diff --git a/build.xml b/build.xml
index ef030617..819e2baa 100644
--- a/build.xml
+++ b/build.xml
@@ -379,6 +379,17 @@
 			x="extract_authorities.xsl"/>
 	</target>
 	
+	<!--
+		Extract member list for joining date backfill.
+	-->
+	<target name="extract.member.dates">
+		<echo>Extracting member dates</echo>
+		<XALAN
+			i="members.xml"
+			o="member-dates.txt"
+			x="extract_member_dates.xsl"/>
+	</target>
+
 	<!--
 		Extract embedded certificates
 	-->
diff --git a/build/extract_member_dates.xsl b/build/extract_member_dates.xsl
new file mode 100644
index 00000000..b1e69ec8
--- /dev/null
+++ b/build/extract_member_dates.xsl
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+	extract_member_dates.xsl
+	
+	XSL stylesheet that takes the UK federation members.xml file ane extracts
+	member names and joining dates in a format suitable for updating.
+	
+	Author: Ian A. Young <ian@iay.org.uk>
+
+-->
+<xsl:stylesheet version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:ukfm="http://ukfederation.org.uk/2007/01/members">
+
+	<!-- Output is plain text -->
+	<xsl:output method="text"/>
+	
+	<xsl:template match="ukfm:Member">
+		<xsl:value-of select="ukfm:JoinDate"/>
+		<xsl:text>,"</xsl:text>
+		<xsl:value-of select="md:OrganizationName"/>
+		<xsl:text>"&#x0a;</xsl:text>
+	</xsl:template>
+
+	<!--
+		Junk any extraneous text nodes.
+	-->
+	<xsl:template match="text()">
+		<!-- do nothing -->
+	</xsl:template>
+	
+</xsl:stylesheet>