Error creating command

Getting an ADO error when trying to create a command.  "Conversion failed when converting date and/or time from character string.

I don't normally use commands so I could be doing something wrong.

select
dbo.InvMaster.ConvFactOthUom,
dbo.InvMaster.StockCode,
dbo.SorDetail.SalesOrder,
dbo.SorDetail.MStockCode,
dbo.SorDetail.MStockDes,
dbo.SorDetail.MWarehouse,
dbo.SorDetail.MOrderQty,
dbo.SorDetail.MOrderUom,
dbo.SorDetail.MPrice,
dbo.SorDetail.MDiscValue,
dbo.SorDetail.MStockUnitMass,
dbo.SorDetail.MConvFactAlloc,
dbo.SorMaster.SalesOrder,
dbo.SorMaster.OrderStatus,
dbo.SorMaster.OrderDate

FROM dbo.InvMaster INNER JOIN
dbo.SorDetail ON dbo.InvMaster.StockCode = dbo.SorDetail.MStockCode INNER JOIN
dbo.SorMaster ON dbo.SorDetail.SalesOrder = dbo.SorMaster.SalesOrder

union


select
CompanyY.dbo.InvMaster.ConvFactOthUom,
CompanyY.dbo.InvMaster.StockCode,
CompanyY.dbo.SorDetail.SalesOrder,
CompanyY.dbo.SorDetail.MStockCode,
CompanyY.dbo.SorDetail.MStockDes,
CompanyY.dbo.SorDetail.MWarehouse,
CompanyY.dbo.SorDetail.MOrderQty,
CompanyY.dbo.SorDetail.MOrderUom,
CompanyY.dbo.SorDetail.MPrice,
CompanyY.dbo.SorDetail.MDiscValue,
CompanyY.dbo.SorDetail.MStockUnitMass,
CompanyY.dbo.SorDetail.MConvFactAlloc,
CompanyY.dbo.SorMaster.SalesOrder,
CompanyY.dbo.SorMaster.OrderDate,
CompanyY.dbo.SorMaster.OrderStatus

FROM CompanyY.dbo.InvMaster INNER JOIN
CompanyY.dbo.SorDetail ON CompanyY.dbo.InvMaster.StockCode = CompanyY.dbo.SorDetail.MStockCode INNER JOIN
CompanyY.dbo.SorMaster ON CompanyY.dbo.SorDetail.SalesOrder = CompanyY.dbo.SorMaster.SalesOrder