diff --git a/bashrc b/bashrc
index 3b5ff0a..289b360 100755
--- a/bashrc
+++ b/bashrc
@@ -547,7 +547,11 @@ tb(){
 }
 
 mkcd(){
-    if test -d "$1"
+    if test -z "$1"
+    then
+        echo "mkcd: usage: mkcd <dir>"
+        return 1
+    elif test -d "$1"
     then
         echo "Dir \"$1\" already exists."
     else
@@ -557,6 +561,12 @@ mkcd(){
     cd "$1"
 }
 
+mkcdd(){
+    # make and change date directory
+    _d=`date +%Y%m%d-%H%M%S`
+    mkcd "$_d"
+}
+
 if test -n "$TMUX" && null type reattach-to-user-namespace
 then
     alias pbpaste="reattach-to-user-namespace pbpaste"