Change build property name from "timestamp" to "datetime"

build.xml

@@ -75,10 +75,13 @@
     </not>
   </condition>
 
+  <!-- time & date -->
   <tstamp>
-    <format property="timestamp" pattern="yyyy-MM-dd HH:mm:ss"/>
     <format property="year" pattern="yyyy"/>
+    <format property="date" pattern="yyyy-MM-dd"/>
+    <format property="time" pattern="HH:mm:ss"/>
   </tstamp>
+  <property name="datetime" value="${date} ${time}"/>
 
   <!-- check for some executables -->
   <available property="python.present" file="python${exe.ext}" filepath="${env.PATH}"/>

buildtools/ant_modules/dist.xml

@@ -480,7 +480,7 @@
     <echo file="${src}/games/stendhal/client/StendhalBuild.java">
       package games.stendhal.client;
       public class StendhalBuild {
-      private static final String BUILD_NUMBER = "${timestamp}";
+      private static final String BUILD_NUMBER = "${datetime}";
       public static String getBuildNumber() {return BUILD_NUMBER;}
       }
     </echo>
@@ -699,7 +699,7 @@
 
       stendhal.data.build = {
         version: "${version}",
-        build: "${timestamp}",
+        build: "${datetime}",
         dist: "webclient"
       }
     </echo>