diff --git a/xsl/ical.xsl b/xsl/ical.xsl
index f90683107..5cdc42a1f 100644
--- a/xsl/ical.xsl
+++ b/xsl/ical.xsl
@@ -89,7 +89,16 @@
     <xsl:if test="not(string(.) = string(../start))">
       <xsl:text>DTEND:</xsl:text>
       <xsl:call-template name="date-to-hevent">
-        <xsl:with-param name="date" select="string(.)"/>
+        <xsl:with-param name="date">
+	  <xsl:choose>
+	    <xsl:when test="contains(., 'T')">
+	      <xsl:value-of select="string(.)"/>
+	    </xsl:when>
+	    <xsl:otherwise>
+	      <xsl:value-of select="date:add(., 'P1D')"/>
+	    </xsl:otherwise>
+	  </xsl:choose>
+	</xsl:with-param>
       </xsl:call-template>
       <xsl:text>&#13;&#10;</xsl:text>
     </xsl:if>
diff --git a/xsl/xcal.xsl b/xsl/xcal.xsl
index d265ccea1..cec74c9ad 100644
--- a/xsl/xcal.xsl
+++ b/xsl/xcal.xsl
@@ -70,7 +70,16 @@
     <xsl:if test="not(string(.) = string(../start))">
       <dtend>
         <xsl:call-template name="date-to-hevent">
-          <xsl:with-param name="date" select="string(.)"/>
+	  <xsl:with-param name="date">
+	    <xsl:choose>
+	      <xsl:when test="contains(., 'T')">
+		<xsl:value-of select="string(.)"/>
+	      </xsl:when>
+	      <xsl:otherwise>
+		<xsl:value-of select="date:add(., 'P1D')"/>
+	      </xsl:otherwise>
+	    </xsl:choose>
+	  </xsl:with-param>
         </xsl:call-template>
       </dtend>
     </xsl:if>