Category Archives: Ical RFC5545 / 2445

Notes on working with the icalendar spec:http://www.ietf.org/rfc/rfc5545.txt
(RFC2445 spec is obsolete)
More readable format here using old spec: http://www.kanzaki.com/docs/ical/

Correct Handling of UID, RECURRENCE-ID, SEQUENCE

Some folks have been using the free version of this plugin for several years.  Some of them have recurring events with modified instances.  Sometimes the frequency of modifications is high.   In the last few months this has caused a fair … Continue reading

Posted in amr events, amr ical events list, Ical RFC5545 / 2445, Notes | Comments Off

Dates, Times, Formatting

There are a number of date and time options for you to choose when displaying your events.    The main ones you should be using are created by the plugin and will be formatted by the date and time settings you … Continue reading

Posted in amr events, amr ical events list, Ical RFC5545 / 2445 | Tagged , | Comments Off

Problem with Dates/Time – Off by 1 Hour?

The dangers in choosing an events plugin without knowing whether it properly supports timezones and daylight saving. The developer may not have needed daylight saving for his country, but if you have daylight saving, or your users are intentional / across time zones, it is very important. Even if a developer has timezone support, will he/she have dealt with recurring events properly (where event recurs in one timezone, but is displayed in another… ) Continue reading

Posted in amr events, amr ical events list, Ical RFC5545 / 2445 | Tagged , , | Comments Off

Need to know the possible combinations for repeating dates? – an Ical cheatsheet

A “cheatsheet” page for the ical rrule for repeating events. Shows the valid combinations of “by” rules, and indicates whether they limit or expand the possible set of repeating dates for a given frequency. Continue reading

Posted in amr events, amr ical events list, Ical RFC5545 / 2445, Notes | Comments Off

What every developer ought to know about timezones wrt calendar files

Notes on the handling of timezones in various applications, the confusions that can result when calendar syncing, sharing, publishing etc, and some notes for developers to prevent errors. Continue reading

Posted in amr ical events list, Ical RFC5545 / 2445 | Comments Off

Do you need BYYEARDAY for your events?

Does your group need to be able to enter events using BYYEARDAY, or is BYMONTH and BYMONTHDAY better? Continue reading

Posted in amr events, Ical RFC5545 / 2445 | Comments Off

The last week of the year is….

Negative By weeknos – so what is actually the “last week” of the year Continue reading

Posted in amr events, Ical RFC5545 / 2445 | Comments Off

What do you think is the “first week” of the year ?

Week numbers and week start days, definitions, complexity and what the plugin does Continue reading

Posted in amr events, How To, Ical RFC5545 / 2445 | Comments Off

Paydays, Last working days and why BYSETPOS is useful

How to represent some complex recurring dates like the last business day, or last weekday in a month or year, using BYSETPOS Continue reading

Posted in amr events, Ical RFC5545 / 2445 | Comments Off

TZID’s with quotes around them

Some ics files (eg: a zimbra file)  I have encountered have the TZID enclosed in quotes. DTSTART;TZID=”America/New_York”:20080908T130000 The usual use (google calendar etc) is: DTSTART;TZID=America/New_York:20080908T130000 The spec examples do not show quotes and the quotes in the terminology definition are … Continue reading

Posted in Ical RFC5545 / 2445, Notes | Comments Off