夏時間の歴史
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<timefyi-glossary slug="daylight-saving-time-history"></timefyi-glossary>定義
1784年にベンジャミン・フランクリンが最初に提案し、第一次世界大戦中に燃料節約のため広く実施された。韓国では1948〜1951年と1955〜1960年に短期間採用された。