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copied!<p>Valid question; it is always better not to use arbitrary codes for such things. </p> <p>You can simply use the <a href="http://unicode.org/repos/cldr/trunk/common/bcp47/calendar.xml" rel="nofollow">values of <code>name</code> attribute</a> which CLDR uses:</p> <pre><code><key name="ca" description="Calendar algorithm key" alias="calendar"> <type name="buddhist" description="Thai Buddhist calendar"/> <type name="chinese" description="Traditional Chinese calendar"/> <type name="coptic" description="Coptic calendar"/> ... <type name="islamicc" description="Civil (algorithmic) Arabic calendar" deprecated="true" preferred="islamic-civil" alias="islamic-civil"/> </key> </code></pre> <p>But you can also, adapt the method that was used in CLDR data definition which consisted of using an extension to <a href="http://tools.ietf.org/html/bcp47" rel="nofollow">BCP47</a> ("<em>Tags for Identifying Languages</em>") called <a href="http://tools.ietf.org/html/rfc6067" rel="nofollow">RFC6067</a> for "identifying Unicode locale-based variations using language tags. The 'singleton' identifier for this extension is 'u'". For example, the language Thai is identified by <code>th</code>. Therefore, <code>th-u-ca-buddhist</code> identifies the locale as Thai with support for Buddhist calendar:</p> <pre><code> th-u-ca-buddhist | | | | | +--> Calendar name (values in CLDR bcp47/calendar.xml). | +-----> 2 char key defining extension to follow (here "ca" for calendar). +--------> Identifies that extension U values are to follow. </code></pre> <p>Few more extended usage examples:</p> <ul> <li><code>fa-u-ca-islamic-rgsa</code>: Farsi with Islamic calendar, Saudi Arabia sighting.</li> <li><code>fa-u-ca-persian</code>: Farsi with Persian calendar.</li> <li><code>fa_AF-u-ca-persian</code>: Farsi (Afghanistan) with Persian calendar.</li> </ul> <p>Obviously, if your intention is just to store the date and identifier for the calendar it is in, you can use <code>en</code>; i.e.</p> <pre><code> { 'year': 1392, 'month': 6 , 'day': 31 , 'calendar': 'en-u-ca-persian' } </code></pre>

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