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SUBMIT YOUR IDEAI spent some extra time playing around with this one to make it work with a single formula.
REGEX_Replace(
(if Left([date], 1) = "1" Then REGEX_Replace([date], "(1)(?:\d{6})", "20")
elseif Left([date], 1) = "0" Then REGEX_Replace([date], "(0)(?:\d{6})", "19")
ELSE "Blank" endif)
+
right([date],6),
"(.{4})(.{2})(.{2})", "$1-$2-$3")