It is a possibility. You never know.I certainly can see a Eberron calendar someday, it being the rising star. The 12 moons would be a real challenge for the phases of moon part.
Dragonlance....maybe. Hard to say on that one, since elements of Dragonlance are with WOTC (novels, campaign setting) and others with Sovereign Press (adventures, supplements)
Edit: There you have it....an Eberron calendar already exist. Silly me.
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