diff --git a/src/time/cuc.rs b/src/time/cuc.rs
index dc121ad..382ec84 100644
--- a/src/time/cuc.rs
+++ b/src/time/cuc.rs
@@ -828,8 +828,8 @@ mod tests {
 
     #[test]
     fn test_basic_zero_epoch() {
-        // Include leap second correction for this.
-        let zero_cuc = TimeProviderCcsdsEpoch::new(0, LEAP_SECONDS);
+        // Do not include leap second corrections, which do not apply to dates before 1972.
+        let zero_cuc = TimeProviderCcsdsEpoch::new(0, 0);
         assert_eq!(zero_cuc.len_as_bytes(), 5);
         assert_eq!(zero_cuc.width(), zero_cuc.width_counter_pair().0);
         assert_eq!(zero_cuc.counter(), zero_cuc.width_counter_pair().1);
@@ -842,12 +842,12 @@ mod tests {
         let dt = zero_cuc.chrono_date_time();
         assert!(dt.is_some());
         let dt = dt.unwrap();
-        assert_eq!(dt.year(), 1957);
-        assert_eq!(dt.month(), 12);
-        assert_eq!(dt.day(), 31);
-        assert_eq!(dt.hour(), 23);
-        assert_eq!(dt.minute(), 59);
-        assert_eq!(dt.second(), 23);
+        assert_eq!(dt.year(), 1958);
+        assert_eq!(dt.month(), 1);
+        assert_eq!(dt.day(), 1);
+        assert_eq!(dt.hour(), 0);
+        assert_eq!(dt.minute(), 0);
+        assert_eq!(dt.second(), 0);
     }
 
     #[test]