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GoogleSpreadSheetでunixtimestampを出す方法@日本

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メモ書きです。

GoogleSpreadSheetでUNIXTIMEを出す関数がなかったっぽいので
無理やり書きました。

2015年3月6日21時10分@日本だとすると以下のような書き方。
=(DATEDIF(DATE(1970,1,1), INDEX(DATE(2015, 3,6), "D") * 60 * 60 * 24 + HOUR(21) * 60 * 60 + MINUTE(10) * 60 - 9 * 60 * 60)

時差(-9時間)を考慮すると計算があいます。
日本以外で使った場合の考慮などはしてないので注意。

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