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Recently, while analyzing customer records, I encountered customer termination dates of March and April of 1900. Clearly, those were the remnants of dead Y2K bugs. While the operational systems of most enterprises were fixed, some historical databases which had 2-digit dates were left alone. When those 2-digit dates are moved from one system/database to another, errors like the one I got are likely.

It is likely that some data miners will encounter Y2K "mines" in historical date fields for quite some time. The latest KDnuggets poll aims to measure the prevalence of Y2K bugs by asking, In your current practice, what percent of date fields are still affected by Y2K bug?

Please vote at http://www.kdnuggets.com