I have generated an ICS file with an appointment (example 1). This appointment can change often so I would like to send out new ICS files (using my backend). This would normally work by sending the file with the same appointment UID and a higher SEQUENCE (example 2). This works great with iCloud Calendar where the existing item gets moved to the new date but does NOT work with Exchange/Google Calendar.
Any ideas in how to make ICS updates update the existing calendar item in Exchange (without complicated subscriptions/setting up a webcal server)?
Example 1: Initial ICS
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:adamgibbons/ics
METHOD:PUBLISH
X-PUBLISHED-TTL:PT1H
BEGIN:VEVENT
UID:2211#planning.company.nl
SUMMARY:Planning Item 01
DTSTAMP:20191123T170300Z
DTSTART:20191123T123000Z
DTEND:20191123T143000Z
SEQUENCE:1
DESCRIPTION:Planning Item 01
END:VEVENT
END:VCALENDAR
Example 2: Updated ICS
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:adamgibbons/ics
METHOD:PUBLISH
X-PUBLISHED-TTL:PT1H
BEGIN:VEVENT
UID:2211#planning.company.nl
SUMMARY:Planning Item 01
DTSTAMP:20191129T170300Z
DTSTART:20191129T123000Z
DTEND:20191129T143000Z
SEQUENCE:0
DESCRIPTION:Planning Item 01
END:VEVENT
END:VCALENDAR
While the DTSTAMP in example 2 is after the one in example 1, your SEQUENCE is backward (initial = 1, update = 0).
Related
I am using ical4j to send out emails with a calendar attachment. I am able to add an organizer based on this SO post: How should I use iCal4j to add a meeting organizer to an iCal event
event.getProperties().add(new Organizer("mailto:bob#example.com"));
The problem is that no attendees added to the calendar is able to cancel an event. If I create (manually, no ical4j) an calendar appointment in Outlook Online, I am able to cancel an event as shown below:
However, the email with an ical4j attachment I received as the organizer (see the above code example) only gives me three options: Yes, No, Maybe as shown below:
How can I make someone among an meeting's attendees be able to cancel the meeting?
------- Update 11/15 -------
Based on the suggestion from #fortuna, my program generated the following event. I am still unable to cancel an event.
BEGIN:VCALENDAR
PRODID:-//Events Calendar//iCal4j 3.0.1//EN
CALSCALE:GREGORIAN
METHOD:REQUEST
BEGIN:VEVENT
DTSTAMP:20211115T144506Z
DTSTART;TZID=America/New_York:20211215T110000
DTEND;TZID=America/New_York:20211215T114500
SUMMARY:ABC123 School
TZID:America/New_York
LOCATION:Virtual
UID:153ab747-bbd2-4964-9112-9fa0d29ed306
STATUS:CONFIRMED
ORGANIZER;ROLE=CHAIR:mailto:dev1#example.com
ATTENDEE;ROLE=REQ-PARTICIPANT:mailto:dev2#example.com
ATTENDEE;ROLE=REQ-PARTICIPANT:mailto:dev1#gmail.com
END:VEVENT
END:VCALENDAR
I manually generated an event in Outlook Online and forwarded it to my yahoo account to get the calendar attachment:
BEGIN:VCALENDAR
METHOD:REQUEST
PRODID:Microsoft Exchange Server 2010
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Eastern Standard Time
BEGIN:STANDARD
DTSTART:16010101T020000
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010101T020000
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ORGANIZER;CN="dev1":mailto:dev1#example.com
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=dev2
g:mailto:dev2#yahoo.com
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN="dev3"
:mailto:dev3#example.com
DESCRIPTION;LANGUAGE=en-US:\n\n\n________________________________________\n
From: dev1 <dev1#example.com>\nSent: Monday\, November 15\, 2021 8:5
2:23 AM (UTC-05:00) Eastern Time (US & Canada)\nTo: dev3\; dev1\,
\nSubject: test\, please ignore it.\nWhen: Monday\, N
ovember 22\, 2021 10:30 AM-11:00 AM.\nWhere:\n\ntest\n\n__________________
______________________________________________________________\nMicrosoft
Teams meeting\nJoin on your computer or mobile app\nClick here to join the
.....
cdd5fc5d11c&threadId=19_meeting_OGYzZjAdddxMjYtYYy00ZDE4LWE0NjctZjY4OTA0ZG
I0ZTQ4#thread.v2&messageId=0&language=en-US>\n____________________________
____________________________________________________\n
UID:040000008200E00074C5B7101A82E00800000000933C540328DAD701000000000000000
0100000001771BBC5CAD45B499CBF167EE077185B
SUMMARY;LANGUAGE=en-US:FW: another test for GRD\, please ignore it.
DTSTART;TZID=Eastern Standard Time:20211122T103000
DTEND;TZID=Eastern Standard Time:20211122T110000
CLASS:PUBLIC
PRIORITY:5
DTSTAMP:20211115T135223Z
TRANSP:OPAQUE
STATUS:CONFIRMED
SEQUENCE:0
LOCATION;LANGUAGE=en-US:
X-MICROSOFT-CDO-APPT-SEQUENCE:0
X-MICROSOFT-CDO-OWNERAPPTID:2119924365
X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-CDO-ALLDAYEVENT:FALSE
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-CDO-INSTTYPE:0
X-MICROSOFT-ONLINEMEETINGINFORMATION:{"OnlineMeetingChannelId":null\,"Onlin
eMeetingProvider":3}
X-MICROSOFT-ONLINEMEETINGTOLLNUMBER:+1 571-429-6038
X-MICROSOFT-ONLINEMEETINGCONFERENCEID:475654328
X-MICROSOFT-SKYPETEAMSMEETINGURL:https://teams.microsoft.com/l/meetup-join/
19%3ameeting_OGYzZjAxMjYtYzFlYy00ZDE4LWE0NjctZjY4OTA0ZGI0ZTQ4%40thread.v2/
0?context=%7b%22Tid%22%3a989b5e2ddda-14e4-4efe-93b7-8cdd5fc5d11c%22%2c%22O
id%22%3a%2256f6a1be-b722-47fd-b69c-5950f281818f%22%7d
X-MICROSOFT-SCHEDULINGSERVICEUPDATEURL:https://api.scheduler.teams.microsof
t.com/teams/989b5e2a-14e4-4efe-9ddd5fsasdfc5d11c/56f6a1be-b722-47fd-b69c-5
950f281818f/19_meeting_OGYzZjddYtYzFl4Ysa00ZDE4LWE0NjctZjY4OTA0ZGI0ZTQ4#th
read.v2/0
X-MICROSOFT-SKYPETEAMSPROPERTIES:{"cid":"19:meeting_OGYzZjAxMjYtYzFlYy00ZDE
4LWE0NjctZjY4OTA0ZGI0ZTQ4#thread.v2"\,"rid":0\,"mid":0\,"uid":null\,"priva
te":true\,"type":0}
X-MICROSOFT-ONLINEMEETINGCONFLINK:conf:sip:dev1#example.com\;gruu\;opaque=app:
conf:focus:id:teams:2:0!19:meeting_OGYzZxAxMjYtdasYzFlYy00Z4LWE0NjctZjY4OTA
0ZGI0ZTQ4-thread.v2!56f6a1beb72247fdb69c5818dasdfsadf!989b5e2a14e44efe93b78
cdd5fc5d11c
X-MICROSOFT-DONOTFORWARDMEETING:FALSE
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MICROSOFT-LOCATIONS:[]
BEGIN:VALARM
DESCRIPTION:REMINDER
TRIGGER;RELATED=START:-PT15M
ACTION:DISPLAY
END:VALARM
END:VEVENT
END:VCALENDAR
I suspect you may need to add something like a participation role to your organizer property:
https://datatracker.ietf.org/doc/html/rfc5545#section-3.2.16
e.g. ORGANIZER;ROLE=CHAIR:bob#example.com
Another way to find out how Outlook does it is to forward the event "as icalendar" to another email address and inspect the ".ics" attachment.
I have created an ICS file that I include in my emails through my web app, the times specified are in UTC time, this needs to be applied as in my testing it appears the Calendar client will assume the timezone is the users local time.
Here is what my ICS file looks like:
BEGIN:VCALENDAR
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:VEVENT
UID:a0F8E00000oWo53UAC
DTSTART:20200814T194500
DTEND:20200814T204500
SUMMARY:Your Appointment - Appointment Name Here
LOCATION:123 Fake Street, New York, New York, 1234
DESCRIPTION:
ORGANIZER;CN=:MAILTO:
BEGIN:VALARM
TRIGGER:-PT1H
ACTION:DISPLAY
END:VALARM
END:VEVENT
END:VTIMEZONE
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:VEVENT
UID:a0F8E00000oWo59UAC
DTSTART:20200814T220000
DTEND:20200814T230000
SUMMARY:Your Appointment - Appointment Name Here
LOCATION:123 Fake Street, New York, New York, 1234
DESCRIPTION:
ORGANIZER;CN=:MAILTO:
BEGIN:VALARM
TRIGGER:-PT1H
ACTION:DISPLAY
END:VALARM
END:VEVENT
END:VTIMEZONE
END:VCALENDAR
I have added VTIMEZONE tags around my EVENT node. I have also specified the timezone at the top like TZID:UTC.
This doesn't appear to work. Can someone help me correct this?
The VEVENT component must not be inside of the VTIMEZONE component!
Specify a timestamp's timezone like so:
DTSTART;TZID=UTC:20200814T194500
I tried to put two events together in one ICS. To do this I helped an example put on this forum:
(...)
BEGIN:VCALENDAR
PRODID:-//bobbin v0.1//NONSGML iCal Writer//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART:20100701T080000Z
DTEND:20100701T110000Z
DTSTAMP:20091130T213238Z
UID:1285935469767a7c7c1a9b3f0df8003a#yoursever.com
CREATED:20091130T213238Z
DESCRIPTION:Example event 1
LAST-MODIFIED:20091130T213238Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Example event 1
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
DTSTART:20100701T120000Z
DTEND:20100701T130000Z
DTSTAMP:20091130T213238Z
UID:1285935469767a7c7c1a9b3f0df8003b#yoursever.com
CREATED:20091130T213238Z
DESCRIPTION:Example event 2
LAST-MODIFIED:20091130T213238Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Example event 2
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR
(...)
The result was that the invitation noticed inside the calendar only first event, the second was omitted.
What was wrong?
I observed the same result in Outlook and Gmail.
if you want to import many events :
To gmail , you could implement the api of gmail calendar ,
To outlook , you can alter the icalendar method to "publish" , and it would create new calendar , the new calendar will include many events
if you send just an appointment , that would not be a problem , but if you have many appointments, it would be a problem , because its weird if you include many events in an email or you send per appointment per mail
I have a web app that contains many specific events for users in a MySQL database. I want to generate one .ics file that users can download that contains all of these events.
I'm not able to get Microsoft Outlook 2003 to acknowledge anything past the first event in my ICS file. Are there any known workarounds for this issue? Or am I doing anything wrong?
Here's my ICS file contents:
BEGIN:VCALENDAR
VERSION:1.0
BEGIN:VEVENT
DTSTART:20120222T120000
DTEND:20120222T123000
SUMMARY:Event Name 1
LOCATION:
DESCRIPTION:This is the description of event 1.
PRIORITY:3
END:VEVENT
END:VCALENDAR
BEGIN:VCALENDAR
VERSION:1.0
BEGIN:VEVENT
DTSTART:20120223T120000
DTEND:20120223T123000
SUMMARY:Event Name 2
LOCATION:
DESCRIPTION:This is the description of event 2.
PRIORITY:3
END:VEVENT
END:VCALENDAR
BEGIN:VCALENDAR
VERSION:1.0
BEGIN:VEVENT
DTSTART:20120224T120000
DTEND:20120224T123000
SUMMARY:Event Name 3
LOCATION:
DESCRIPTION:This is the description of event 3.
PRIORITY:3
END:VEVENT
END:VCALENDAR
Thanks.
You can try with only one calendar with multiple events:
BEGIN:VCALENDAR
VERSION:1.0
BEGIN:VEVENT
DTSTART:20120222T120000
DTEND:20120222T123000
SUMMARY:Event Name 1
LOCATION:
DESCRIPTION:This is the description of event 1.
PRIORITY:3
END:VEVENT
BEGIN:VEVENT
DTSTART:20120223T120000
DTEND:20120223T123000
SUMMARY:Event Name 2
LOCATION:
DESCRIPTION:This is the description of event 2.
PRIORITY:3
END:VEVENT
END:VCALENDAR
I am trying to create an .ics file that can be used to import all-day events.
I'm using the following code in the .ics file:
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:uid1#example.com
DTSTAMP:19970714T170000Z
ORGANIZER;CN=John Doe:MAILTO:john.doe#example.com
DTSTART;TSID="GMT":20110719T040000
DTEND;TSID="GMT":20110719T200000
TRANSP:OPAQUE
SUMMARY:Holiday
X-LOTUS-UPDATE-SEQ:1
X-LOTUS-NOTESVERSION:2
X-LOTUS-APPTTYPE:2
END:VEVENT
END:VCALENDAR
I exported a test all-day event, so I could check the formatting, but it still does not display in the top panel as an all-day event.
Does anyone know how to get an event to appear as an all-day event in Lotus Notes?
The correct solution was to remove the time from the DTSTART and DTEND e.g.
DTSTART;TSID="GMT":20110719T040000 ==> DTSTART;TSID="GMT":20110719
Hope this helps some people.
This is a working example:
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//innerjoin.org/NONSGML Innerjoin iCal Test Case Gen 20050301//EN
BEGIN:VEVENT
UID:20050301-96412-innerjoin-org
DTSTART;VALUE=DATE:20050301
DTEND;VALUE=DATE:20050302
DTSTAMP:20050301
URL:
http://www.innerjoin.org/iCalendar/test-cases/20050301-20050302.txt
SUMMARY:
Event from 20050301 to 20050302
DESCRIPTION:
Event starting at 20050301 and lasting until 20050302\n
- Option: Starting on 20050301\n
- Option: Ending on 20050302\n
- Default: No timezone specified\, using local time\n
- Default: No status given\, not necessarily confirmed\n
- Default: No class given\, treat event details as publicly accessible\n
- Default: Event treated as opaque
END:VEVENT
END:VCALENDAR