POSIX時間
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<timefyi-glossary slug="posix-time"></timefyi-glossary>定義
Unix時間と実質的に同じ — 1970-01-01T00:00:00Zからの経過秒数。POSIXは各日を正確に86,400秒と定義し、うるう秒を意図的に無視している。