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DATEPART

この関数は、年、月、日で指定された特定の日付のDateオブジェクトを返します。

書式

DATEPART ( date_value , format_string , [ week_num_type ] )

引数

引数	説明
date_value	(必須) 日付値
format_string	(必須) 日付のフォーマット文字列
[week_num_type]	(オプション) WEEKNUMの2番目の引数と同じです。

解説

DATEPART関数のフォーマット文字列使用できるキーワードは以下のとおりです。

キーワード	結果	説明
Q	2	四半期番号の数値1桁
QQ	02	四半期番号の数値2桁（先頭にゼロを付ける）
QQQ	Q2	四半期番号の短い形式
QQQQ	2nd quarter	四半期番号の長い形式
w	8,27	週番号（先頭にゼロを付けない）
ww	08,27	週番号（先頭にゼロを付ける）

Qとqは大文字小文字を区別しませんが、wは小文字である必要があります。

フォーマット文字列にキーワードを組み合わせて以下のような結果を取得することができます。

フォーマット	結果
yyyy Q	2021 4
yyyy QQ	2021 04
yyyy QQQ	2021 Q4
yyyy QQQQ	2021 4th quarter
YYYY w	2021 8
YYYY ww	2021 08
MM-yyyy	09-2021

データ型

文字列データを受け入れます。Dateオブジェクトを返します。

サンプル

DATEPART関数は、テーブルシートのグループ化にも使用できます。次のサンプルコードは、テーブルシートのYear Quarterのフィールドに四半期を表示する例です。

sheet.groupBy([
    {
        caption: "Company Name", field: "Customers.CompanyName", width: 160,
    },
    {
        caption: "Year Quarter", field: `=DATEPART([@OrderDate],"yyyyQQQ")`, width: 160,
    }
]);