---
title: Calendar
slug: Mozilla/Calendar
tags:
  - Calendar
  - NeedsTranslation
  - NeedsUpdate
  - TopicStub
translation_of: Mozilla/Calendar
---
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    <p><span class="seoSummary">The Mozilla Calendar Project is a community driven project based on the Mozilla application architecture. The Project's heart is a calendaring backend based on libical. The <a class="external" href="http://www.mozilla.org/projects/calendar/lightning/" title="http://www.mozilla.org/projects/calendar/lightning/">Lightning extension</a> is built on top of this platform and provides integrated calendaring capabilities for Mozilla Messaging's Email client <a class="internal" href="/en/Thunderbird" title="En/Thunderbird">Thunderbird</a>.</span></p>

    <p>Mozilla Calendar emphasizes free and open source technology and supports standardized technology like the ical/ics (<a class="external" href="http://tools.ietf.org/html/rfc2445" title="http://tools.ietf.org/html/rfc2445">rfc2445</a>) format and the CalDAV (<a class="external" href="http://tools.ietf.org/html/rfc4791" title="http://tools.ietf.org/html/rfc4791">rfc4791</a>) protocol, which is implemented by many freely available servers and also some commercial providers.</p>
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    <h2 id="Development_Topics">Development Topics</h2>

    <dl>
     <dt><a class="internal" href="/en/Simple_Sunbird_build" title="en/Simple Sunbird build">Building Calendar</a></dt>
     <dd>Information about building Calendar with the new <a class="internal" href="/en/comm-central" title="en/comm-central">comm-central</a> repository. There is also a simple build page for <a class="internal" href="/en/Simple_Thunderbird_build#Building_Thunderbird_and_Lightning" title="en/Simple Thunderbird build#Building Thunderbird and Lightning">Thunderbird including Lightning</a> and information about <a class="internal" href="/en/How_comm-central's_build_system_works" title="en/How comm-central's build system works">how comm-central works</a>.</dd>
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     <dt><a class="link-https" href="https://wiki.mozilla.org/Calendar:Creating_an_Extension" title="https://wiki.mozilla.org/Calendar:Creating_an_Extension">Creating a Calendar extension</a></dt>
     <dd>Tutorial on creating a Calendar extension for Sunbird and Lightning.</dd>
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     <dt><a class="internal" href="/en/Calendar/Localization" title="En/Calendar/Localization"><strong>Localization</strong></a></dt>
     <dd>How to get started with translating Calendar into your language and how to build Lightning in your language. </dd>
     <dt>Testing Calendar</dt>
     <dd><a class="internal" href="/en/Calendar/MozMill_Testing" title="En/Calendar/MozMill Testing">CalendarUtils reference</a> for writing <a class="internal" href="/en/Mozmill_Tests" title="en/Mozmill Tests">Mozmill tests</a>, which can automatically test the UI so that regressions can be easily found.</dd>
     <dt><a href="/en/Calendar/Calendar_Versions" title="en/Calendar/Calendar Versions">Calendar Versions</a></dt>
     <dd>This page will tell you which Calendar version fits with which Mozilla Platform and where current development is being done.</dd>
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    <h2 id="Tools">Tools</h2>

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     <dt><a class="link-https" href="https://bugzilla.mozilla.org/query.cgi?format=specific&amp;product=Calendar" title="https://bugzilla.mozilla.org/query.cgi?format=specific&amp;product=Calendar">Bugzilla</a></dt>
     <dd>The <a class="internal" href="/en/Bugzilla" title="En/Bugzilla">Bugzilla</a> database used to track issues for Mozilla projects.</dd>
     <dt><a class="link-https" href="https://wiki.mozilla.org/Calendar:QA_CalDAV_Support" title="https://wiki.mozilla.org/Calendar:QA_CalDAV_Support">Calendar Servers</a></dt>
     <dd>Setup your own calendar server, or check to see how well commercial products are supported.</dd>
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