Flag day (software)

Flag day (software)

Flag day, as used in software engineering, is a change which requires a complete restart or conversion of a sizable body of software or data. The change is large and expensive, and—in the event it doesn't work—reversing the change is similarly difficult and expensive. cite web
url = http://www.catb.org/jargon/html/F/flag-day.html
title = flag day
accessdate = 2008-09-22
]

This usage originates from such an obscure change in the Multics operating system's definition, which was scheduled for the U.S. holiday, Flag Day, on June 14, 1966.

Another flag day was January 1,1983: when the ARPANET changed from NCP to the TCP/IP protocol suite.

References


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