Ask what his definition of "6 day creation" is. Maybe his definition is super-specific, and he knows Calvin taught a creation "week", he's just excluding Calvin on some definitional basis he created. Maybe he's equating "6-day" with "young earth-6000 years" and he thinks he can show Calvin wasn't committed to the latter. He'd still be wrong, but...
Read Calvin's commentary, and you can hardly miss his position on the days.
As for Darby's "invention" -- that is easily disproved. Note this article:
Creation Science and Christianity at Reformed.org
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Rev. Bruce G. Buchanan
ChainOLakes Presbyterian Church, CentralLake, MI
Made both Lord and Christ--Jesus, the Destroyer
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