With the latest release of the Drupal Calendar module and using Drupal Views, you can keep track of events easily by year, month and day easily. The following modules are necessary for this functionality:

CCK, required for module Content
http://drupal.org/handbook/modules/cck
Views
http://drupal.org/project/views
Date (with Date API)
http://drupal.org/project/date
Event
http://drupal.org/project/event
Calendar
http://drupal.org/project/calendar

Install these modules in Drupal in the order given above.
With Views module installed include Views UI
With Date module installed, include Date API
With Event module installed, include Basic event, Event All Day and Event Views

Create some new content as Events, provide the start and end dates and times.

Create a View to access these events via the Calendar, a step-by-step guide on setting up Calendar View can be found at:
http://drupal.org/node/133341