Controller-Bound Formatter Function
A date formatter in SAPUI5 is a utility function used to convert and display date values in a human-readable or locale-specific format within an application's user interface. Developers use it to transform raw date data — typically retrieved from a model — into a formatted string suitable for display in UI controls. As shown in Step 16: Adding the Date Formatter, the formatter is applied as part of data binding to ensure dates are presented consistently and meaningfully to the end user.