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WebCalendar

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

License

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

For more information on this license:

Documentation

Most Recent Changes

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

Recent Commits to webcalendar:master

  • SQLite3 fixes for dbi4php.php and SQL used during install (#587)
    by craigk5n on September 12, 2025 at 2:33 pm

    SQLite3 fixes for dbi4php.php and SQL used during install (#587) – Refactor SQLite3 installation and headless setup for WebCalendar – Replaced legacy `populate_sqlite_db` with new `populate_sqlite3_db`: – Moved SQL schema into `install/sql/tables-sqlite3.php` as an array of statements. – Added robust error handling, logging, and execution validation. – Centralized schema creation for reuse in installation and upgrades. – Updated `install/headless.php`: – Supports `–debug` CLI flag for verbose output. – Loads configuration from `settings.php` or environment variables (`WEBCALENDAR_USE_ENV`). – Starts session early to avoid header warnings. – Improved messaging and error handling. – Modified workflow script (`test-install.yml`) to: – Include `config.php` for `getSessionName()`. – Start session before installation. – Run installer with `–debug` and suppress PHP error display. – Fixed SQLite error handling in `dbi4php.php`: – Initialized `$db_sqlite_error_str` to prevent undefined variable warnings. – Added better handling for missing SQLite connections. – Adjusted `install_functions.php` and `install_dbtables_handler.php` to use `populate_sqlite3_db`. – Added `WEBCALENDAR_USE_ENV` flag into `$settings` for clarity in `config.php`. – Removed legacy `tools/populate_sqlite3.php` (obsolete). – Dropped `webcal_translations` table creation from `upgrade.sql` (redundant).

  • update composer.json / lock (#575)
    by bbannon on September 5, 2025 at 12:49 pm

    update composer.json / lock (#575) * update composer.json / lock * Add PHP cs fixer

  • Bump actions/checkout from 4 to 5 (#583)
    by dependabot on September 5, 2025 at 12:41 pm

    Bump actions/checkout from 4 to 5 (#583) Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5. – [Release notes](https://github.com/actions/checkout/releases) – [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md) – [Commits](https://github.com/actions/checkout/compare/v4…v5) — updated-dependencies: – dependency-name: actions/checkout dependency-version: ‘5’ dependency-type: direct:production update-type: version-update:semver-major … Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

  • Add new GitHub workflow to perform test install
    by craigk5n on September 4, 2025 at 7:26 pm

    Add new GitHub workflow to perform test install * Add new GitHub workflow that will perform a test install with SQLite and then try to login * Switch to sqlite3 for test since sqlite is no longer available in PHP8 * Add debug output to headless.php

  • Merge pull request #573 from craigk5n/dependabot/github_actions/actio…
    by craigk5n on September 4, 2025 at 2:11 pm

    Merge pull request #573 from craigk5n/dependabot/github_actions/actions/checkout-5 Bump actions/checkout from 4 to 5

Download Metrics

  • Downloads via Github: 19317
  • Downloads via SourceForge:

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.
  • iCalendar/ics download sites – These sites contain calendars for holidays, sports teams schedules, music converts, etc. You can import these files into WebCalendar.