add lastBuildDate and check for negative pubDate

xsl/podcast.xsl

@@ -126,6 +126,7 @@
 		<description><xsl:value-of select="$poddesc"/></description>
 		<language>de-DE</language>
 		<copyright>https://creativecommons.org/licenses/by-sa/2.0/de/</copyright>
+		<lastBuildDate><xsl:call-template name="date-to-rfc822"><xsl:with-param name="date" select="date:date-time()"/><!--xsl:with-param name="tz">+0200</xsl:with-param--></xsl:call-template></lastBuildDate>
 	    <image>
 	      <title><xsl:value-of select="$imgtitle"/></title>
 	      <url><xsl:value-of select="$imgurl"/></url>
@@ -148,11 +149,6 @@
         <itunes:explicit>no</itunes:explicit>
 
         <!--generator>C3D2 custom XSLT</generator-->
-        <!--lastBuildDate>
-          <xsl:call-template name="date-to-rfc822">
-            <xsl:with-param name="date" select="$builddate"/>
-          </xsl:call-template>
-        </lastBuildDate-->
         <podcast:locked owner="{$mailto}">no</podcast:locked>
         <podcast:funding url="https://c3d2.de/unterstuetzen.html">C3D2 Unterstützen!</podcast:funding>
         <podcast:funding url="https://c3d2.de/membership.html">Mitglied werden!</podcast:funding>
@@ -201,7 +197,14 @@
 
         <xsl:for-each select="newsfile">
           <xsl:sort select="date:seconds(document(.)/item/@date)" data-type="number" order="descending" />
-	  <xsl:if test="position() &lt;= $maxitems">
+	  <xsl:if test="position() &lt;= $maxitems and
+                    starts-with(
+                      date:difference(
+                        date:date-time(),
+                        concat(document(.)/item/@date, '+01:00')
+                      ),
+                      '-'
+                    )">
 	    <xsl:choose>
 	      <xsl:when test="($selection = 'pentaradio' or $selection = 'pentamedia') and
 			      starts-with(., 'content/news/pentaradio') and