I've come across the phrase "to have a flag day." From context it's clear that it's not talking about any kind of celebration of a literal flag, rather, it seems to refer to a synchronization point for a process or community; at a pre-arranged time, everyone agrees to make a coordinated change.

Is this correct? If so, how did it come to mean this?

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    Could you tell us the actual context, and what research you have done yourself? – TimLymington Dec 4 '18 at 21:12

"Flag day" is technical jargon for a major coordinated change. It's usage in this sense refers to a particular instance of such change which took place on June 14, 1966, US Flag Day of that year.


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