Use ISO 8601 formatting for dates in filters

lib/OpenLayers/Format/Filter/v1.js

@@ -6,6 +6,7 @@
  * @requires OpenLayers/Format/Filter.js
  * @requires OpenLayers/Format/XML.js
  * @requires OpenLayers/Filter/Function.js
+ * @requires OpenLayers/BaseTypes/Date.js
  */
 
 /**
@@ -405,7 +406,9 @@ OpenLayers.Format.Filter.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
                 });
             },
             "Literal": function(value) {
-                // no ogc:expression handling for now
+                if (value instanceof Date) {
+                    value = OpenLayers.Date.toISOString(value);
+                }
                 return this.createElementNSPlus("ogc:Literal", {
                     value: value
                 });

tests/Format/Filter/v1.html

@@ -247,6 +247,30 @@
     }
 
 
+    function test_date_writing(t) {
+        t.plan(1);
+
+        // ISO 8601: 2010-11-27T18:19:15.123Z
+        var start = new Date(Date.UTC(2010, 10, 27, 18, 19, 15, 123));
+
+        // ISO 8601: 2011-12-27T18:19:15.123Z
+        var end = new Date(Date.UTC(2011, 11, 27, 18, 19, 15, 123));
+
+        var filter = new OpenLayers.Filter.Comparison({
+            type: OpenLayers.Filter.Comparison.BETWEEN,
+            property: "when",
+            lowerBoundary: start,
+            upperBoundary: end
+        });
+
+        var format = new OpenLayers.Format.Filter.v1_0_0();
+
+        var got = format.write(filter);
+        var exp = readXML("BetweenDates");
+        t.xml_eq(got, exp, "comparison filter with dates");
+    }
+
+
     function readXML(id) {
         var xml = document.getElementById(id).firstChild.nodeValue;
         return new OpenLayers.Format.XML().read(xml).documentElement;
@@ -288,6 +312,19 @@
     </ogc:Not>
 </ogc:Filter>
 --></div>
+<div id="BetweenDates"><!--
+<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
+    <ogc:PropertyIsBetween>
+        <ogc:PropertyName>when</ogc:PropertyName>
+        <ogc:LowerBoundary>
+            <ogc:Literal>2010-11-27T18:19:15.123Z</ogc:Literal>
+        </ogc:LowerBoundary>
+        <ogc:UpperBoundary>
+            <ogc:Literal>2011-12-27T18:19:15.123Z</ogc:Literal>
+        </ogc:UpperBoundary>
+    </ogc:PropertyIsBetween>
+</ogc:Filter>
+--></div>
 
 </body> 
 </html>