Flag day

Post celebrating Flag Day in 1917.

Flag Day is a holiday celebrated on June 14 in the United States. It commemorates the adoption of the flag of the United States on June 14, 1777 by resolution of the Second Continental Congress.[1] The Flag Resolution stated "That the flag of the thirteen United States be thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new constellation."

Flag Day was first proposed in 1861 to rally support for the Union side of the American Civil War. In 1916, President Woodrow Wilson issued a presidential proclamation that designated June 14 as Flag Day.[4] On August 3, 1949, National Flag Day was officially established by an Act of Congress. On June 14, 1937, Pennsylvania became the first state to celebrate Flag Day as a state holiday, beginning in the town of Rennerdale. New York Consolidated Laws designate the second Sunday in June as Flag Day, a state holiday.

Flag Day is not an official federal holiday. Federal law leaves it to the discretion of president to officially proclaim the observance. Title 36 of the United States Code, Subtitle I, Part A, Chapter 1, Section 110 is the official statute on Flag Day. The United States Army also celebrates its birthday on this date.

Information Technology

A flag day, as used in system administration, 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 of failure—similarly difficult and expensive to reverse.

The situation may arise if there are limitations on backward compatibility and forward compatibility among system components, which then requires that updates be performed almost simultaneously (during a "flag day cutover") for the system to function after the upgrade. This contrasts with the method of gradually phased-in upgrades, which avoids the disruption of service caused by en masse upgrades.

This systems terminology originates from a major change in the Multics operating system's definition of ASCII, which was scheduled for the United States holiday, Flag Day, on June 14, 1966.

Another historical flag day was January 1, 1983, when the ARPANET changed from NCP to the TCP/IP protocol suite. This major change required all ARPANET nodes and interfaces to be shut down and restarted across the entire network.

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