14. Specialized Widgets

You are developing a task management tool where each task requires both a start datetime and a due datetime. You use QDateTimeEdit with its built-in calendar popup enabled to let users select full date-and-time values in one convenient widget.

You want to provide a full visual monthly calendar in your application so users can browse dates and see which days contain scheduled events. You implement QCalendarWidget and customize it with QTextCharFormat to highlight important dates.