タイムゾーン対応datetime
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<timefyi-glossary slug="aware-datetime"></timefyi-glossary>定義
明示的なタイムゾーン情報（UTCオフセットまたはIANAゾーン名）を含むdatetimeオブジェクト。タイムゾーン対応のdatetimeは曖昧さをなくし、正確なタイムゾーンをまたいだ日付計算に必要。