diff --git a/org_mode_samples/timestamp/simple.org b/org_mode_samples/timestamp/simple.org
new file mode 100644
index 0000000..c84b6c7
--- /dev/null
+++ b/org_mode_samples/timestamp/simple.org
@@ -0,0 +1,14 @@
+# diary
+<%%(foo bar baz)>
+# active
+<1970-01-01 Thu 8:15rest +1w -1d>
+# inactive
+[1970-01-01 Thu 8:15rest +1w -1d]
+# active date range
+<1970-01-01 Thu 8:15rest +1w -1d>--<1970-01-01 Thu 8:15rest +1w -1d>
+# active time range
+<1970-01-01 Thu 8:15rest-13:15otherrest +1w -1d>
+# inactive date range
+[1970-01-01 Thu 8:15rest +1w -1d]--[1970-01-01 Thu 8:15rest +1w -1d]
+# inactive time range
+[1970-01-01 Thu 8:15rest-13:15otherrest +1w -1d]