From e3166d1ea40d88ccf7b00ed7f2101c9a9de48ce9 Mon Sep 17 00:00:00 2001
From: Dario Kampkaspar <dariok@web.de>
Date: Wed, 25 Mar 2026 01:44:17 +0100
Subject: [PATCH] Improve date-time handling in parameters.xql

Handle non-castable dateTime values by parsing IETF date format.
---
 content/parameters.xql | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/content/parameters.xql b/content/parameters.xql
index cdf9d8b..6688fb8 100644
--- a/content/parameters.xql
+++ b/content/parameters.xql
@@ -232,7 +232,9 @@ declare %private function parameters:cast-value ($value as item()?, $schema as m
                 case "date" return
                     xs:date($value)
                 case "date-time" return
-                    xs:dateTime($value)
+                    if ( $value castable as xs:dateTime )
+                        then xs:dateTime($value)
+                        else parse-ietf-date($value) (: Headers like If-Modified-Since are formatted as IETF date which is not castable as xs:dateTime :)
                 case "binary" return
                     xs:base64Binary($value)
                 case "byte" return
@@ -243,4 +245,4 @@ declare %private function parameters:cast-value ($value as item()?, $schema as m
 
         default return
             string($value)
-};
\ No newline at end of file
+};