Extensive iCalendar Support - Zap Calendar was written from the ground up to fully support the iCalendar standard (iCalendar is the standard format for transferring calendar events between applications). Zap Calendar provides full import, export and synchronization of calendar events to and from external sources (including deleted events). Using a calendar program such as Outlook, Thunderbird or Google Calendar and devices like the iPod or iPad, downloading or uploading a single event or an entire calendar with 1,000's of events can be done easily with Zap Calendar. iCalendar repeating events are also fully supported. Using the iCal subscribe plugin (available in Zap Calendar Pro), you can synchronize events created on remote calendars with Zap Calendar, allowing automatic updating of your calendar when an event changes in a remote calendar.

Module and Plugin Addons – Zap Calendar can be extended using Zap Calendar modules plugins. With over 2 dozen to choose from , these addons provide additional functionality to the calendar, including searching, weather, mapping, captcha, RSVP, moon phases, commenting and social networking support.

Third Party Application Support – Zap Calendar provides support for several popular Joomla extensions, including Community Builder, JomSocial, sh404SEF and Zap Weather. Zap Calendar also includes a plugin for Google Maps for displaying events on a map.

AJAX Support – Zap Calendar supports AJAX, which allows users to browse the calendar by event, day, week, month or year without ever refreshing the screen page. AJAX is supported for both Zap Calendar component pages and modules.

Social Networking Support – Zap Calendar users can post events to popular social network sites like Facebook and Twitter using the "share your event" option. Events can include a Facebook "like" button. Users can comment and RSVP to events using the provided plugins. Zap Calendar provides support for Community Builder and JomSocial.

Event Management – Multiple categories per event, repeating events, linking events to articles, front-end add/edit/delete events, location/venue support (new!), quick event creation mode, import events from a CSV file, iCalendar file or URL.

Calendar Management - Multiple calendars per site, multiple calendars per page (via modules), personal calendars, spanning events and categories across multiple calendars, flat and tree-based category layouts, theme support, display/hide event categories on a calendar.