shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ MySQL mysql> select adddate(now(), 1); +---------------------+ | adddate(now(), 1) | +---------------------+ | 2014-05-27 23:19:29 | +---------------------+ 1 row in set (0.00 sec) mysql> select adddate(now(), -1); +---------------------+ | adddate(now(), -1) | +---------------------+ | 2014-05-25 23:19:3… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F2014%2F05%2F26%2F%25E6%2597%25A5%25E4%25BB%2598%25E8%25A8%2588%25E7%25AE%2597" title="日付計算 - by shigemk2" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2014-05-26 23:22:48 rich https://www.shigemk2.com/entry/2014/05/26/%E6%97%A5%E4%BB%98%E8%A8%88%E7%AE%97 1.0 100%