The calendar is not displaying other dates

The calendar doesn’t display dates that are not the actual day, for example, today is April 30th, it wont display other activity that is not that day, it doesn’t let see other days stuff, and when selecting other day it redirects to the actual day.

When having the week display, it doesn’t show the activities.
And when selecting the month and year display it doesn’t display any activity.

You’ll need to provide more information on your environment, screen shots, logs data, php error logs, tried debugging it?