diff --git a/inc/always.php b/inc/always.php
index c06046af..221e5b21 100644
--- a/inc/always.php
+++ b/inc/always.php
@@ -257,3 +257,12 @@ function ConstructURL( $partial_path ) {
   return $url;
 }
 
+
+/**
+* Convert a date from ISO format into the sad old HTTP format.
+* @param string $isodate The date to convert
+*/
+function ISODateToHTTPDate( $isodate ) {
+  // Use strtotime since strptime is not available on Windows platform.
+  return( gmstrftime('%a, %d %b %Y %T GMT', strtotime($isodate)) );
+}
diff --git a/inc/always.php.in b/inc/always.php.in
index d490dd82..e897402b 100644
--- a/inc/always.php.in
+++ b/inc/always.php.in
@@ -257,3 +257,12 @@ function ConstructURL( $partial_path ) {
   return $url;
 }
 
+
+/**
+* Convert a date from ISO format into the sad old HTTP format.
+* @param string $isodate The date to convert
+*/
+function ISODateToHTTPDate( $isodate ) {
+  // Use strtotime since strptime is not available on Windows platform.
+  return( gmstrftime('%a, %d %b %Y %T GMT', strtotime($isodate)) );
+}