I am trying to get into the IB API for Excel, primarily for loading Option Chains for live analysis. In their sample program (TwsDDEbeginner.xls, Options Trader worksheet), GetQuote and LoadChains are failing due to an overflow error in makeid(), specifically id = (Date - 37000) * 1000000 + (Time * 1000000) Has anyone customised makeid() successfully? BTW, thanks to all you traders out there for ET.