The HTML markup produced by this template includes an hCalendar microformat, which makes the event details parsable by computers, either acting automatically to catalogue article across Wikipedia, or via a browser tool operated by a person, to (for example) add the subject to a calendar or diary application. For more information about the use of microformats on Wikipedia, please see the microformat project.

Dates will only be included if you use {{Start date}} or {{End date}} (use the former for single dates). As an alternative, you may use {{Start-date}} and {{End-date}}.

hCalendar uses HTML classes including:

  • attendee
  • contact
  • description
  • dtend
  • dtstart
  • location
  • organiser
  • summary
  • vevent

Please do not rename or remove these classes; nor collapse nested elements which use them.

Pages which use multiple instances of this template can also use {{UF-timeline}}, in their external links section, to generate a SIMILE timeline. It renders as: