Final answer:
The keyword 'now' in Python or 'Date()' in JavaScript is used to return the value of the current date on a computer, replacing traditional physical calendars.
Step-by-step explanation:
The keyword used to return the value of the date according to the computer is now in some programming languages, such as Python (with the datetime module), or Date() in JavaScript. This functionality is crucial for various applications across programming and software development, particularly those dealing with digital calendars or requiring time-sensitive operations.
Understanding how to retrieve and manipulate the current date and time is an integral skill in coding. Since the inception of digital technology, this ability has replaced the traditional methods of tracking time, such as using physical calendars.