It's called Apple Day but in practice it's more like Apple Month.

这个节日被称为“苹果日”，但是实际上它更像是“苹果月”。

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An apple a day.

一天吃一个苹果。

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An apple a day keeps doctors away.

一天一苹果，疾病远离我。

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Now I have a reason to say an apple a day keeps the doctor away.

BBC: Hidden benefits for apple-eaters

Streettalk even learned of one hedge fund in New England that ONLY trades Apple all day long, and is even by days end.

FORBES: The Battered Investment Class Has No Confidence in Markets, Companies, Banks, Governments

Authorities say the 40-year-old Miller, while employed as an institutional sales trader for Rochdale Securities LLC of Stamford, conspired with another individual to execute a trade to buy 1.6 million shares of Apple stock on behalf of a Rochdale customer whose account Miller handled on the day Apple was scheduled to announce earnings.

WSJ: NY trader pleads guilty in $1B Apple stock scheme