WebCalendar - k5n.us

Table of Contents

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.

Recent Commits to webcalendar:master

chore: remove resolved errors from PHPStan baseline
by craigk5n on March 26, 2026 at 4:26 pm
chore: remove resolved errors from PHPStan baseline Remove baseline entries for $time (edit_entry.php), $invalidFirstName and $invalidLastName (users_ajax.php) which were fixed in earlier commits and caused unmatched-ignore-pattern failures in CI.
fix: time selection dropdowns wrapping vertically in Repeat/Reminders…
by craigk5n on March 26, 2026 at 4:19 pm
fix: time selection dropdowns wrapping vertically in Repeat/Reminders tabs (#625) Wrap time_selection() output in a form-inline span so the hour/minute selects render inline regardless of the parent container. This fixes the layout in Repeat and Reminders tabs where the selects were inside bare <td> elements without form-inline.
fix: add missing globals for name validation in save_user() (#498)
by craigk5n on March 26, 2026 at 4:10 pm
fix: add missing globals for name validation in save_user() (#498) $invalidFirstName and $invalidLastName were referenced in save_user() without being declared global, so the validation silently did nothing.
fix: end time wrapping on separate lines in event editor (#596)
by craigk5n on March 26, 2026 at 3:14 pm
fix: end time wrapping on separate lines in event editor (#596) Add missing form-inline class, visibility:hidden style, and close the unclosed <label> tag on the timeentryend div to match the sibling timeentrystart and timeentryduration divs.
fix: don’t recommend deleting wizard dir; handle missing wizard grace…
by craigk5n on March 26, 2026 at 3:10 pm
fix: don’t recommend deleting wizard dir; handle missing wizard gracefully (#610) – Replace “delete wizard/” advice on finish page with recommendation to run Security Audit after logging in – Add wizard directory presence check to security_audit.php – Guard all wizard redirects in config.php with file_exists() so users get a clear error message instead of a 404 if the wizard is gone

Download Metrics

Downloads via Github: 20104
Downloads via SourceForge: