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Lone_Ghost_Jinn said: the only thing I've found in a short perusal for Isaac is a chornology for his Positronic and Foundation series.  He starts by using the current date of the common era.  C.E.  Like most scientists.  Then he switches to 1 F.E.  I'm guessing that stands for Foundation Era as that is where it shows up.  Here's the link.

http://www.sikander.org/foundation.php