[1] : WordNet (r) 2.0

flag day
     n : commemorating the adoption of the u.s. flag in 1777 syn: june
         14
see also:
june 14 

[2] : Jargon File (4.3.1, 29 Jun 2001)

flag day n. a software change that is neither forward- nor
   backward-compatible, and which is costly to make and costly to reverse.
   "can we install that without causing a flag day for all users?" this
   term has nothing to do with the use of the word flag to mean a
   variable that has two values. it came into use when a massive change was
   made to the ctss timesharing system to convert from the short-lived
   1965 version of the ascii code to the 1967 version in draft at the
   time; this was scheduled for flag day a u.s. holiday, june 14, 1966.
   the actual change moved the code point for the ascii newline character;
   this required that all of the ctss source code, documentation, and
   device drivers be changed simultaneously. see also backward
   combatability.

   previous versions of this entry described this as a change in
   multics, which was wrong. evidently this confusion arose from the fact
   that the changes were made partly to facilitate multics development
   --esr

   as it happens, the first commercial installation of a computer, a
   univac i, took place on lag day of 1951 --esr


see also:
flag ctss backward combatability multics 

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

flag day
     
         a software change that is neither forward- nor
        backward-compatible, and which is costly to make and costly to
        reverse.  e.g. "can we install that without causing a flag day
        for all users?"
     
        this term has nothing to do with the use of the word flag to
        mean a variable that has two values.  it came into use when a
        massive change was made to the multics time-sharing system
        to convert from the old ascii code to the new one; this was
        scheduled for flag day a us holiday, june 14, 1966.
     
        see also backward combatability, lock-in.
     
        jargon file
     
        1998-01-15
     
     
see also:
flag multics time-sharing ascii backward combatability lock-in 
jargon file 

Day >> D Words
Day, definition of term: Day
day_pag1.html

Day Care >> D Words
Day Care, definition of term: Day Care
day+care_pag1.html

Day Off >> D Words
Day Off, definition of term: Day Off
day+off_pag1.html

Christmas Day >> C Words
Christmas Day, definition of term: Christmas Day
christmas+day_pag1.html

Columbus Day >> C Words
Columbus Day, definition of term: Columbus Day
columbus+day_pag1.html

Boxing Day >> B Words
Boxing Day, definition of term: Boxing Day
boxing+day_pag1.html

Black Flag >> B Words
Black Flag, definition of term: Black Flag
black+flag_pag1.html

Arbor Day >> A Words
Arbor Day, definition of term: Arbor Day
arbor+day_pag1.html

Bastille Day >> B Words
Bastille Day, definition of term: Bastille Day
bastille+day_pag1.html

Armistice Day >> A Words
Armistice Day, definition of term: Armistice Day
armistice+day_pag1.html

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