You would think. Any data entry form containing year should always be 4 digits. Once it gets to the programmer, there is generally no way of knowing whether a two-digit year is in the 1900s or 2000's. The problem is when you have a massive database, the data are being entered at different places using different systems. I used to manage a database with substance abuse treatment admissions from about 20 different states. All states had the same variables, but each state had it's own way of formatting variables. Then when you finally get them on the same page, one of the states decides to do it differently the next year.