diff --git a/rust/gigasecond/src/lib.rs b/rust/gigasecond/src/lib.rs
index 454719a..f846dc9 100644
--- a/rust/gigasecond/src/lib.rs
+++ b/rust/gigasecond/src/lib.rs
@@ -1,8 +1,7 @@
 extern crate chrono;
-use chrono::*;
+use chrono::UTC;
 
-pub fn after(date: Option<&UTC>) -> UTC {
-	let mut lived_for_date: UTC;
-	
+pub fn after(input_date: UTC) -> UTC {
+    let utc: lived_for_date = input_date + Duration::seconds(1_000_000_000);
 	return lived_for_date;
 }
\ No newline at end of file