diff --git a/bin/ymd b/bin/ymd
new file mode 100755
index 0000000..84f66d5
--- /dev/null
+++ b/bin/ymd
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ -z "$*" ]
+then
+  date +"%Y%m%d"
+else
+  date +"%Y%m%d" --date "$*"
+fi