Solve rust/gigasecond

rust/gigasecond/src/lib.rs

@@ -1,6 +1,6 @@
-use time::PrimitiveDateTime as DateTime;
+use time::{ext::NumericalDuration, PrimitiveDateTime as DateTime};
 
 // Returns a DateTime one billion seconds after start.
 pub fn after(start: DateTime) -> DateTime {
-    todo!("What time is a gigasecond later than {start}");
+    start + 1_000_000_000.seconds()
 }

rust/gigasecond/tests/gigasecond.rs

@@ -20,7 +20,6 @@ fn date() {
 }
 
 #[test]
-#[ignore]
 fn another_date() {
     let start_date = dt(1977, 6, 13, 0, 0, 0);
 
@@ -28,7 +27,6 @@ fn another_date() {
 }
 
 #[test]
-#[ignore]
 fn third_date() {
     let start_date = dt(1959, 7, 19, 0, 0, 0);
 
@@ -36,7 +34,6 @@ fn third_date() {
 }
 
 #[test]
-#[ignore]
 fn datetime() {
     let start_date = dt(2015, 1, 24, 22, 0, 0);
 
@@ -44,7 +41,6 @@ fn datetime() {
 }
 
 #[test]
-#[ignore]
 fn another_datetime() {
     let start_date = dt(2015, 1, 24, 23, 59, 59);