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Luzi Schucan

Country: Switzerland
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iCalendar Trick

iCalendar support can be added to TWiki very easily. Any suggestions are welcome any time!


Apply the RFC2445 to any date list (like a calendar). This can be done with just a topic, applied with the standard "text" skin.



For topics with Date fields

If you have topics with a date field of any sort (bug tracking items, to-do items, Milestone documents etc.), you can have them replicated to your iCal client. For this example, let's assume you have Milestone documents with a 'Date' form field:

Create a topic with this content this content (hide):

%SEARCH{"(form.name= 'MilestoneForm')" nonoise="on" format="BEGIN:VEVENT$n()DTSTART;VALUE=DATE:$percntCALC{$FORMATTIME($TIME($formfield('Date')),$year$month$day)}$percnt$n()UID:Intranet-$web.$topic@%HTTP_HOST%$n()SUMMARY:$formfield('Name')$n()DESCRIPTION:Link to intranet page: \n%SCRIPTURL{"view"}%/$web/$topic$n()END:VEVENT" order="formfield(Date)" type="query"}%


  • the UID must be unique within one iCal file
  • the SEARCH string and type can of course be anything you like

With the calendar plugin

Unfortunately, I couldn't get the above trick to work as easily with the TWiki:Plugins/CalendarPlugin. Here's something that works in some cases:

Your help is much appreciated!

Create a topic with this content this content (hide):

X-WR-CALNAME:%WIKITOOLNAME%: %TOPIC%%CALENDAR{topic="[comma separated web.topic list]" aslist="1" days="[number of days to include]" datenumberformat="$n" format="BEGIN:VEVENT$nDTSTART;VALUE=DATE:$year$mo$day$nUID:$year$mo$day$description$nSUMMARY:$description$nEND:VEVENT"}%


  • in this way, the UID might sometimes not be unique
  • the $description variable might sometimes contain HTTP links which won't look nice in your calendar - is it possible to turn links off through a template?
  • it would be great if the CALENDAR variable would have a more standard format argument.

Open issues:

  • I am not sure what happens if you have several events on a same day, or multi-day events. Does anybody have the time to test?
  • I tried to make the UID unique with a counter through the use of the TWiki:Plugins/SpreadSheetPlugin, but failed. Any ideas?

Client setup

Once this is all done, all you need to do is fire up your favorite iCal client and enter the page's address, with the skin=text parameter. Example: http://twiki.org/cgi-bin/view/Main/LuziSchucan?skin=text


This setup has been tested successfully with Mac OS X and the iCal application, Linux and Evolution, and Windows and Thunderbird+Lightning over an https connection with mandatory login credentials.

I appreciate any reports of other tests!

Other Stuff

Luzi's contributions

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Note: if personal data is being stored using a secret database, then it is only visible to the user and to administrators.


My Personal Preferences

Uncomment preferences variables to activate them (remove the #-sign). Help and details on preferences variables are available in TWikiPreferences.

  • Show tool-tip topic info on mouse-over of WikiWord links, on or off:
    • #Set LINKTOOLTIPINFO = off
  • Set ALLOWTOPICCHANGE = LuziSchucan

Related Topics

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Topic revision: r4 - 2008-04-28 - LuziSchucan
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