CalConnect XLIV - February 4-8, 2019

CalConnect XLIV in Zürich, Switzerland, hosted by Google
Monday, February 04, 2019 to Friday, February 08, 2019
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Recent Changes: 

29 Jan 2019 Additional schedlule adjustments

22 Jan 2019 Schedule adjustments; Conference calendar .ics file created.

21 Jan 2019 Location section updated with inormation about gaining access to the building, getting your badge, and finding the meeting room  Schedule updated to include information about Thursday Conference dinner.

15 Jan 2019 Updated Conference Schedule and Sessions; added link to Testing Plans to Introduction

19 Dec 2018 First Draft of Conference Schedule and Sessions added

27 Nov 2018 Additional Hotel (Hotel Züri) added to Lodging section.

22 Nov 2018 Meeting location updated to include street address.

CalConnect XLIV will be held in Zürich, Switzerland, the week of February 4-8 2019, hosted by Google in  Zürich, Switzerland (see the Location tab on this page).  In addition to our usual conference, we will host an Open Codefest on Monday February 4th prior to the conference, and a Public Workshop on Time Zones on Tuesday afternoon during the conference.

CalConnect Public Codefest:  Monday February 4th will be an all day (0900-1730) Open Codefest / Hackathon taking place at the Google facility.  This event is open to the public but you must register in advance.  Note that catering will not be provided. There is no fee for the Codefest. You may register for this event at  CalConnect conference attendees must register separately to attend the Codefest.

CalConnect Public Time Zone Workshop:  The Time Zone Workshop will be Tuesday February 5th from 13:30 to 17:30 at the Google facility.  This workshop will be focussed on the potential impact of EU Summer Time changes and how the changes might be mitigated; please see our news release.  The workshop is open to the public but you must register in advance.  There is no fee to attend the workshop.  Attendees are invited to stay for a Welcome Reception following the workshop.  More information will be provided as planning continues.  Please register for this event at CalConnect conference attendees are requested to register for this workshop via the eventbrite link in addition to registering for the conference itself (see below). 

CalConnect XLIV Conference: The conference will be Tuesday-Friday February 5-8 at the Google facility.  This event will be organized in our new conference format and brings together, as a single event and with a single fee, our traditional conference and technical sessions.  Note that the "track" organization at the September 2018 event will not be used; we will organize sessions for best fit and relevance.  Additional changes to the structure and format will be made in accordance with feedback from the previous "one time" event in Karlsruhe.  CalConnect XLIV is open to members, and to non-members as observers.  You must register in advance and pay the registration fee for the conference. Please register for the confernce at

Interoperability Testing at CalConnect XLIV:  If you are interested in or planning to test at this event, please visit this document:  TESTING PLANS.  On that page you should  provide name, e-mail address, organization, what you want to test (e.g. CalDAV basic, Autodiscovery, etc.) and (if possible) who you want to test with.  If you cannot access the page please e-mail Test Request with the above information (and to let us know you don’t have access).

This will help us to plan for and organize testing, and also encourage other organizations attending the event to test.

International Visitors 

U.S. citizens and those of many other countries do not require a visa to enter Switzerland, although a passport will be needed.  For more information please see

Conference Details 

We will begin each day at 0830 (rather than 0800 as in the past) with coffee and tea..  The first session will be at 0900. The default end for each day is now 1730.

Morning coffee and tea will be accompanied by fruit or rolls; however, you should plan to have your real breakfast prior to arriving at the venue.

Registration Information 

Registration is now open for CalConnect XLIV; please see to register.  There is only one registration and one payment per person for the entire event.


CalConnect XLIV and related events will be held at the Google Zürich Europaallee campus,  Building H, Lagerstrasse 100, which is about 5 minutes from the Zürich Central Train Station.  We will be in Meeting Room Heidi on the 2nd Floor

Come to the main door of 100 Lagerstrasse on the SE corner.  There is a "door bell" which will give you access to the building.  Go to the second floor and check in with Reception to get your badge. The meeting room is right next to Reception.  

Please see this map of central Zürich and the area of the Central Train Station:


If you travel by air, the easiest connection is via Zürich International Airport (ZRH)

From the airport, the easiest way to get to central Zürich is by train; there is a direct train to the Zürich central train station every 5-10 minutes which takes about 10-15 minutes.   Fare is from 3.40 CHF.  

You may also use the EuroAirport train from Basel-Mulhouse-Freiburg (MLH/SL/EAP) which takes about 1.5 hours.

Train connections are also plentiful from nearby countries such as Germany, France, Italy and Austria. 




Google does not have a corporate rate at local hotels, so please book your hotel directly.  Four choices are shown below in order of increasing distance from the venue. 

The Conference Hotel is the 24hours Hotel Langstrasse, across the street from the meeting venue:
25hours Hotel Langstrasse
Langstrasse 150
Zurich, 08004 Switzerland
For early February 2019, a room with breakfast for Sunday through Friday is about 225 CHF inclusive per night.

Several blocks from the venue, east of the central train station:
Hotel St. Gotthard
Bahnhofstrasse 87
Zürich 8001 Switzerland
+41 (0) 44 227 77 00
For early February 2019, a room with breakfast for Sunday through Friday is about 246 CHF inclusive per night

About a mile from the venue on the far side of the central train station (tram service is available):
Hotel Züri by Fassbind
Heinrichstrasse 254
Zürich 8005, Switzerland
+41 44 44 8 18 18
For early February 2019, a room with breakfast for Sunday through Friday is about 140 CHF inclusive per night

About a mile from the venue:
Motel One Zürich
Stockerstrasse 61
8002 Zürich, Switzerland
41 44 226 77 00
For early February 2019, a room with breakfast for Sunday through Friday is about 180 CHF per night (unclear if inclusive).

This hotel is at the airport  and has a tram (#10) which leaves every 8 minutes and takes about half an hour to the Central Train Station:
Novotel Zürich Airport Messe
Lindbergh-Platz 1
8152 Opfikon, Switzerland
+41 44 829 90 00
For early February 2019, a room with breakfast for Sunday through Friday is about 127 CHF inclusive per night


Conference Schedule 


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Please Note:  The schedule and content may be altered during the course of the event as circumstances dictate or new issues arise to be covered.

Session Types:  A = Admin; G = General; T = Technical; W = Working (Testing, Joint Work, Workshop, Lab)

Tuesday 5 February 2019
0830-0900 Coffee and Tea
 0900-0930 A  Conference Opening
Welcome, logistics, introductions, review of schedule for week
0930-1000 A  Reports on CalConnect Activities
TC activities, liaison activities, report from the Board
1000-1030 A  New and Non-Member Presentations
Short introductions to new/non members attending
1030-1100 Break and Refreshments
1100-1130 A  Host Session
1130-1230 W  Testing; Joint Work; meetups
1130-1230 A  Introduction to CalConnect Q&A (if needed)
An optional session for first-time attendees. The genesis of CalConnect, a brief history, how CalConnect works, followed by questions.
1230-1330 Lunch
1330-1400 W  Workshop preparation
Arrival, greetings, seating, etc.
1400-1530 W  Public Time Zone Workshop
1530-1600 Break and refreshments
1600-1730 W  Time Zone Workshop (continued)
1730-1930 Welcome Reception
Wednesday 6 February 2019
0830-0900 Coffee and Tea
0900-1000 G  Follow-on to Time Zone Workshop
Issues identified, next steps for TC-DATETIME, To Dos for CalConnect
1000-1030 G  Introduction and discussion on microformats
Should we address microformats such as hCalendar? Formal profile for iCalendar/JSCalendar?
1030-1100 Break and Refreshments
1100-1115 T  iCalendar Boolean Parameters
Yes/No, True/False, Both? To Dos: test, audit specs, Best Practices document
1115-1145 G  Client Representation of multi-timezone data
Problems with displaying multiple timezones for data
1145-1230 G  CalSPAM and Abuse Audit Draft
Feedback from publishing the document and how to move on
1230-1330 Lunch
1330-1430 T  JSContacts - JSON Representation for Contacts
Current representation of contacts in JSContact; discussion on changes and additions
1430-1530 G  Internationalization / Localization
Status on I18N in iCalender and JSCalendar; multilingual support; next steps
1530-1600 Break and refreshments
1600-1730 G  Public Calendars Discovery/Subscription/Sharing
Presentation and discussion of additions to CalDAV to support discovery of and subscription to public calendars
Thursday 7 February 2019
0830-0900 Coffee and Tea
0900-0930 G  Developers Guide
Current status; new hosting option; suggestions for content; request for content
0930-1030 T  "Party Crashing" specification
Uninvited attendees, how to deal with and manage, moving forward
1030-1100 Break and Refreshments
1100-1130 A  CalConnect Standards Activities and Liaisons
Update on CalConnect standards activities and liaisons with external SDOs
1130-1230 G  ISO Date and Time Standards Update
ISO 8601-1 and -2, vocabulary, time zones (ISO 34001, 002, 003)
1230-1330 Lunch
1330-1430 T  VCARD, TC211, ISO 19160 Update
Status of ongoing work, structured name Interchange, digital addressing registry
1430-1530 G  CalConnect/ISO Joint Work
Metanorma document meta-model ISO 36001
1530-1600 Break and refreshments
1600-1700 G  Moving forward with Metanorma and Asciidoc/Asciidoctor
No standardized format, difficult to use; should CalConnect standardize? Optional: Authoring CalConnect Standards
1700-1730 G  Privacy by Design and ISO PC 317
Report on ISO/PC 317 meeting; CalConnect input to process
1915-2130 Conference Dinner
Zeughauskeller Zürich, Bahnhofstrasse 28 A 
Friday 8 February 2019
0830-0900 Coffee and Tea
0900-1000 T  Delayed/stalled drafts at IETF
Moving forward with resurrecting or discarding, updating and publishing
1000-1030 T  VPOLL moving forward
Reorganize draft, second poll mode, iTIP, JSON/JSCalendar extension
1030-1100 Break and Refreshments
1100-1130 G  Revisit vEvent URL schema extension
Reactivate?  Updates needed? Next steps? Move to publish?
1130-1200 G  BOF:  TBD
1200-1210 A  Technical Committee Directions for period to CalConnect XLV
1210-1230 T  CalConnect Plenary Meeting
Administrative business, coming events, consensus agreements on decisions reached during the week, open floor.
1230-1330 Lunch
1330-1530 W  Working Sessions and Testing
CalDAV Tester, DevGuide, Joint Testing
1530-1600 Break and refreshments
1600-1730 W  Working Sessions and Testing
1730 Close of CalConnect XLIV



Please see the Reading List for the Conference at