that "anyday" should also be a single word. However, English does not always follow a perfectly predictable pattern.

At present, any day remains the standard form when referring to an unspecified day. Usage references note that "anyday" may be encountered informally, but it is not the preferred standard spelling.

This is an important lesson in English: two words that look as though they should follow the same pattern do not necessarily behave in the same way.

Any Day as a Phrase

Grammatically, "any day" is made up of the determiner any and the noun day.

The word "any" identifies an unspecified member of a group, while "day" identifies the period being discussed.

For example:

Choose any day that works for you.

In this sentence, "any" modifies "day." The speaker is not talking about one particular day. Instead, they are allowing the listener to select whichever day is suitable.

The same structure appears in phrases such as:

any time
any place
any reason
any person
any opportunity

The fact that some similar combinations have become single words does not automatically mean "any day" should be combined.

Any Day vs Anytime

One reason people write "anyday" is confusion with anytime.

"Anytime" is an accepted one-word form in many uses. For example:

Call me anytime.

This means you can call whenever you want.

However, "any day" does not have the same standard one-word equivalent.

Compare these sentences:

You can call me anytime.

You can visit me any day.

The first uses "anytime" as an adverb. The second uses "any day" as a phrase referring to an unspecified day.

There is also a two-word form, any time, which can be used in different grammatical constructions. This demonstrates why simply copying the spelling pattern of one expression to another can cause mistakes.

Any Day vs Everyday

Another major source of confusion is the difference between any day, every day, and everyday.

These expressions have different meanings and grammatical functions.

Any day refers to an unspecified day:

You can come any day next week.

Every day means each day or daily:

I walk to work every day.

Everyday is an adjective meaning ordinary, common, or routine:

These are my everyday shoes.

The distinction between "everyday" and "every day" is well established. "Everyday" modifies a noun, while "every day" normally functions as a time expression.

The same type of careful thinking should be applied to "any day." Its meaning determines how it should be written.

Examples of Correct "Any Day" Usage

Seeing the phrase in complete sentences makes the rule easier to remember.

In Everyday Conversation
You can come over any day this weekend.
We can have lunch any day you are free.
Call me any day if you need help.
I would eat homemade pizza any day.
She may visit us any day now.
In Professional Writing
Please let us know which day works best; we are available any day next week.
The meeting can be arranged any day during the review period.
Customers may contact the support team any day during business hours.
The delivery could arrive any day this week.
In Academic Writing
Students may submit their forms any day before the deadline.
The experiment can be repeated any day during the testing period.
Participants were allowed to withdraw at any day during the study.

In the final example, "at any time" or "on any day" might sound more natural depending on the intended meaning, showing that word choice matters as much as spelling.

Incorrect Examples to Avoid

When "anyday" is intended to mean "any day," it is better to replace it with the standard two-word form.

Incorrect:

You can visit me anyday.

Correct:

You can visit me any day.

Incorrect:

The package could arrive anyday now.

Correct:

The package could arrive any day now.

Incorrect:

I am free anyday this week.

Correct:

I am free any day this week.

The correction is simple: separate any and day.

Is "Anyday" Ever Used?

You may occasionally encounter "anyday" online. People sometimes use it in text messages, social media posts, usernames, product names, or business branding.

However, informal use does not necessarily make a spelling standard. Writers often shorten words, remove spaces, or create stylized spellings online. A brand might deliberately choose "Anyday" as its name, for example, but that does not mean the spelling should be used in ordinary English sentences.

For professional writing, academic work, websites, reports, and other polished content, any day is the safest and most widely accepted form.

How to Remember the Correct Spelling

A simple trick is to think about what you mean.

If you are talking about one unspecified day, write:

any day

For example:

Pick any day that works for you.

You can also compare it with "some day":

I can visit any day.

Both "any day" and "some day" describe an unspecified day, which makes the two-word structure easy to remember.

Another useful reminder is not to assume that every word beginning with "any" should be joined together. English contains both single words and separate phrases, and each one has to be learned according to standard usage.

Any Day in "Any Day Now"

One of the most common expressions containing these words is any day now.

This phrase means that something is expected to happen very soon, although the exact time is unknown.

For example:

The baby could arrive any day now.

We should receive the results any day now.

The new update may be released any day now.

The expression is widely recognized in English and is normally written as three separate words. Dictionary references describe "any day now" as an expression for something expected very soon.

Final Thoughts

When choosing between any day vs anyday, the answer is straightforward: use any day as two words in standard English.

"Any day" can refer to whichever day is suitable, an unspecified day, or a time that may occur soon, especially in the expression "any day now." Although "anyday" can occasionally be found in informal online writing or branding, it is not the standard spelling for ordinary English sentences.

The best way to avoid this mistake is to remember that any day is a phrase, not a standard single word. Once you become familiar with examples such as "I can come any day," "Choose any day," and "It could happen any day now," the correct spelling becomes much easier to remember.

Small spelling and usage choices can have a noticeable effect on the quality of your writing. By paying attention to these details, you can make your emails, articles, assignments, and everyday communication clearer, more natural, and more professional.