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特定の日付に対応する、月内の日（1から31）を返します。
DAY( date )
日付引数には、37806.5などの数値、"7/4/2003 12:00"などの文字列、またはDATE(2003,7,4)などのDateTimeオブジェクトを指定できます。
数値、文字列、またはDateTimeオブジェクトデータを受け取り、 数値データを返します。
DAY(A2)
DAY(R2C1)
DAY(366778) 結果： 14
DAY(33239) 結果： 1（33239は1991年1月1日に相当）
DAY("7/4/2003 12:00")
DAY(DATE(2003,7,4))