is it bad luck to flip your calendar a day early?

I don't think so but don't do it, just in case..

I just looked at the Calendar in my room and it's at September '09.

UH,... Not that I'm aware of.... I flip calendars all of the time.

Now let's say that day you skipped was an important event for you such as a doctor appt or maybe an anniversary & you missed it...... Well, yes... you're in big trouble.

Depending on if you BELIEVE it's bad luck then I suppose it is. For example, I well never walk on three drains in a row because I BELIEVE it's bad luck. Also, a well known belief that if you open an umbrella in a building it's bad luck.

Luck is nothing but belief can lead to believing things you do is bad luck or luck.

I'm answer to you're question I personally don't turn over a calendar a day early because I BELIEVE it's bad luck.

I seriously doubt you're going to live long enough to read this answer (the only honest answer here), so I'll just ...

Not if you have nothing else scheduled for today.

There is no such thing as "luck"

that is a common superstition

Just don't do it - it's bad mojo.

no, ofcourse not :) x