Internet Calendaring and Scheduling (iCalendar) for Python

The icalendar package is a parser/generator of iCalendar files for use with Python.

Mailing list:
Dependencies:setuptools and since version 3.0 we depend on pytz.
Compatible with:
 Python 2.6, 2.7 and 3.3+


  • 4.0: API refactoring

Changes in version 3.0

API Change

Since version 3.0 the icalendar de/serialization API is unified to use only to_ical (for writing an ical string from the internal representation) and from_ical (for parsing an ical string into the internal representation).

to_ical is now used instead of the methods ical, string, as_string and instead of string casting via __str__ and str.

from_ical is now used instead of from_string.

This change is a requirement for future Python 3 compatibility. Please update your code to reflect to the new API.

Timezone support

Timezones are now fully supported in icalendar for serialization and deserialization. We use the pytz library for timezone components of datetime instances. The timezone identifiers must be valid pytz respectively Olson database timezone identifiers. This can be a problem for ‘GMT’ identifiers, which are not defined in the Olson database.

Instead of our own UTC tzinfo implementation we use pytz UTC tzinfo object now.

About this fork which is not a fork anymore

The aim of this fork (not fork anymore, read further) was to bring this package up to date with latest icalendar RFC specification as part of project which goal is to bring recurrent events to Plone.

After some thoughts we (Plone developers involved with send a suggestion to to take over maintaining of icalendar. Nobody objected and since version 2.2 we are back to development.

Test Coverage Report

Output from coverage test:

Name                           Stmts   Miss  Cover
src/icalendar/__init__             4      0   100%
src/icalendar/cal                312      7    98%
src/icalendar/caselessdict        65      7    89%
src/icalendar/compat               1      0   100%
src/icalendar/parser             193      5    97%
src/icalendar/parser_tools        20      0   100%
src/icalendar/prop               540     62    89%
src/icalendar/timezone_cache       1      0   100%
src/icalendar/tools               16      0   100%
TOTAL                           1152     81    93%