The phrase "on any specific day" is correct and usable in written English.
You can use it when referring to a particular day without specifying which one.
Example: "We can schedule the meeting on any specific day that works for you."
Alternatives: "on any particular day" or "on any given day".
Recently featured in the TechCrunch Radio Pitch-Off, WeatherPlanner is a year-ahead weather service that will tell you what the weather will be like on any specific day for the next year.
If neither of the methods provide any clues, check your Google Analytics traffic and look for a sharp drop in organic search traffic on any specific day between now and April 2012.
All questionnaire measures related to the owner's assessment of the frequency or intensity of behaviours over the previous two weeks rather than on any specific day.
An example price list for photons that match the market on any specific day (what players are willing to pay in order to move items quickly) are included in the tips section.
Frost damage for any specific day of the season was assumed to occur when the minimum temperature on that day was below the specific lethal temperature for the phenological stage predicted at that moment (based on phenological models).
Hospital staff then refused to attend to her, insisting that patients referred from her clinic were only attended to on one specific day of the week.
They take the value 1 on a specific day d around a month end and 0 on other days.
Want to reserve a seat in a no-smoking carriage on a specific train on a specific day?
And for those who don't mind paying a premium, Federal Express will guarantee a specific time on a specific day.
"It's not as if politicians never mess things up on a specific day or at the dispatch box.
These screenings will be offered at different times in each theater, rather than being live broadcasts on a specific day at a specific time.
