Zope 2 date index with support for recurring events.

## Products.DateRecurringIndex

A Zope 2 catalog index with support for indexing of recurring events, following the icalendar standard. It is a drop-in replacement for the Zope2 DateIndex and will produce the same results for non-recurring dates.

The DateRecurringIndex accepts following parameters:

id

Required. The name of the field or object attribute to be indexed.

recurdef

Required. The name of the object attribute, which returns the icalendar rrule (recurrence rule) string.

until

Optional. The name of the objects attribute, which returns the date, until the recurrence should happen. The recurrence definition can also contain an UNTIL component. If both are defined, the recurrence calculation stops whenever the first until-date is met. If not given at all, there is a MAXCOUNT ceiling constant, defined in plone.event.recurrence, which defines the maximum number of occurences.

### Datetime.DateTime vs. datetime.datetime

Inside Zope2 everybody uses DateTime.DateTime or iow the Zope-DateTime. At time of writing Zope-DateTime (around 1998) there was no good date/time implementation in python. But these days we have a better implementation. Even if the pythons datetime implementation has its problems, together with pytz for timezone handling it is very mature.

So, why is it covered here? Just because dst-handling over recurring events works only if the start and until values are non-naive python datetimes. Just keep it in mind when using this index: If you use recurring dates and you want dst-adjust make sure your implementation returns a python datetime. And also keep in mind: If youre i.e. in Austria with CET timezone, add a recurring date: it will look fine to you, every day at 11:00am, doesnt matter if DST or not, your event happens. If you go international and your event is shown in a different timezone - or in the same in a country without DST at all - it might differ and is not always at the the time.

#### Contributions by

Contributors, please add you name here! By doing this, you also state, that you have signed the Plone Contributors Agreement [1][2]. Thanks!

• Jens Klein, yenzenz (Original implementation)

• Johannes Raggam, thet

• Roman Joost, romanofski

• Dorneles Tremea, Dorneles

• Sean Upton, supton

### Changelog

#### 3.0.1 (2019-10-03)

• remove unicode char from CONTRIBUTORS.rst [tkimnguyen]

#### 3.0.0 (2018-10-02)

• Python 3/ Zope 4 compatibility. [pbauer, jensens]

• Code alignment to Products.ZCatalog 4. [thet]

• PEP 8. [thet]

#### 2.1 (2014-03-02)

• Fix the manage template declaration and avoid the deprecation warnings on Zope startup. [thet]

#### 2.0.1 (2013-04-24)

• Licence and contributors updates. [jensens]

#### 2.0 (2012-10-12)

• Use tuple to store self._unindex (reverse index) values, instead of an IISet, allowing for proper sorting, intended to fix: https://github.com/collective/Products.DateRecurringIndex/issues/1 For proper sorting, existing installations may wish to reindex any indexes installed in their catalog using DateRecurringIndex. [seanupton]

#### 2.0b3 (2012-03-02)

• Fixed broken manage template. [romanofski]

• Added template to browse index contents. [romanofski]

• Repackaging: Fixing MANIFEST.in and adding missing files. [thet]

#### 2.0b2 (2012-02-25)

• Repackaging: Adding a MANIFEST.in file. [thet]

#### 2.0b1 (2012-02-24)

• Refactoring to support recurrence calculations based on icalendar recurrence rules via plone.event. [thet]

#### 1.0 (2009-04-10)

• Initial release [jensens]

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of the BlueDynamics Alliance nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY BLUEDYNAMICS ALLIANCE AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEDYNAMICS ALLIANCE AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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