@@ -774,7 +774,7 @@ def test_blame_preserves_line_content(self):
             self.assertEqual(lines, ["alpha   ", "beta", "\t", "crlf\r", "gamma"])
 
     def test_blame_preserves_timezones(self):
-        with fixture_repo("blame-timezones.sh") as repo:
+        with fixture_repo("blame-content.sh") as repo:
             for incremental in (False, True):
                 for rev in ("HEAD", None):
                     with self.subTest(incremental=incremental, rev=rev):
 
@@ -6,5 +6,9 @@ cd repo
 # CRLF line survive fixture creation on every platform.
 blob=$(printf 'alpha   \nbeta\n\t\ncrlf\r\ngamma\n' | git hash-object -w --stdin)
 tree=$(printf '100644 blob %s\tfile.txt\0' "$blob" | git mktree -z)
-commit=$(git -c user.name=A -c user.email=a@example.com commit-tree "$tree" -m content)
+commit=$(GIT_AUTHOR_DATE='2020-01-01T12:00:00+0530' \
+    GIT_COMMITTER_DATE='2020-01-01T13:00:00-0400' \
+    git -c user.name=A -c user.email=a@example.com commit-tree "$tree" -m content)
 git update-ref refs/heads/main "$commit"
+git reset --hard -q HEAD
+printf 'changed\n' > file.txt