align with unix conventions

src/databricks/labs/blueprint/paths.py

@@ -695,8 +695,8 @@ def _file_info(self) -> FileInfo:
 
     def stat(self, *, follow_symlinks=True) -> os.stat_result:
         seq: list[float] = [-1] * 10
-        seq[stat.ST_SIZE] = self._file_info.file_size or -1  # 6
-        seq[stat.ST_MTIME] = self._file_info.modification_time or -1  # 8
+        seq[stat.ST_SIZE] = float(self._file_info.file_size) / 1000.0 or -1  # 6
+        seq[stat.ST_MTIME] = float(self._file_info.modification_time) / 1000.0 or -1  # 8
         return os.stat_result(seq)
 
     def is_dir(self) -> bool:
@@ -852,8 +852,8 @@ def _object_info(self) -> ObjectInfo:
     def stat(self, *, follow_symlinks=True) -> os.stat_result:
         seq: list[float] = [-1] * 10
         seq[stat.ST_SIZE] = self._object_info.size or -1  # 6
-        seq[stat.ST_MTIME] = self._object_info.modified_at or -1  # 8
-        seq[stat.ST_CTIME] = self._object_info.created_at or -1  # 9
+        seq[stat.ST_MTIME] = float(self._object_info.modified_at) / 1000.0  or -1  # 8
+        seq[stat.ST_CTIME] = float(self._object_info.created_at) / 1000.0  or -1  # 9
         return os.stat_result(seq)
 
     def is_dir(self) -> bool:

tests/integration/test_paths.py

@@ -1,4 +1,5 @@
 import codecs
+from datetime import datetime
 from pathlib import Path
 
 import pytest
@@ -67,6 +68,21 @@ def test_open_text_io(ws, make_random, cls):
     assert not hello_txt.exists()
 
 
+@pytest.mark.parametrize("cls", DATABRICKS_PATHLIKE)
+def test_stat(ws, make_random, cls):
+    now = datetime.now().timestamp()
+    name = make_random()
+    wsp = cls(ws, f"~/{name}/a/b/c")
+    with_user = wsp.expanduser()
+    with_user.mkdir(parents=True)
+
+    hello_txt = with_user / "hello.txt"
+    hello_txt.write_text("Hello, World!")
+    if cls is WorkspacePath: # DBFSPath has no st_ctime
+        assert hello_txt.stat().st_ctime >= now
+    assert hello_txt.stat().st_mtime >= now
+
+
 @pytest.mark.parametrize("cls", DATABRICKS_PATHLIKE)
 def test_unlink(ws, make_random, cls):
     name = make_random()