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It was sent January 16, 1917, but made public in March 1, 1917
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This was ratified August 18, 1920 (proclaimed August 26, 1920)
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It also went through the 21, so it lasted 2 days.
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August 6, 1945 (Hiroshima); August 9, 1945 (Nagasaki)
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It started the 16 and ended the 28.
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First identified December 2019; declared a global pandemic March 11, 2020; then declared over May 5, 2023