Will your computer know whether 00 is 2000, 1900, or 2100?
If the interest on a loan is automatically calculated by computer, when the year becomes 00 this could appear to the computer to require a payment of over 100 years' interest!
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What about historical data?
Even if the computer program is changed to expand date fields to 4-digits, all the archived data will still be stored in 2-digit format, unrecognisable to the now Millennium compliant program. So everything has to be changed, or years of precious historical data become useless.
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Can you be sure you will identify all the fields that need to be changed?
A programmer scanning through many lines of COBOL code is likely to miss key date fields. Although only a small proportion of code includes a date field, in the absence of any reliable electronic means, the programmer will have to read through every single line of code - just in case.
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