commit - 3fe1abad43f057903efb7980e29ce93af766891e
commit + 6e790f45d64975dc0b774d672fa3577dfcfafdc9
blob - 54d808ec2c08ac0e57c12400068fb20edd2302b2
blob + 6a104bbde53b6ab5aa419027b762dc8b49c7426a
--- include/got_object.h
+++ include/got_object.h
@@ -122,6 +122,14 @@ const struct got_error *got_object_commit_open(struct 
 /* Dispose of a commit object. */
 void got_object_commit_close(struct got_commit_object *);
 
+/* Get the commit's committer timestamp (in UTC). */
+const struct got_error *got_object_commit_get_committer_time(time_t *,
+    struct got_commit_object *);
+
+/* Get the commit's author timestamp (in UTC). */
+const struct got_error *got_object_commit_get_committer_time(time_t *,
+    struct got_commit_object *);
+
 /*
  * Attempt to open a tree object in a repository.
  * The provided object must be of type GOT_OBJ_TYPE_TREE.
blob - 7dd5b8be427df3a57ec980255b2022c804e2f12d
blob + 5d6edcfd4343961cb8e7b00e4596e9d0fff68613
--- lib/commit_graph.c
+++ lib/commit_graph.c
@@ -132,43 +132,6 @@ static int
 is_root_node(struct got_commit_graph_node *node)
 {
 	return node->commit->nparents == 0;
-}
-
-static const struct got_error *
-parse_commit_time(int64_t *time, struct got_commit_object *commit)
-{
-	const struct got_error *err = NULL;
-	const char *errstr;
-	char *committer, *space;
-
-	*time = 0;
-
-	committer = strdup(commit->committer);
-	if (committer == NULL)
-		return got_error_from_errno();
-
-	/* Strip off trailing timezone indicator. */
-	space = strrchr(committer, ' ');
-	if (space == NULL) {
-		err = got_error(GOT_ERR_BAD_OBJ_DATA);
-		goto done;
-	}
-	*space = '\0';
-
-	/* Timestamp is separated from committer name + email by space. */
-	space = strrchr(committer, ' ');
-	if (space == NULL) {
-		err = got_error(GOT_ERR_BAD_OBJ_DATA);
-		goto done;
-	}
-
-	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
-	if (errstr)
-		err = got_error(GOT_ERR_BAD_OBJ_DATA);
-
-done:
-	free(committer);
-	return err;
 }
 
 static const struct got_error *
@@ -178,10 +141,11 @@ compare_commits(int *cmp, struct got_commit_object *c1
 	const struct got_error *err;
 	int64_t t1, t2;
 
-	err = parse_commit_time(&t1, c1);
+	err = got_object_commit_get_committer_time(&t1, c1);
 	if (err)
 		return err;
-	err = parse_commit_time(&t2, c2);
+	err = got_object_commit_get_committer_time(&t2, c2);
+
 	if (err)
 		return err;
 
blob - fd3ef97d777386e079ab697ef1959196c6ac765e
blob + 679abeccb798c260183c7938c2b076e5824d5197
--- lib/object.c
+++ lib/object.c
@@ -580,7 +580,58 @@ done:
 	}
 	return err;
 }
+
+static const struct got_error *
+parse_commit_time(time_t *time, const char *author_str)
+{
+	const struct got_error *err = NULL;
+	const char *errstr;
+	char *committer, *space;
 
+	*time = 0;
+
+	committer = strdup(author_str);
+	if (committer == NULL)
+		return got_error_from_errno();
+
+	/* Strip off trailing timezone indicator. */
+	space = strrchr(committer, ' ');
+	if (space == NULL) {
+		err = got_error(GOT_ERR_BAD_OBJ_DATA);
+		goto done;
+	}
+	*space = '\0';
+
+	/* Timestamp is separated from committer name + email by space. */
+	space = strrchr(committer, ' ');
+	if (space == NULL) {
+		err = got_error(GOT_ERR_BAD_OBJ_DATA);
+		goto done;
+	}
+
+	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
+	if (errstr)
+		err = got_error(GOT_ERR_BAD_OBJ_DATA);
+
+done:
+	free(committer);
+	return err;
+}
+
+const struct got_error *
+got_object_commit_get_committer_time(time_t *time,
+    struct got_commit_object *commit)
+{
+	return parse_commit_time(time, commit->committer);
+}
+
+const struct got_error *
+got_object_commit_get_author_time(time_t *time,
+    struct got_commit_object *commit)
+{
+	return parse_commit_time(time, commit->committer);
+}
+
 static void
 tree_entry_close(struct got_tree_entry *te)
 {