Anytime vs. any time . Any time is a common and straightforward noun phrase that means exactly what it seems like it does based on its component parts. Importantly, it functions as a noun, often in prepositional phrases with the preposition at, as in Feel free to call at any time.But it also commonly appears by itself (without at), as in Any time is a good time for cake. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.