Anyday vs Any Day: What’s the Difference?

If you are wondering whether “anyday” or “any day” is correct, the standard form is “any day” when you mean “on any day” or “whenever you choose.” Anyday is generally not accepted as the standard spelling in formal English.

This small spelling difference can create confusion because English contains many compound words that are written as one word, while others remain two words.

In this guide, you’ll learn the difference between anyday and any day, their meanings, correct usage, examples, common mistakes, and how any day compares with related expressions such as anytime, every day, and any time.

Table of Contents

Quick Answer

Any day is the correct standard form in most situations.

It is written as two separate words when it means:

on any day
whichever day
at any time in the future, depending on context
without choosing a specific day

For example:

You can visit me any day next week.

Anyday as one word is generally considered nonstandard and should be avoided in formal writing.

Form	Standard?	Example
Any day	✅ Yes	You can come any day.
Anyday	❌ Generally nonstandard	Avoid anyday in formal writing.

If you’re writing an email, school assignment, website article, business document, or academic paper, any day is the safer and correct choice.

What Does Any Day Mean?

Any day is a two-word phrase that refers to one day without specifying exactly which day.

It can mean that something may happen on whichever day is suitable or acceptable.

For example:

You can call me any day.
We can meet any day this week.
She could arrive any day now.
I’d choose this restaurant over the other one any day.

The exact meaning depends on the sentence.

In some contexts, any day means whichever day you want. In other contexts, it can mean at any time from now onward, particularly when discussing something expected soon.

The important point is that the standard spelling is any day, with a space between the two words.

Why Do People Confuse Anyday and Any Day?

The confusion comes from the way English creates compound words.

English has many expressions that originally consisted of separate words but later became established as single words. Examples include:

anytime
anywhere
anybody
everyone
someone
sometimes

Because anytime is normally written as one word in many uses, people sometimes assume that any day should also be written as anyday.

However, English spelling does not always follow a simple pattern.

The fact that anywhere is one word does not mean any day must also be one word.

For standard English writing, any day remains the preferred form when referring to a day.

Any Day vs. Anyday: The Main Difference

The main difference is spelling and standard usage.

Any day consists of two words:

any — a determiner that refers to an unspecified choice or amount
day — a noun referring to a period of 24 hours or a particular calendar day

Together, they form the phrase any day.

Anyday, on the other hand, is generally not treated as the standard form in ordinary English writing.

This makes the choice relatively simple:

Use “any day,” not “anyday.”

For SEO content, professional communication, academic writing, and educational material, sticking with the standard form is especially important.

When Should You Use Any Day?

Use any day when you are talking about an unspecified day or giving someone freedom to choose a day.

1. When Any Day Is Acceptable

You can use any day when every day within a particular period is suitable.

Examples:

I am available any day this week.
You can schedule the meeting any day.
We can start the project any day next month.
She is free any day after Monday.

Here, any day means that no particular day has been selected.

2. When You Mean Whichever Day

Any day can also express a preference or comparison.

For example:

I’d choose walking over driving any day.

This means the speaker would choose walking whenever given the choice.

Another example is:

I would rather read a book any day than watch that movie.

Again, any day is written as two words.

3. When Something Could Happen Soon

Sometimes any day is used to indicate that something is expected very soon.

For example:

The baby could arrive any day now.

This means the baby could arrive at any time in the near future.

Similarly:

We are expecting the results any day now.

The expression still uses two words.

Is Anyday a Word?

In standard English, anyday is generally not the preferred spelling.

You may occasionally see anyday used online, especially in informal posts, usernames, branding, or other contexts where people intentionally combine words.

However, that does not make it the standard spelling for ordinary English.

If you’re writing:

an article
an email
a school assignment
an academic paper
a business document
a formal report
professional website content

use any day.

A simple rule is:

If you mean “any particular day,” write “any day.”

Any Day in a Sentence

Seeing the phrase in context makes its usage easier to understand.

Here are several examples:

You can visit us any day this week.
I am available any day after 5 p.m.
We can discuss the matter any day.
She may call any day now.
I’d choose summer over winter any day.
You can submit your application any day before Friday.
He could return any day.
We are ready to leave any day you choose.
I would take this opportunity any day.
The package should arrive any day now.

In every example above, any day is written as two words.

Any Day vs. Anytime

Another common source of confusion is any day versus anytime.

Although they can sometimes communicate similar ideas, they are not interchangeable in every sentence.

Any day specifically relates to a day.

Anytime generally means at any time.

Compare these examples:

You can visit any day.

This suggests that whichever day you choose is acceptable.

Now consider:

You can call me anytime.

This means you can call at any time.

The distinction is important:

Expression	Meaning	Example
Any day	Any particular day	Come any day this week.
Anytime	At any time	Call me anytime.

So, if the sentence is specifically about choosing a day, any day is usually the appropriate expression.

Any Day vs. Any Time

Any day and any time can also appear in similar contexts, but their meanings are different.

Any day refers to a day.

Any time refers to a point or period of time.

For example:

We can meet any day next week.

The speaker is discussing possible days.

But:

We can meet any time next week.

The speaker is being flexible about the time of the meeting.

Notice that any time is written as two words when it functions as a noun phrase.

This distinction can help you avoid unnecessary spelling mistakes.

Any Day vs. Every Day

Do not confuse any day with every day.

They have different meanings.

Any day means one unspecified day or whichever day is suitable.

Every day means each day.

Compare:

You can call me any day.

This means you can choose whichever day.

I call my parents every day.

This means I call them each day.

Phrase	Meaning
Any day	One unspecified or chosen day
Every day	Each day

This difference is especially important in everyday English because changing any to every can completely change the meaning of a sentence.

Common Mistakes With Any Day

Many learners make small mistakes when using this phrase.

Mistake 1: Writing Anyday

❌ You can come anyday.

✅ You can come any day.

The standard spelling is any day.

Mistake 2: Confusing Any Day With Every Day

❌ I go to school any day.

If you mean that you go to school each day, use:

✅ I go to school every day.

Mistake 3: Using Any Day When You Mean Anytime

❌ You can call me any day.

If you mean that someone can call at any hour, the better expression is:

✅ You can call me anytime.

Mistake 4: Assuming Similar Words Follow the Same Pattern

Because words such as anywhere and anytime can be written as one word, learners may incorrectly write anyday.

English spelling must be learned according to established usage rather than by applying one spelling pattern to every similar expression.

Any Day in Formal and Informal Writing

In formal writing, use the standard form any day.

For example:

The appointment may be scheduled for any day during the first week of September.

This is clear and grammatically standard.

In informal digital communication, you may encounter anyday occasionally. However, seeing a form online does not necessarily mean it is the recommended spelling.

If you’re writing content for a website, professional email, academic assignment, or educational resource, there is little reason to choose the nonstandard anyday.

Using any day gives your writing a more polished and reliable appearance.

Any Day in American and British English

The spelling any day is used in both American English and British English.

Unlike some spelling differences such as:

color / colour
center / centre
organize / organise

there is no major American-versus-British spelling distinction here.

Whether your audience uses American English or British English, any day is the standard choice.

This makes the rule particularly easy:

American English: any day
British English: any day

Google Trends and Usage Perspective

Searches such as “anyday or any day,” “any day meaning,” and “is anyday a word?” usually come from people who have encountered the expression in writing and are unsure about its spelling.

This type of spelling question is common because English contains many similar-looking expressions with different conventions.

For example:

anyone
anybody
anywhere
anytime
any day

Some are commonly written as single words, while any day remains two words in standard usage.

When creating educational or SEO content around spelling questions, answering the exact search intent is important. A reader searching “anyday or any day” usually wants a quick answer first, followed by examples and an explanation of why one form is preferred.

Quick Memory Trick for Any Day

Here’s an easy way to remember the correct spelling:

Think about the word “day.”

If you’re talking about a specific or unspecified day, keep day separate:

ANY + DAY = ANY DAY

You can also remember this example:

“You can visit any day.”

If you are talking about time in general, you may use anytime:

“You can call anytime.”

So:

Day → any day
Time → anytime

This simple distinction can prevent many common spelling mistakes.

More Examples of Any Day

Here are additional examples showing natural usage:

Casual English

Come over any day.

We can hang out any day this week.

Professional English

The meeting can be arranged on any day that is convenient for you.

Academic Context

Students may submit their work on any day before the deadline.

Business Communication

Please let us know if you are available any day next week.

Everyday Conversation

I’d eat pizza any day.

Future Possibility

The announcement could be made any day now.

These examples demonstrate how flexible any day can be while maintaining the same two-word spelling.

FAQs

Is any day correct or anyday?

Any day is the standard and preferred form. Anyday should generally be avoided in formal English writing.

Is anyday one word?

Although anyday may occasionally appear informally, it is generally not the standard spelling. Use any day in normal English writing.

What does any day mean?

Any day means an unspecified day, whichever day is suitable, or sometimes a day in the near future.

Can I use any day in formal writing?

Yes. Any day is perfectly appropriate for formal, academic, professional, and everyday writing.

What is the difference between any day and anytime?

Any day refers specifically to a day, while anytime generally means at any time.

For example:

You can come any day.
You can call anytime.

Is any day two words?

Yes. In standard English, any day is written as two separate words.

Which is correct: “anyday now” or “any day now”?

The standard expression is “any day now.”

Example:

The results should be announced any day now.

Conclusion

When choosing between anyday or any day, the correct standard form is any day. It is written as two words when you mean an unspecified day, whichever day is suitable, or a day in the near future.

Although anyday may occasionally appear in informal online writing, it is best avoided in formal and professional English. Remember the simple rule: day stays separate—any day.

Whether you’re writing an email, academic assignment, website article, or everyday message, using any day will keep your English clear, standard, and grammatically appropriate.