diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0e1cc8e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+2011*
diff --git a/Makefile b/Makefile
index be05f0b..7a58f37 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-DATESTAMP=`date -u +%Y.%m%d.%H%M`
+DATESTAMP := $(shell date -u +%Y.%m%d.%H%M)
 
 all:
 	mkdir $(DATESTAMP)