This article describes how to extend the default calculation engine in JavaScript by implementing a custom calculation engine using the Aspose.Cells library for JavaScript via C++. Load an existing Excel file or create a New one to use the methods provided and save the modified Excel file....disabled = false ; }); // Create a new class derived from AbstractCalculationE...CellsHelper . getDoubleFromDateTim ( new Date (), false ) + 1.0 ; } }...