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Title: HCalendar  
Author: World Heritage Encyclopedia
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Subject: Infobox film awards, Infobox film awards/doc, Infobox film awards/sandbox, Infobox date field metadata/doc, Microformats
Collection: Microformats
Publisher: World Heritage Encyclopedia


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[1] 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 1
  • Accessibility concerns 2
  • Geo 3
  • Attributes 4
  • Users 5
  • References 6
  • External links 7


Consider this semi-fictional example:

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

The HTML mark-up might be:

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

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

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

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[2] 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. Work is underway to find an alternative method of presenting ISO8601 date-time information.[3]


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.


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


Notable organisations and other websites using hCalendar include:


  1. ^ Browser Support for Microformats
  2. ^ Web Standards Project, hAccessibility: Abbreviations in Microformats
  3. ^ Microformats Wiki: Assistive Technology
  4. ^ Microformats - Birmingham City Council
  5. ^ Protalinski, Emil (2011-02-18). "Facebook adds hCalendar and hCard microformats to Events". ZDNet. Retrieved 24 March 2011. 
  6. ^ Official Google Maps API Blog: Microformats in Google Maps
  7. ^ Google adds support for hCalendar and hRecipe Rich Snippets
  8. ^ Google Webmaster Tools: Rich snippets - Events
  9. ^ David Storey - Microformats on Opera sites
  10. ^ a b c d e hCalendar Examples in the wild · Microformats Wiki
  11. ^

External links

  • hCalendar at the Microformats Wiki
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