Simplified git log date retrieval using format options

Author: Craga89

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 --pretty=format:'%ad' -1`
 
 all: jquery lint min
 	@@echo "jQuery build complete."