On WordPress? WebCalendar is also available as a WordPress plugin — a scalable, RFC 5545-compliant calendar you can drop into any WordPress site.

About WebCalendar

WebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors. MySQL/MariaDB, SQLite3, PostgreSQL, Oracle, DB2, Interbase, MS SQL Server, or ODBC is required. The version 1.9.X releases are still a little rough around the edges since these include an overhaul of the UI to use Bootstrap and jQuery and a complete rewrite of the web-based installer.

WebCalendar can be setup in a variety of ways, such as…

• A schedule management system for a single person
• A schedule management system for a group of people, allowing one or more assistants to manage the calendar of another user
• An events schedule that anyone can view, allowing visitors to submit new events
• A calendar server that can be viewed with iCalendar-compliant calendar applications like Mozilla Sunbird, Apple iCal or GNOME Evolution or RSS-enabled applications like Firefox, Thunderbird, RSSOwl, FeedDemon, or BlogExpress.

Overview of Features

• Multi-user support
• 30 supported languages: Basque, Bulgarian, Chinese-Big5, Chinese-GB2312, Czech, Danish, Dutch, English-US, Estonian, Finnish, French, Galician, German, Greek, Holo-Big5, Hungarian, Icelandic, Italian, Japanese, Korean, Norwegian, Polish, Portuguese_BR, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish, Welsh (see current list of translations here)
• Web-based installer
• Auto-detect user’s language preference from browser settings
• View calendars by day, week, month or year
• View another user’s calendar
• View one or more users’ calendar via layers on top of your own calendar
• Add/Edit/Delete users
• Add/Edit/Delete events
• Repeating events including support for overriding or deleting (exceptions)
• Configurable custom event fields
• User-configurable preferences for colors, 12/24 time format, Sun/Mon week start
• Checks for scheduling conflicts
• Email reminders for upcoming events
• Email notifications for new/updated/deleted events
• Export events to iCalendar
• Import from iCalendar/ics format
• Optional general access (no login required) to allow calendar to be viewed by people without a login (useful for event calendars)
• Users can make their calendar available publicly to anyone with an iCalendar-compliant calendar program (such as Apple’s iCal, Mozilla Calendar or Sunbird)
• Publishing of free/busy schedules (part of the iCalendar standard)
• RSS support that puts a user’s calendar into RSS
• Subscribe to “remote” calendars (hosted elsewhere on the net) in either iCalendar or hCalendar formats (WebCalendar 1.1+)
• User authentication: Web-based, HTTP, LDAP or NIS

System Requirements

• PHP 8 or later
• PHP support and access to one of the following databases:
  • SQLite
  • MySQL/MariaDB
  • Oracle
  • Postgres
  • IBM DB2
• Access to cron for Linux/Unix systems (to send out reminders)

Development Cost

The following metrics from Ohloh show how much it would have cost to commercially develop WebCalendar.

• Codebase Size: 138,588 lines
• Estimated Effort: 34 person-years
• Estimated Cost: $1,884,469
• (As of 11 August 2024)

Donations

If you’d like to help support the costs of developing, maintaining and supporting WebCalendar, please consider donating.

Developer Resources

• Github page for WebCalendar:
  • Issues
  • Pull requests
  • Wiki
  • Download the development code as a zip file

License

WebCalendar is available under the GNU General Public License, version 2.

For more information on this license:

• GNU GPL Frequently Asked Questions

Documentation

• System Administrator’s Guide
  Introduction, installation instructions and FAQ
• UPGRADING (WebCalendar 1.3.0)
  Provides instruction on upgrading to version 1.3.7 from an older version
• Database Design (WebCalendar 1.3.0)
  Version 1.2.7 database schema

Most Recent Changes

Below are the most recent source code commits to github on the master branch.

Download Metrics

• Downloads via Github: 20569
• Downloads via SourceForge: 1417217

Related Links

• Standards
  • RFC 2445: Internet Calendaring and Scheduling Core Object Specification (iCalendar)
  • CalDAV: Calendaring and Scheduling Extensions to WebDAV (DRAFT) 
    [Note: WebCalendar does not yet support CalDAV.)
• Calendar client applications – You can use the applications to view events stored in WebCalendar if you enable its publishing settings.
  • Mozilla Calendar
  • Sunbird
  • KOrganizer
  • GNOME Evolution
  • Novell/Ximian Evolution
• iCalendar/ics download sites – These sites contain calendars for holidays, sports teams schedules, music converts, etc. You can import these files into WebCalendar.
  • iCalShare
  • Apple iCal Library
  • DateDex
  • Project24: holiday and weather calendars