Some programs were made Y2K-compliant by continuing to use two digit years, but picking an arbitrary year prior to which those years are interpreted as 20 xx, and after which are interpreted as 19 xx. In the last few months before the year 2000, two other date-related milestones occurred that received less publicity than the then-impending Y2K problem.įollow-on problems caused by certain temporary fixes to the Y2K problem will crop up at various points in the 21st century. The Domain/OS clock, which is based on the number of 4-microsecond units that has occurred since 1 January 1980, rolled past 47 bits on 2 November 1997, rendering unpatched systems unusable. Values on and after this day do not fit into a signed 16-bit integer, but overflow and return negative values. On 18 September 1989, these programs began to fail, the date being exactly 32,768 (2 15) days since the zero date. Some mainframe programs were written to encode dates as the number of days since a 'zero date' of 1 January 1900, storing them as signed 16-bit binary integers. ( December 2021) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed.

Please help improve this section by adding citations to reliable sources. This was recognized when the later COS-310 operating system was developed, and dates were recorded differently. The Digital Equipment Corporation OS/8 operating system for the PDP-8 computer used only three bits for the year, representing the years 1970 to 1977. There were numerous problems and crashes related to this bug while an alternative format was developed. On 4 January 1975, the 12-bit field that had been used for dates in the DECsystem-10 operating systems overflowed.

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