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Wikipedia / HCalendar

hCalendar (short for HTML iCalendar) is a microformat standard for displaying a semantic (X)HTML representation of iCalendar-format calendar information about an event, on web pages, using HTML classes and rel attributes.

It allows parsing tools (for example other websites, or browser add-ons like Firefox's Operator extension) to extract the details of the event, and display them using some other website, index or search them, or to load them into a calendar or diary program, for instance. Multiple instances can be displayed as timelines.

Example

Consider this semi-fictional example:

  The English Wikipedia was launched
  on 15 January 2001 with a party from 
  2-4pm at 
  Jimmy Wales' house 
  (more information).

The HTML mark-up might be:

hCalendar mark-up may be added using span HTML elements and the classes vevent, summary, dtstart (start date), dtend (end date), location and url:

Note the use of the abbr element to contain the machine readable, ISO8601, date-time format for the start and end times.

Accessibility concerns

Concerns have been expressed that, where it occurs, the use of the abbr element (using the so-called abbr-design-pattern) in the above manner causes accessibility problems, not least for users of screen readers and aural browsers. The newer h-event microformat therefore uses the HTML5 element time instead:

Geo

The Geo microformat is a part of the hCalendar specification, and is often used to include the coordinates of the event's location within an hCalendar.

Attributes

For a full list of attributes, see the hCalendar cheat-sheet.

Users

Notable organisations and other websites using hCalendar include:

References