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    copied!<pre><code> &lt;script language=&quot;JavaScript&quot;&gt; &lt;!-- function dstrToUTC(ds) { var dsarr = ds.split(&quot;/&quot;); var mm = parseInt(dsarr[0],10); var dd = parseInt(dsarr[1],10); var yy = parseInt(dsarr[2],10); return Date.UTC(yy,mm-1,dd,0,0,0); } function datediff(ds1,ds2) { var d1 = dstrToUTC(ds1); var d2 = dstrToUTC(ds2); var oneday = 86400000; return (d2-d1) / oneday; } // test cases are below var a; var b; a = &quot;01/09/1999&quot;; b = &quot;01/10/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;01/12/1999&quot;; b = &quot;01/19/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;01/19/1999&quot;; b = &quot;01/12/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;01/03/1999&quot;; b = &quot;01/13/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;04/30/1999&quot;; b = &quot;05/01/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;05/30/1999&quot;; b = &quot;06/01/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;02/28/1999&quot;; b = &quot;03/01/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;02/28/2000&quot;; b = &quot;03/01/2000&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;01/01/1999&quot;; b = &quot;12/31/1999&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;01/01/2000&quot;; b = &quot;12/31/2000&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); a = &quot;12/15/1999&quot;; b = &quot;01/15/2001&quot;; document.write(&quot;From &quot;+a+&quot; to &quot;+b+&quot; is &quot;+datediff(a,b)+&quot; day(s)&lt;br&gt;&quot;); // --&gt; &lt;/script&gt; </code></pre>
 

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