Contract Front Month Rule

Could one of you guys write a single paragraph summarizing what you've just discussed that fully defines how to determine expiration and rollover dates, with consideration of all possible combinations of monthly starting days and holidays? I don't think I've ever seen such a description. Thanks! (Then we won't have to keep reproducing this thread every 3 months.)
 
dkamp,

I guess the final conclusion is this:

Front month is the trading day before the second Friday of the expiration month.

Ofcourse there are special circumstances as we saw in September.
 
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