No particular time, as in It doesn't matter when; any day is fine with me.
Also, any day now. Quite soon, as in I might get a call any day, or There could be a snowstorm any day now.
Also, any day of the week. Every day, as in I could eat fresh corn any day of the week. All three senses employ any in the sense of “no matter which,” a usage dating from a.d. 1000.
DO YOU KNOW THIS VOCABULARY FROM "THE HANDMAID'S TALE"?
Words nearby any day
Example sentences from the Web for any day
He also seems to think lynching an any-day possibility in the streets of New York.The Land of Contrasts|James Fullarton Muirhead