diff --git a/src/notification.rs b/src/notification.rs
index 264c93e..ee4a709 100644
--- a/src/notification.rs
+++ b/src/notification.rs
@@ -86,19 +86,6 @@ pub async fn notify_build(
     }
 }
 
-fn should_notify_since_last_notification(
-    last_notification: jiff::Timestamp,
-    now: jiff::Timestamp,
-) -> bool {
-    now.since(last_notification).is_ok_and(|diff| {
-        diff.total((
-            jiff::Unit::Month,
-            &last_notification.to_zoned(jiff::tz::TimeZone::UTC),
-        ))
-        .is_ok_and(|diff_months| diff_months >= 1.0)
-    })
-}
-
 pub async fn notify_build_failure(
     github_client: &GitHubClient,
     db: &Db,
@@ -126,7 +113,9 @@ pub async fn notify_build_failure(
 
         if issue.last_update_date.is_none_or(|last_update_date| {
             jiff::Timestamp::from_millisecond(last_update_date).is_ok_and(|last_update_date| {
-                should_notify_since_last_notification(last_update_date, jiff::Timestamp::now())
+                jiff::Timestamp::now()
+                    .since(last_update_date)
+                    .is_ok_and(|diff| diff.get_months() > 0)
             })
         }) {
             info!(
@@ -285,22 +274,3 @@ pub async fn notify_build_pass(
 
     Ok(())
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn should_notify_since_last_notification() {
-        assert!(super::should_notify_since_last_notification(
-            "2025-11-01T00:00:00Z".parse().unwrap(),
-            "2025-12-02T00:00:00Z".parse().unwrap()
-        ));
-        assert!(super::should_notify_since_last_notification(
-            "2025-09-01T00:00:00Z".parse().unwrap(),
-            "2025-12-02T00:00:00Z".parse().unwrap()
-        ));
-        assert!(!super::should_notify_since_last_notification(
-            "2025-11-02T00:00:00Z".parse().unwrap(),
-            "2025-12-01T00:00:00Z".parse().unwrap()
-        ));
-    }
-}