diff --git a/exercises/gigasecond/src/lib.rs b/exercises/gigasecond/src/lib.rs
index e69de29bb..8fc2085bc 100644
--- a/exercises/gigasecond/src/lib.rs
+++ b/exercises/gigasecond/src/lib.rs
@@ -0,0 +1,7 @@
+extern crate chrono;
+use chrono::*;
+
+// Returns a UTC DateTime one billion seconds after start.
+pub fn after(start: DateTime<UTC>) -> DateTime<UTC> {
+    unimplemented!()
+}