What parameters are required to create an "Add to Google Calendar" link?

We can use this link to add a new event to Google Calendar by parameters

https://www.google.com/calendar/render?
action=TEMPLATE&
text=EventName&
dates=20131206T050000Z/20131208T060000Z
&location=EventLocation&
sprop=name:Name&
sprop=website:EventWebite&
details=EventDetail&
sf=true&
output=xml

But I can't find any documentation about these parameters.

Does anyone know where's it?

Solution 1:

Explanation about the available parameters:

anchor address:
http://www.google.com/calendar/event?
This is the base of the address before the parameters below.


action:
    action=TEMPLATE
    A default required parameter.
    
src:
    Example: src=default%40gmail.com
    Format: src=text
    This is not covered by Google help but is an optional parameter
    in order to add an event to a shared calendar rather than a user's default.
    
text:
    Example: text=Garden%20Waste%20Collection
    Format: text=text
    This is a required parameter giving the event title.
    
dates:
    Example: dates=20090621T063000Z/20090621T080000Z 
           (i.e. an event on 21 June 2009 from 7.30am to 9.0am 
            British Summer Time (=GMT+1)).
    Format: dates=YYYYMMDDToHHMMSSZ/YYYYMMDDToHHMMSSZ
           This required parameter gives the start and end dates and times
           (in Greenwich Mean Time) for the event.
    
location:
    Example: location=Home
    Format: location=text
    The obvious location field.
    
trp:
    Example: trp=false
    Format: trp=true/false
    Show event as busy (true) or available (false)
    
sprop:
    Example: sprop=http%3A%2F%2Fwww.me.org
    Example: sprop=name:Home%20Page
    Format: sprop=website and/or sprop=name:website_name

add:
    Example: add=default%40gmail.com
    Format:  add=guest email addresses

details: (extra)
    Example: details=Event%20multiline%0Adetails
    Format:  details=description text (google also accepts html in this text)

http://useroffline.blogspot.com/2009/06/making-google-calendar-link.html

Solution 2:

The link from snoopy_15's answer points to an old Google URL that is currently being redirected to the new Google support page. This new page does not explain how to generate the kind of link asked in this question.

However, thanks to the wonders of Internet Archive: Wayback Machine, the older pages are still archived and available!

The latest available version is from March 2012, and it includes a form with a simple JavaScript code that still works! Sure, this is not an official documentation (and I'm still looking for one), and this is not even a documentation (it is an interactive form with a script), but it is the closest I could get.

Solution 3:

These are the parameters that I use when I create these links. There are other parameters that exist, but I don't find them useful and they are optional. The details about how the dates work are particularly vexing and were never sufficiently documented by google.

• action=TEMPLATE (required)
• text (url encoded name of the event)
• dates (ISO date format, startdate/enddate - must have both start and end time or it won't work. The start and end date can be the same if appropriate.)
  • to use the user's timezone: 20161208T160000/20161208T180000
  • to use global time, convert to UTC, then use 20131208T160000Z/20131208T180000Z
  • all day events, you can use 20161208/20161209 - note that the old google documentation gets it wrong. You must use the following date as the end date for a one day all day event, or +1 day to whatever you want the end date to be.
• details (url encoded event description/details)
• location (url encoded location of the event - make sure it's an address google maps can read easily)

Solution 4:

You have one more param for specifying Guests

Add:
    Example: add=default%40gmail.com
    Format:  add=guest email addresses

Demo

https://productforums.google.com/forum/#!topic/calendar/Ovj6BNTQNL0