This article describes how to extend the default calculation engine in Node.js by implementing a custom calculation engine using the Aspose.Cells library for Node.js via C++. Load an existing Excel file or create a new one to use the methods provided and save the modified Excel file....day to the system date. So, if the current date is 27/07/2023, then...add a one‑day offset to the date data . setCalculatedValue (...