Shane,

> The problem I have is that even though I can covert the type to a date/time in the other controls, I can not display the values as a time/date in the grid. The value is actually derived from a calculation and is a double.

have a look at TField.OnGetText/OnSetText; since you are using the
TDataSet-compatible flavour of IBObjects, these events should be
available (don't know if a native counterpart exists, but I would bet
something on these lines must be in place somewhere).
HTH
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_/\/ando