🚧 Add file time information in commit message

src/git_auto_tracker/commits/message_builder.py

@@ -19,21 +19,30 @@ _SUMMARY_LABELS = (
 
 
 def _format_ts(moment: dt.datetime | None) -> str:
+    """Render an aware datetime in local time with an explicit offset.
+
+    Local wall-clock time plus the UTC offset, e.g. 2026-09-12 08:00:00+02:00
+    (matching the log timestamp style in logging/setup.py, which also uses
+    local time rather than UTC).
+    """
     if moment is None:
         return ""
-    return moment.strftime("%Y-%m-%d %H:%M:%S%z")
+    return moment.astimezone().isoformat(sep=" ", timespec="seconds")
 
 
 def _author_lines(record) -> list[str]:  # noqa: ANN001 - ChangeRecord, avoid cycle
     lines: list[str] = []
     author = record.author
-    if author is not None:
-        lines.append(f"    Last modified by: {author.identifier}")
-        ts = _format_ts(author.timestamp)
-        if ts:
-            lines.append(f"    Modified at: {ts}")
-    else:
-        lines.append("    Last modified by: UNKNOWN")
+    identifier = author.identifier if author is not None else "UNKNOWN"
+    lines.append(f"    Last modified by: {identifier}")
+    # Filesystem last-modified time (Section 12: file_timestamp); rendered
+    # in local time like the log timestamps. Resolver-provided timestamps
+    # (author.timestamp) stay authoritative and are shown as well.
+    file_ts = _format_ts(record.file_timestamp)
+    if file_ts:
+        lines.append(f"    Modified at: {file_ts}")
+    if author is not None and author.timestamp is not None:
+        lines.append(f"    Changed at: {_format_ts(author.timestamp)}")
     return lines
 
 

tests/integration/test_run_cycle.py

@@ -102,6 +102,22 @@ class TestRunCycle:
         body = _git_out("log", "-1", "--format=%b", cwd=git_repo)
         assert "Last modified by: DOMAIN\\jsmith" in body
 
+    def test_file_mtime_appears_in_commit_local_time(
+        self, git_repo: Path, tracker_config: dict, tmp_path: Path
+    ) -> None:
+        """Section 12 file_timestamp rendered as 'Modified at' (local time)."""
+        import re as re_mod
+
+        (git_repo / "config.xml").write_text("<c/>", encoding="utf-8")
+        _run(tracker_config, tmp_path)
+        body = _git_out("log", "-1", "--format=%b", cwd=git_repo)
+        # Local-time format with explicit +/-HH:MM offset (Section 15)
+        assert re_mod.search(
+            r"Modified at: \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}[+-]\d{2}:\d{2}\b", body
+        )
+        # The timestamp block sits directly under the changed file entry
+        assert "  config.xml\n    Last modified by: UNKNOWN\n    Modified at:" in body
+
     def test_excluded_files_not_committed(
         self, git_repo: Path, tracker_config: dict, tmp_path: Path
     ) -> None:

tests/unit/test_lock_config_message.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import datetime as dt
+import re
 from pathlib import Path
 
 import pytest
@@ -152,6 +153,7 @@ class TestCommitMessage:
                 ChangeRecord(
                     path="Stations/PS101/project.xml",
                     change_type=ChangeType.MODIFIED,
+                    file_timestamp=dt.datetime(2026, 9, 11, 6, 42, 9, tzinfo=dt.UTC),
                     author=AuthorIdentity(
                         identifier="DOMAIN\\jsmith",
                         source="scada_audit_log",
@@ -175,6 +177,13 @@ class TestCommitMessage:
         assert "Added: 1" in message
         assert "Last modified by: DOMAIN\\jsmith" in message
         assert "Last modified by: UNKNOWN" in message
+        # Filesystem mtime rendered as 'Modified at' in local time with offset
+        assert "    Modified at: " in message
+        assert re.search(
+            r"Modified at: \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}[+-]\d{2}:\d{2}\b", message
+        )
+        # Resolver-provided timestamp kept as a separate 'Changed at' line
+        assert "    Changed at: " in message
         assert "Stations/PS027/old.xml" in message
         # Trailers last (Section 36)
         assert "Tracker-Version: 1.0.0" in message