Screenshot of the Simile TimelineCalendars and Timelines seem to be sprouting all over the net these days. And they should be. Calendars are becoming more common as a household item for selecting dates. Timelines show the user information in an organized way that lets the user drag the change the date and time with convenience. If you want to see a really slick JS Timeline script, look at this: http://www.simile-widgets.org. These are applications made by MIT Simile Project to enhance the web with existing technologies.
Source (Timeline): http://www.simile-widgets.org/timeline/