diff --git a/gix-blame/src/file/function.rs b/gix-blame/src/file/function.rs
index 05293053231..76e8f68e4fe 100644
--- a/gix-blame/src/file/function.rs
+++ b/gix-blame/src/file/function.rs
@@ -106,8 +106,9 @@ pub fn file(
 
     let (mut buf, mut buf2) = (Vec::new(), Vec::new());
     let commit = find_commit(cache.as_ref(), &odb, &suspect, &mut buf)?;
-    let mut queue: gix_revwalk::PriorityQueue<CommitTime, ObjectId> = gix_revwalk::PriorityQueue::new();
-    queue.insert(commit_time(commit)?, suspect);
+    let mut queue: gix_revwalk::PriorityQueue<gix_date::SecondsSinceUnixEpoch, ObjectId> =
+        gix_revwalk::PriorityQueue::new();
+    queue.insert(commit.commit_time()?, suspect);
 
     let mut out = Vec::new();
     let mut diff_state = gix_diff::tree::State::default();
@@ -126,7 +127,7 @@ pub fn file(
         }
 
         let commit = find_commit(cache.as_ref(), &odb, &suspect, &mut buf)?;
-        let commit_time = commit_time(commit)?;
+        let commit_time = commit.commit_time()?;
 
         if let Some(since) = options.since {
             if commit_time < since.seconds {
@@ -651,17 +652,6 @@ fn find_path_entry_in_commit(
     Ok(res.map(|e| e.oid))
 }
 
-type CommitTime = i64;
-
-fn commit_time(commit: gix_traverse::commit::Either<'_, '_>) -> Result<CommitTime, gix_object::decode::Error> {
-    match commit {
-        gix_traverse::commit::Either::CommitRefIter(commit_ref_iter) => {
-            commit_ref_iter.committer().map(|c| c.seconds())
-        }
-        gix_traverse::commit::Either::CachedCommit(commit) => Ok(commit.committer_timestamp() as i64),
-    }
-}
-
 type ParentIds = SmallVec<[(gix_hash::ObjectId, i64); 2]>;
 
 fn collect_parents(
diff --git a/gix-traverse/src/commit/mod.rs b/gix-traverse/src/commit/mod.rs
index 35bca8f2b6a..59c51e72c23 100644
--- a/gix-traverse/src/commit/mod.rs
+++ b/gix-traverse/src/commit/mod.rs
@@ -77,7 +77,7 @@ pub enum Either<'buf, 'cache> {
 }
 
 impl Either<'_, '_> {
-    /// Get a commits `tree_id` by either getting it from a [`gix_commitgraph::Graph`], if
+    /// Get a commit’s `tree_id` by either getting it from a [`gix_commitgraph::Graph`], if
     /// present, or a [`gix_object::CommitRefIter`] otherwise.
     pub fn tree_id(self) -> Result<ObjectId, gix_object::decode::Error> {
         match self {
@@ -85,6 +85,15 @@ impl Either<'_, '_> {
             Self::CachedCommit(commit) => Ok(commit.root_tree_id().into()),
         }
     }
+
+    /// Get a committer timestamp by either getting it from a [`gix_commitgraph::Graph`], if
+    /// present, or a [`gix_object::CommitRefIter`] otherwise.
+    pub fn commit_time(self) -> Result<gix_date::SecondsSinceUnixEpoch, gix_object::decode::Error> {
+        match self {
+            Self::CommitRefIter(commit_ref_iter) => commit_ref_iter.committer().map(|c| c.seconds()),
+            Self::CachedCommit(commit) => Ok(commit.committer_timestamp() as gix_date::SecondsSinceUnixEpoch),
+        }
+    }
 }
 
 /// Find information about a commit by either getting it from a [`gix_commitgraph::Graph`], if