Internet Calendar (iCal RFC-2445) Export

If you have installed software that acts as a handler for the webcal protocol, you should be able to click on the webcal link. This should open your calendar software and create a remote calendar link.

If you do not have a webcal protocol handler installed (it does nothing when you click on the link), copy the http:// link onto the clipboard and paste it into your calendar software.

By default, the iCal export routine will follow the calendar's setting of whether to include rollup calendars as part of the exported calendar. If you do not want events from included calendars to be displayed, append ?rollup=0 to the URL.

If your calendar requires a login or the calendar you want to subscribe to is not publicly visible, you can still subscribe to the iCal data from other programs. To do this, add ?username=youruser&password=yourpassword to the URL. For example:

https://www.mhsoftware.com/caldemo/iCal/calendar_id/22.ics?username=demo&password=demo

If you're doing this, you should use SSL for your request. In other words the URL should start with https://.

Additional URL Options

Parameter Name	Description
nodefaultcontact	If this argument is present, and the value is 1, then the event owner will not be added to the iCal entry as the ORGANIZER/CONTACT.
noresourcesindesc	If this argument is present and the value is 1, then the resources used by the event will not be added as text to the event description.
password	Password to use to transparently login to the calendar for access to the data.
username	User Name to use to transparently login to the calendar for access to the data.

Caveats

iCal is a very complex specification and it can be difficult for programs to inter-operate. We are aware of the following issues:

Windows Calendar (Vista)	No known issues.
Evolution (2.8.2)	Specific Date (RDATE) events do not work.
Apple iCal	All Versions (2.0-4.0) RDATE (Specific Dates) does not work. If time zone support is enabled, the detailed event display shows one time events relative to GMT. Version 3.06 Last Weekday does not work. Version 2.05 Last Weekday does not work. The mere presence of an RDATE entry can cause iCal to terminate with an error. First Weekday does not work.
KOrganizer (4.1.0)	KOrganizer 3.x doesn't handle time zones correctly. Unless all events are in the same time zone, times will be wrong. This is certain to happen because Connect Daily exports one time events in GMT. Versions 3.5.7 and later will handle one time zone and GMT correctly, but not two time zones and GMT. As a general note, KOrganizer converts times for recurring events into GMT and stores them. This can cause problems with recurring event calculations.
Microsoft Outlook (2000-2003)	There are two methods of importing events into Outlook. Double-clicking on an individual ICS file or using the import screen. If you double click on an ICS file, or URL for an ICS file, then only one event from that file will be imported and most forms of recurrence won't work. If you use the Import screen to import an ICS file, then things will work pretty smoothly.
Mozilla Sunbird 0.9	First Weekday, Last Weekday don't work because BYSETPOS isn't implemented.
PHPiCalendar 2.23 rc1	Specific Date events (RDATE) don't work.