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Flag Day

   Also found in: Dictionary/thesaurus, Wikipedia 0.07 sec.
Flag Day, anniversary of the adoption of the American flag in 1777. It is celebrated on June 14 but is not a legal holiday.
(jargon)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.
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won the city's 2004 Community Service Award on Flag Day.
Community service recognized .. by DAV Magazine
09 THUR 10 FRI 11 ^ SAT 12 ^ SUN 13 MON 14 June 14 # TUE Flag Day 15 WED 16 THUR 17 FRI 18 ^ SAT 19 ^ June 19 # SUN Father's Day 20 June 20, 1993 @ MON The 24th Marine Expeditionary Unit returned to Mogadishu, Somalia, to help United Nations forces maintain peace in the war-torn country.
Calendar by Marines Magazine
Remarks at the Flag Day ceremony, Andrews Air Force Base, Md.
The American Flag--a symbol of courage and pride by Air Force Speeches
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