Though it might seem like we’re focusing on only two sets of words here, this proofreading tip provides some base knowledge about compound words, adverbs and adjectives. 

“Every day” and “any time” are phrases that are sometimes placed together as compound words used as adjectives or adverbs. 

On their own, though, they refer to exactly what they look like:

Example: Every day I’m hustlin’. Here, “every day” is a phrase that means each day. 

Example: I don’t have any time to give her a blood test. OR We can do the call at any time. Here, “any time” is a phrase that implies or prompts specificity. 

Together, they can take on different meanings: 

Example: He was wearing everyday clothing. Here, “everyday” is used as an adjective and means ordinary or average.

Example: Call me anytime. Here, “anytime” is an adverb that means “whenever.”

A good rule of thumb:

For every day vs. everyday, if you can replace “every” with “each” then you should be using “every day.” You would never use “eachday.”

For any time vs. anytime, if you’re using “at” before it, it should be “any time.” Technically, “anytime” is informal, and if you’re unsure, it’s better to go with “any time.”

— Sarah Muench