How to Create “Add to Calendar” Link on Web Page for iPhone

Question

Many calendaring programs (Outlook, iCal) support vCal for downloading event information and adding it to your calendar. Others can use the vCalendar microformat to extract

Answer 1

Update:
Note that this is a very old answer. Since iOS 5 you can use EKEventStore to access calendar events and Mobile Safari will open .ics files in Calendar.

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Original Answer
It's not possible, there is no API for the calendar on the iPhone, sadly. You can build an app that registers for the ical URL scheme, but you still won't be able to save the calendar entries to the calendar backend since there is no API (like e.g. for the AddressBook).

Answer 2

As of iOS 5, if you create a http link to an .ics file, Mobile Safari will offer to open it up in Calendar.

Answer 3

One resolution could be (from iPhone OS 3.0):

• estabilish a calendar server (webdav or caldav protocol), create accounts, events...
• subscribe your iPhone Calendar to one of the accounts (eg. Settings->Mail, Contacts, Calendars->Add Account…->Other, Add CalDAV Account -> server, account details)
• your web based app posts calendar entries into the adequate calendar server account

Alternatively use Google Calendar to post entries from your website, which can be easily synched to iPhone Calendar using CalDAV.

Another usefull link: http://blog.fosketts.net/2009/06/17/subscribe-internet-calendars-iphone-30/