From tlau at tlau.org  Thu Feb 23 00:29:48 2006
From: tlau at tlau.org (Tessa Lau)
Date: Wed, 22 Feb 2006 15:29:48 -0800
Subject: [icalendar-dev] Handling timezones in dtstart/dtend
Message-ID: <20060222232947.GA29671@ofb.net>


Hi,

I'm really happy to see that someone's writing an iCalendar library
for Python!  I've done my share of writing simple ical parsers and
generators, so I appreciate the effort that's gone into this.

I'm running into a problem with parsing iCalendar data files generated
by Lotus Notes (example attached).  These calenders specify the
datestart and dateend using a custom timezone that's defined earlier
in the .ics file.  However, the parser doesn't seem to handle these
timezones correctly, and gives me a naive datetime object rather than
a timezone-aware datetime.

What I think should happen is that the parser should recognize that
the timezone is specified as a parameter on the dtstart property, and
retrieve that timezone from where it was specified earlier in the
calendar data.

Alternatively, I can look for the presence of this TZID property, and
parse out the timezone info myself, and convert the naive datetime to
an aware datetime.  However, it seems like this should be handled by
the iCalendar library.

What do you think?

Thanks,
--Tessa
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From sidnei at enfoldsystems.com  Thu Feb 23 01:08:13 2006
From: sidnei at enfoldsystems.com (Sidnei da Silva)
Date: Wed, 22 Feb 2006 21:08:13 -0300
Subject: [icalendar-dev] Handling timezones in dtstart/dtend
In-Reply-To: <20060222232947.GA29671@ofb.net>
References: <20060222232947.GA29671@ofb.net>
Message-ID: <20060223000813.GD4398@cotia>

On Wed, Feb 22, 2006 at 03:29:48PM -0800, Tessa Lau wrote:
| 
| Hi,
| 
| I'm really happy to see that someone's writing an iCalendar library
| for Python!  I've done my share of writing simple ical parsers and
| generators, so I appreciate the effort that's gone into this.
| 
| I'm running into a problem with parsing iCalendar data files generated
| by Lotus Notes (example attached).  These calenders specify the
| datestart and dateend using a custom timezone that's defined earlier
| in the .ics file.  However, the parser doesn't seem to handle these
| timezones correctly, and gives me a naive datetime object rather than
| a timezone-aware datetime.
| 
| What I think should happen is that the parser should recognize that
| the timezone is specified as a parameter on the dtstart property, and
| retrieve that timezone from where it was specified earlier in the
| calendar data.
| 
| Alternatively, I can look for the presence of this TZID property, and
| parse out the timezone info myself, and convert the naive datetime to
| an aware datetime.  However, it seems like this should be handled by
| the iCalendar library.
| 
| What do you think?

For the records, the 'DateUtil' python package can create a timezone
object from a ical file. That's what I'm using.

http://labix.org/python-dateutil

-- 
Sidnei da Silva
Enfold Systems, LLC.
http://enfoldsystems.com