diff --git a/modules/build-date.xml b/modules/build-date.xml
index fbda91d..159c178 100755
--- a/modules/build-date.xml
+++ b/modules/build-date.xml
@@ -133,10 +133,10 @@
 			
 			<xsl:choose>
 				<xsl:when test="$format = 'short'">
-					<xsl:sequence select="format-dateTime( $date-built, '[Y,4]-[M,2]-[D,2]' )" />
+					<xsl:sequence select="format-dateTime( $date-built, '[Y0001]-[M01]-[D01]' )" />
 				</xsl:when>
 				<xsl:when test="$format = 'long'">
-					<xsl:sequence select="format-dateTime( $date-built, '[Y,4]-[M,2]-[D,2] [H,2]:[m,2]:[s,2]' )" />
+					<xsl:sequence select="format-dateTime( $date-built, '[Y0001]-[M01]-[D01] [H01]:[m01]:[s01]' )" />
 				</xsl:when>
 				<!-- Assume it's a date picture string otherwise. -->
 				<xsl:otherwise>