Simplified getting the commit date using git log --pretty. Fixed missing date in ant build.

Makefile

@@ -32,7 +32,7 @@ VER = sed s/@VERSION/${JQ_VER}/
 RHINO = java -jar ${BUILD_DIR}/js.jar
 MINJAR = java -jar ${BUILD_DIR}/google-compiler-20091218.jar
 
-DATE=`git log -1 | grep Date: | sed 's/[^:]*: *//'`
+DATE=`git log -1 --pretty=format:%ad`
 
 all: jquery lint min
 	@@echo "jQuery build complete."

build.xml

@@ -60,6 +60,9 @@
             <fileset file="src/outro.js" />
         </concat>
     	<replaceregexp match="@VERSION" replace="${version}" flags="g" byline="true" file="${JQ}" />
+		<exec executable="git" outputproperty="date">
+			<arg line="log -1 --pretty=format:%ad"/>
+		</exec>
 		<replaceregexp match="Date: " replace="Date: ${date}" file="${JQ}" />
         <echo message="${JQ} built." />
     </target>