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    <p>George is correct. Adobe sneaks an undocumented ProductInfo tag that contains the compilation date in to every compiled swf. The DisplayObject.loaderInfo.bytes contains the the complete uncompressed swf that loaded the Display Object.</p> <p><a href="http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/display/DisplayObject.html#loaderInfo" rel="noreferrer">http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/display/DisplayObject.html#loaderInfo</a></p> <p>So the quickest way to get the swf's compilation date without external libraries (from a Display Object):</p> <pre><code>import flash.utils.Endian; import flash.display.LoaderInfo; import flash.utils.ByteArray; ... private function getCompilationDate():Date{ if(!stage) throw new Error("No stage"); var swf:ByteArray = stage.loaderInfo.bytes; swf.endian = Endian.LITTLE_ENDIAN; // Signature + Version + FileLength + FrameSize + FrameRate + FrameCount swf.position = 3 + 1 + 4 + (Math.ceil(((swf[8] &gt;&gt; 3) * 4 - 3) / 8) + 1) + 2 + 2; while(swf.position != swf.length){ var tagHeader:uint = swf.readUnsignedShort(); if(tagHeader &gt;&gt; 6 == 41){ // ProductID + Edition + MajorVersion + MinorVersion + BuildLow + BuildHigh swf.position += 4 + 4 + 1 + 1 + 4 + 4; var milli:Number = swf.readUnsignedInt(); var date:Date = new Date(); date.setTime(milli + swf.readUnsignedInt() * 4294967296); return date; // Sun Oct 31 02:56:28 GMT+0100 2010 }else swf.position += (tagHeader &amp; 63) != 63 ? (tagHeader &amp; 63) : swf.readUnsignedInt() + 4; } throw new Error("No ProductInfo tag exists"); } </code></pre> <p>The SWF Specification: <a href="http://www.adobe.com/content/dam/Adobe/en/devnet/swf/pdf/swf_file_format_spec_v10.pdf" rel="noreferrer">http://www.adobe.com/content/dam/Adobe/en/devnet/swf/pdf/swf_file_format_spec_v10.pdf</a></p>
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    1. CO+1. Absolutely cool. I wasn't aware that this info was available in the swf out of the box (well, at least when compiled with MXMLC). I'll keep this in mind in case I need to get the compilation date. I like the fact that you can have this data without any kind of extra build-time trickery and without having to use a full blown parser, which seems overkill if all you want is that piece of info. By the way, I wouldn't mind if @spiralganglion accepted this answer instead of the currently accepted one, as it's clearly better than mine ;)
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      1. USJuan Pablo Califano
 

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