2020-11-06 VB.netで日付をシリアル値に変換 Dim today As Date = DateTime.Today Console.WriteLine(today.ToOADate)整数部が年月日、小数部が時間になる ネタ元 https://www.atmarkit.co.jp/ait/articles/1709/06/news020.htmlhttps://tmg0525.hatenadiary.jp/entry/2017/09/14/143939
