NB: This is a patched version of phpicalendar 2.4 made by Faster IT GmbH.

The site phpicalendar.net seems to be down for ages.
The original software can be obtained still at https://sourceforge.net/projects/phpicalendar/ .
This version is hosted at https://git.faster-it.de/phpicalendar/ .

THIS SOFTWARE HAS SERIOUS SECURITY ISSUES. ONLY RUN THIS IN YOUR INTRANET.
OR WHEREEVER YOU TRUST EVERY USER. REALLY, WE ARE NOT JOKING.

Read the above sentence again. Thanks. And no, we don't offer support on this.

=== snip === Original README follows === snip ===

                 ______________________________________
                |            PHP iCalendar             |
                | http://www.phpicalendar.net/         |
                |______________________________________|

Introduction:
-------------
PHP iCalendar is a PHP-based iCal file viewer/parser to display iCals in a Web browser.
Its based on v2.0 of the IETF spec. It displays iCal files in a nice logical,
clean manner with day, week, month, and year navigation. It is available in 13
languages and includes support for printing, searching and RSS news feeds.
If you need a Calendar application (for creating calendar files), please check
the 'Supported Calendar Applications' section of the README.

Contact:
--------
E-mail the developers and others on the list at:
phpicalendar-devel@lists.sourceforge.net

Installation:
-------------
- Put PHP iCalendar into your Sites folder (or another web directory)
- PHP iCalendar works 'out of the box' but you may want to configure some things
- see section below called "Configuration".
- Put your iCal files into the directory you specify in config.inc.php
  (default is "calendars")
- Make sure PHP is enabled (http://developer.apple.com/internet/macosx/php.html)
- Turn on Web sharing (if not already on)
- View calendars in your web browser
  If it is in your Sites folder, the URL would be:
  <http://localhost/~username/phpicalendar>

Configuration:
--------------
Starting with version 2.24, PHPicalendar uses a default settings file, which
you can overrule with your own configuration settings.

View config.inc-dist.php. The comments behind each variable definition will
tell you what each setting does. Change the values between the quotation
marks to change the setting of that variable. If there are restrictions
as to what that variable can be set to, the comment behind will specify
them.

IN ORDER TO USE THESE SETTINGS YOU MUST RENAME THE FILE to config.inc.php

If you have difficulty with your configuration, you can ask the
developers and other PHP iCalendar users at the PHP iCalendar forums:
http://phpicalendar.net/forums/

Creating calendars and events:
--------------------------------
PHP iCalendar DOES NOT create or edit calendars (or events). Instead it
provides a way to view calendars from applications that generate valid
IETF 2445 files (.ics). Some of the supported applications are:

	- Apple iCal
		- http://www.apple.com/ical/
	- Mozilla Calendar
		- http://www.mozilla.org/projects/calendar/
	- Ximian Evolution
		- http://www.novell.com/products/evolution/
	- KOrganizer
		- http://korganizer.kde.org/
	- WinDates 5.0
		- http://www.rockinsoftware.com/windates.htm

Bugs:
-----
If you find a bug, please let us know. The easiest way for you to do this
is to visit our Bug Tracker on SourceForge. This guarantees that we both
look at it and take time to figure out what is causing it. You can submit
bugs at the following URL:
http://phpicalendar.sourceforge.net/bugs

Requests:
---------
Got an idea? Great! Just like with Bugs, there is a Features Tracker over
on SourceForge. Please use that to sumbit feature requests. That way, you can
see what others have suggested so you don't duplicate requests, and it will give
us a chance to keep the features that haven't been implemented in one central
place that we can find later. The tracker can be found at the following URL:
http://phpicalendar.sourceforge.net/requests

Licensing:
----------
This product is distributed under the GPL.  Please read through the file
COPYING for more information about our license.

Changes:
--------
2.4
	Security fixes:
		More ICS input sanitizing; prevent HTML/XSS injection
	Bug fixes:
		Webcal caching now works like local caching with save_parsed_cals
		Performance improvements with remote calendars; reducing the number
			of file reads/HTTP requests made for each calendar
		Print view missing some events
		Setting time format in preferences page
		Default calendar selections in listbox picker
		Timezone DST calculation with all-day events
		Handling dates before 1970
		Log in cookie handling; thanks gueba!
		Log out URL containing multiple ampersands
		Parsed calendars used the wrong file name for "all calendars"
		Recurring events across multiple versions of PHP; thanks to Len and gueba!
		Better handling of URLs and email addresses in event descriptions
		Navigation forms breaking PHP transparent SID
		Fix strange characters displayed in Locations with % characters
		Fix Bug 2968512 - wrong display in week view, events shifted
	New features:
		Event information displayed with Nice Titles
			Fixes line breaks and some HTML in event tooltips
		Attendee/organizer parsing and email address hyperlinking
		Better display of tabs/line breaks in calendar events
		Strip "blocked" protocols, added by some mail servers
	Translations:
		Updates to Czech translation
		Updates to French translation
		Remove UTF-8 BOM from German language files
		Remove UTF-8 BOM from Korean language files
	Theme changes:
		Change month view navigation to a sidebar
		All pages inherit the width specified in the CSS "maintable" class
		Different row borders in day/week views for :00, :15, :30 and :45
		All-day events in week view has tighter spacing
		Navigation arrows in all pages

2.31
	Fix events ending at midnight bug in day view
	Fix publish.php for 2.3 config system
	add option to hide location in month view
	add option to make individual events downloadable from event view
	Fix calendar showing modified events twice
	Make multiline descriptions display with line breaks in event popup
	Fix German language file
2.3
	Major changes to recurrence handling
	Added more languages
	Added login to month view
	Consolidated common rss functions

2.24
	Fix bug 1681711 - change how todo popups are handled
	Fix bug 1632649 - year display
	Fix location display in months
	Partially fix language files for Polish, Esperanto, Traditional Chinese
	Sanitizer bug fixes
	Fix status bug for publish.php
2.23
	New language files
	Add input sanitizer - important for blocking XSS attacks
	Change template.php to reduce memory usage
	Change template.php to display locations in month view
	Change template.php display in print and month views of events that span multiple days to not repeat listing
	Fix (I hope) utf-8 rendering problems in event.php
	Allow admins to set whether link from rss feed goes to day.php or event.php
	Patch to allow parsing of MS-Outlook generated ics files where line continuation uses tab instead of space.
2.23rc1
	Change parsing of timezones to accommodate extra text from Mozilla and other calendars
	Move getdate to init.inc.php.
	Change date calcs so that rss feeds can list events across more than one year.
	Bug fixes
		Fixed error in german language file
		Change naming of saved parsed cals to allow same calname with different cpath
		Changes to calculation of next datetimes to work with php5.1 variants
		Fix index.php to allow year as default view
		display version on admin index page
		fix overlapping events bug
		fix path problems in template.php

2.22
	template.php will look in templates/default if a file is missing from templates/$template
	add support for WKST and BYPOS tags
	change popup to not require reparsing cal files
	differentiate cookie names for different installs on the same host
	allow image tags in events
	use real calendar names instead of filenames
	Year printview
	Added sidebar to year view
	Modified rss/index.php
	-bug fixes from 2.21
		Suppress lots of warnings and notices
		all combined selection of webcals
		passing of webcals in calendar links
		More items controlled by language files
		Problem with webcals with encoded spaces in URL
		Fixes related to various recurring event combinations
		Fix security hole for getting template file from cookies
2.21
	-patched security hole
	-bug fixes from 2.2
		Modified rss.php to improve compatibility

	-Modified templates to validate as XHTML 1.0 Transitional
2.2
	-Added Apple iCal native repository support.
	-Added support for finding calendars in subdirectories.
	-Can now select multiple local and web calendars.
	-rss.php
		new feed types for different kinds of date ranges
		changed handling of multi-day events
	-bug fixes from 2.1
	 	handling of webcals
		popup encoding
		display when individual calendars displayed

2.1
	-Updated languages: Finnish
	-RSS feeds display as previously indended.
	-Updated languages: Finnish, Norwegian, French
	-Todo popup respects CHARSET
	-Allows multiple calendar selection.
	-Search box can be made to go away.
	-Cookie vulnerbility fixed (credit: aScii)
	-Fix for occasionally broken popups.
	-Various bug fixes.

2.0.1
	-Event URLs display without LOCATION.
	-Fixed VTIMEZONE dates on Windows IIS.
	-Event popup respect CHARSET
	-Tabs parsed into &nbsp;
	-Search links work again.
	-Search cleaned up.
	-Weekly repeating events display better.
	-Slashes stripped from event popups.

2.0 c
	-Enhanced error messaging system.
	-New Open Source Documentation.
		http://phpicalendar.net/documentation
	-All links now have titles for mouseovers.
	-Added Afrikaans Language.
	-Todos can be turned off again.
	-Month bottom can be turned off again.
	-Preferences page can be turned off.
	-Todos won't show private todos.
	-RSS page respects https servers.

2.0 beta
	-Updated translations:
		-Japanese
		-Swedish
		-French
		-Dutch
		-Traditional Chinese
		-Lithuanian
		-Portugese
	-Added iCal specific publish.php.
	-Fixed stat bug.
	-PHP5 support added.
	-Admin page works again.
	-Admin page moved to its own folder.
	-Oct. to Nov. transition more reliable.
	-RSS handles files with spaces.
	-Faster template generation.
	-Requires PHP 4.1.0 or greater now.
	-Various Bug fixes.

2.0 alpha 2
	-Mozilla calendars work again.
	-Todos work again.
	-Enhanced error messaging system.
	-Webcals can be cached for greater performance.
	-Support for 7 colors and 14 calendars by default.
	-Italian and Spanish translations added.
	-Some authentication issues resolved.
	-Change your charset in config.
	-Better Evolution compatibility.
	-Better RSS Feeds.
	-Various Bug fixes.

2.0 alpha
	-New templating system.
	-Workaround for events starting between 0000 and 0100.
	-Removed all styles except for default.
	-Moved all HTML to XHTML.
	-Revamped CSS.
	-Added legends and calendar colors.
	-HTTP authentication added for admin.php.
	-Sessions added for locked calendars.
	-Mozilla calendar support added to publish.php.
	-RSS supports ports other than 80.
	-RSS respects $calendar_path.
	-YEARLY repeating events display better.
	-All Calendars Combined can now be cached for greater performance.
	-Parsing engine now twice as fast.
	-Various bug fixes.

1.1
	-Fixed a bug with HTTP authentication.
	-Fixed a bug with multiple timezones in the same calendar.
	-Added workarounds for dates prior to 1970.
	-Fix for moving event information.
	-Fix for adding newlines in Location field.

1.0
	-Added return false to popups.
	-Added workaround for improperly set DTSTART dates.

1.0 RC-2
	-Fixed all reported bugs.
	-Added failed login dialog for config authentication.
	-RSS and Admin pages do not fail parsing.

1.0 RC-1
	-Fixed all reported bugs.
	-Event and Todo popup now displays calendar name.
	-Event popup now supports more than 1024 characters.
	-Subscribe and download links now work again.
	-URL support added for popups.
	-Added config based calendar authentication.

0.9.5
	-Fixed all reported bugs.
	-Added a method to publish without Webdav in iCal. calendars/publish.php
	-Added ability to set 'bleed time' for events that run past midnight.

0.9.4
	-Vastly improved BYDAY, BYMONTHDAY, BYYEARDAY support.
	-Improved DURATION Support.
	-Smaller HTML footprint on all pages with same look and feel.
	-Combined Calendars automatically refresh when changes are made.
	-Vtodo popup works again.
	-Validation increased on multiple pages.
	-Fixed a bug not listing blacklisted calendars.
	-Moved HTML head into header.inc.php to better support embedding of calendar.
	-Moved HTML foot into footer.inc.php to better support embedding of calendar.
	-Specify the name of 'All Calendars Combined' in language files.

0.9.3
	-Multiple calendar support (up to 8).
	-Fixed pesky <br /> tags in event popup.
	-Added Esperanto language.
	-Major bug fixes.
	-Last to support Netscape 4.x

0.9.2
	-Fixed an extra .php on the preferences page.
	-Increased validations on many pages.
	-Added support for CLASS (public, private, and confidential).
	-Added support for LOCATION
	-Added support for ATTENDEE
	-Added support for ORGANIZER
	-Added support for STATUS
	-New javascript functions provide additional information.
	-Added the ability to correct the servers time display
	-Added admin.php for administration of calendars (uses cookies). See config.inc.php for configuration.
		-Add or Update a calendar via a web interface
		-Delete a calendar via a web interface

0.9.1
	-Added unset preferences
	-Cookies now fall back to defaults if data is bad.
	-Fixed a bug with the latest version of Ximian.
	-Added the ability to hard-set cookie-uri and download-uri.
	-Added Catalan and Tranditional Chinese languages.
	-Back button on preferences page now works.
	-Allow_Preferences option now works.

0.9
	-Added complete VTODO support.
	-Added STATUS support for VEVENT and VTODO.
	-Added RSS auto-detection on day, week, month, and year pages.
	-Added year view icon.
	-Added Finnish and Czech language support.
	-Added Preferences page (uses cookies).
		-Select defualt language
		-Select default calendar
		-Select default view
		-Select default theme
		-Select default start day
		-Select default start time
	-Print view can now be set for your default view.
	-Updated silver and red styles.
	-Calendars can now be stored outside of phpicalendar's installation.
	-Cleaned up folders for easier installation.
	-Minor interface enhancements.
	-Minor bug fixes

0.8.1
	-Added header.inc.php for custom headers.
	-Added Brazilian language support.
	-Fixed a bug with some of the style sheets not displaying correctly.
	-Fixed a bug with RSS not properly validating.
	-Fixed a bug with Search returning errors on some characters.
	-Brought some languages up to 0.8 translations.
	-Added support for "last X in month"
	-Fixed many small bugs.

0.8
	-Added search capability.
	-Added a Printer Friendly view for Day, Week, and Month.
	-Added support for single event changes in a recurring set.
	-Added RSS feeds for Day, Week, and Month.
	-Added Portugese language support.
	-Added 'clickable links' for web addresses.
	-Tweeked Red and Grey styles.
	-Fixed a bug causing Sunday to be listed twice.
	-Fixed a bug preventing < 4.1.0 php users to run app.
	-Fixed a bug displaying quotes in summary.
	-Fixed many other bugs (none open on SF!!)

0.7
	-Added Year view.
	-New themes, Green, Orange, Grey, and Tan.
	-Parses calendars much faster.
	-Page titles added for bookmarking.
	-Fixed bug not letting notes to fully display.
	-Fixed bug in recurring all-day events.
	-Fixed a bug for showing &'s and #'s in the javascript.
	-Greatly improved Mozilla Calendar support.
	-Overlapping events now display better.
	-Added complete timezone support (See TIMEZONE file for details).
	-A new website for PHP iCalendar.
	-Many bug fixes.

0.6
	-Added this README!
    -Greatly improved CSS for "themes", theme SDK available.
    -HTML bug fixes specific to Windows browsers
    -All-day and Regular recurring event both support all types
    -Bottom of month view updated
    -Day, Week, Month navigation brought back.
    -Localization update
    	-Localized dates and times work with Mac OS X as well as
    	 other *nixes.
    	-Almost all text has been translated for supported languages
    	-Added Spanish and Swedish
    -Added ability to turn off the pop-up menu calendar list
    -Added "black-listing" of specific local calendars
    -Added remote calendar support
        -Subscribe to calendars hosted remotely and have them show
         up in your popup
        -Allow any URL of a calendar to be parsed by your server
    -Added custom error page for user-friendly error messages.
    -Added saving of parsed files to separate files for faster processing
    -Custom options for mini-calendars, this months, events
    -Bug fixes

0.5
    -Improved recurring event support
        -All-day and Regular recurring events now obey ending dates and counts
        -Regular recurring events for monthly
    -New UI
        -Mini-calendars in all views
        -Jump-to pop-ups for Weeks and Months
        -Subscribe works properly
        -Color coding on month view
        -Week view colors the length of the time like day
    -Support for event notes/descriptions
    -More language support
        -Danish
        -Dutch
        -Italian
        -Japanese
        -Norwegian
    -Bug fixes

0.4
    -Improved recurring event support
        -All-day recurring for all types
        -Regular recurring events for daily, weekly
    -Event pop-ups
    -More style sheets
    -Multiple language support
        -English
        -French
        -German
        -Polish
    -24-hour clock support
    -Bug fixes

0.3
    -Calendar list popup
    -All-day yearly recurring support
    -Bug fixes

0.2
    -All-day event support
    -Added month and week views
    -Bug fixes

0.1
    -Initial Release