Python solution to parse Google calendar's recurrencies

Question

I'm trying to parse GCal's recurrence field. Usually, it looks like this:

DTSTART;TZID=Europe/Kiev:20101111T140000
DTEND;TZID=Europe/Kiev:20101111T150000
RRULE:FREQ=DAILY;UNTIL=20101112T120000Z
BEGIN:VTIMEZONE
TZID:Europe/Kiev
X-LIC-LOCATION:Europe/Kiev
BEGIN:DAYLIGHT
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:EEST
DTSTART:19700329T030000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:EET
DTSTART:19701025T040000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE

I need to extract valuable for me part: event's DTSTART, DTEND, RRULE, and other iCaledar's field. Is there an existent solution for doing this?

What's your question? Do you want to parse the entire record, understand the format of RRULE lines, something else? — The Archetypal Paul, Nov 10 '10 at 14:34
I want to parse entire record and extract event's DTSTART, DTEND, RRULE and RDATE. — cleg, Nov 10 '10 at 14:42

score 3 · Answer 1 · answered Nov 10 '10 at 15:32

3

You can try the fantastic library python-dateutil (http://labix.org/python-dateutil).

answered Nov 10 '10 at 15:32

Antonio Beamud

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I've tried this lib, but it's only iCaledar-compatible and does not understand DTEND field and other extras. – cleg Nov 10 '10 at 16:06
for DTEND you can use until, as rrule pararameter. ¿What other extras do you need? – Antonio Beamud Nov 11 '10 at 12:47
2

@cleg: don't mistake iCalendar-the-standard (RFC 2445, now RFC 5545) with iCalendar-the-program. The calendar you show above is in iCalendar-the-format. – Ulrich Schwarz Nov 14 '10 at 16:11
This is where I wound up too. I did some simple parsing of the ical dtstart using strptime and then passed it to dateutil.rrule.rrulestr. – Julian Jun 10 '14 at 16:58

score 1 · Answer 2 · answered Nov 14 '10 at 13:52

1

I'm using mxm's icalendar package:

http://codespeak.net/icalendar/

and I'm pretty sure it passes all ical fields to parsed objects. I'm not sure about reoccurence because I just don't use that in my app, but I would be surprised to find out it's not there.

answered Nov 14 '10 at 13:52

GDR

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Looking at that link you might think the library hasn't been updated in 4 years. More current versions can be found here: http://pypi.python.org/pypi/icalendar – mbarkhau Dec 13 '10 at 14:14

score 0 · Answer 3 · answered Jan 28 '12 at 08:03

As I have a similar problem and could not find anything doing the job, I've just released on pypi a small project which will not only give you the DTSTART, DTEND, RRULE, RDATE, UID and SUMMARY values but will also given a specific time window return all the dates that fullfill the RRULE rules.

You can get it here: http://pypi.python.org/pypi/pyICSParser (please note I'm not at all a SW engineer so good coding practices compliance is poor and though I'll work on documentation it is still very early stage)

Python solution to parse Google calendar's recurrencies

3 Answers3

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