dateとtime（日付と時刻）
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dateコマンドを使用してBashで日付と時刻を操作する方法
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echo date in php Code Example
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datetime object to string php Code Example
PHP Date/Time
dateコマンドを使用してBashで日付と時刻を操作する方法
PHPで日付や曜日の取得と表示や改行コードの使い方 | Free Style
