[chromecast] Added pattern for DateTime channel types (openhab#11694)

* Added pattern for DateTime channel types

Signed-off-by: Christoph Weitkamp <github@christophweitkamp.de>
Signed-off-by: Michael Schmidt <mi.schmidt.83@gmail.com>

bundles/org.openhab.binding.chromecast/src/main/resources/OH-INF/thing/thing-types.xml

@@ -244,7 +244,8 @@
 		<item-type>DateTime</item-type>
 		<label>Broadcast Date</label>
 		<description>The broadcast date of the currently playing media</description>
-		<state readOnly="true"/>
+		<category>Calendar</category>
+		<state readOnly="true" pattern="%1$tY-%1$tm-%1$td"/>
 	</channel-type>
 
 	<channel-type id="composer" advanced="true">
@@ -258,7 +259,8 @@
 		<item-type>DateTime</item-type>
 		<label>Creation Date</label>
 		<description>The creation date of the currently playing media</description>
-		<state readOnly="true"/>
+		<category>Calendar</category>
+		<state readOnly="true" pattern="%1$tY-%1$tm-%1$td"/>
 	</channel-type>
 
 	<channel-type id="discNumber" advanced="true">
@@ -300,7 +302,8 @@
 		<item-type>DateTime</item-type>
 		<label>Release Date</label>
 		<description>The release date of the currently playing media</description>
-		<state readOnly="true"/>
+		<category>Calendar</category>
+		<state readOnly="true" pattern="%1$tY-%1$tm-%1$td"/>
 	</channel-type>
 
 	<channel-type id="seasonNumber" advanced="true">