Convinience for Datetime handling in combination with Zope

bda.calendar.base contains functions adressing programmers all-day tasks not (or only partly) covered by pythons datetime or zopes DateTime.

Major part of these function is timezone aware. Also ist easy to deal with timezones. An TimezoneFactory can be provided in the specific application to i.e. be aware of the users timezone (i.e. in case of webapps).

calculators

CWof(date)

the calendar week number of a date.

firstDayOfCW(year, cw, tzinfo=None)

first day of a numbered calendar week

daysOfWeek(year, cw, tzinfo=None)

yields 7 datetimes of the given calendar week

numberOfDaysInYear(dt)

calculate number of day of the year of the given datetime year

numberOfDaysInMonth(dt)

calculates number of days of the given datetimes month

daysOfMonth

yields all days as datetimes of the given month

hoursOfDay(year, month, day, tzinfo=None)

yields all hours of a day as datetimes

isSameDay(first, second)

detects if two dates are the same day. bool.

converter

dt2DT(dt)

Convert Python's datetime to Zope's DateTime. Acts timezone-aware.

DT2dt(DT)

Convert Zope's DateTime to Pythons's datetime. Acts timezone-neutral, outcome is on UTC.

dt2UTCString(dt)

build a '-' separated string from the datetime timetuple as UTC.

dtFromUTCString(utcstr)

build datetime from timetuple UTC string.

dt2epochday(dt)

Number of days since epoch. timezone gets a problem here, we need to normalize all to GMT to make it recognize the same day even if it a different timezone: i.e. 2008-05-01T00:00:00+02:00 (CEST)

inspector

All functions are using the timezoneAdjuster (see below). therefore a context is passed

dtYear(dt, context=None):

year of datetime.

dtMonth(dt, context=None)

month of datetime.

dtDay(dt, context=None)

day of datetime.

dtHour(dt, context=None)

hour of datetime.

dtMinute(dt, context=None)

minute of datetime.

dtWeekday(dt, context=None)

Weekday of datetime.

pyDt

Detect wether dt is instance of datetime object.

recurring

Simple recurring features. for more sophisticated recurring feature refer to dateutils.rrule

recueDays(start, until, recuemode, offset)

Generates list of recue days.

timezone

Dealing with timezones is always pain. With these common features it get less pain. Using ZCA where registering a common TimezoneFactory using the computers system timezone. It is used by the timezoneAdjuster. If you register a more specific TimezoneFactory following its simple interface - its just a callable - , you can implement user configurated multi-timezone aware applications. This is all based on pytz, because pytz just works.

ServerTimezoneFactory(context)

The timezone of the server (current computer). You never need to use this directly.

timezoneAdjuster(context, dt)

New datetime with given timezone. Given datetime cant be naive!

tzawarenow()

timezone aware now datetime using utc timezone. if you need the current timezone adjust it.

Contributors

• Jens Klein <jens@bluedynamics.com>
• Robert Niederreiter <rnix@squarewave.at>

License

Copyright (c) 2008-2022, BlueDynamics Alliance, Austria All rights reserved.

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 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 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.

Changes

1.2.5 (2022-12-05)

• Try again to release wheel with zest.releaser. [rnix]

1.2.4 (2022-12-05)

• Release wheel. [rnix]

1.2.3

• Remove superfluous import. [rnix, 2020-08-12]

1.2.2

• conditional ZCML for pyramid and zope. [rnix, 2011-11-16]