What is meant by "compliant?" There is the lawyers' definition, which varies in terms of whether he is paid by the defense or the plaintiffs. Here is a definition that is accepted by banks and IATA.
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This document addresses what is commonly known as Year 2000 conformity (also sometimes known as century or millennium compliance). It provides a definition of this expression and requirements that must be satisfied in equipment and products which use dates and times. It has been prepared by British Standards Institution committee BDD/1/-/3 in response to demand from UK industry, commerce and the public sector. It is the result of work from the following bodies whose contributions are gratefully acknowledged: BT, Cap Gemini, CCTA, Coopers & Lybrand, Halberstam Elias, ICL, National Health Service, National Westminster Bank. . . . .
Year 2000 conformity shall mean that neither performance nor functionality is affected by dates prior to, during and after the year 2000. In particular:
Rule 1. No value for current date will cause any interruption in operation.
Rule 2. Date-based functionality must behave consistently for dates prior to, during and after year 2000.
Rule 3. In all interfaces and data storage, the century in any date must be specified either explicitly or by unambiguous algorithms or inferencing rules.
Rule 4. Year 2000 must be recognized as a leap year.