fix: remove ceiling of change timestamps

ddir/diff.py

@@ -8,10 +8,9 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from datetime import date
+from datetime import date, datetime
 from enum import Enum
 from hashlib import md5
-from math import ceil
 from os import sep, listdir, mkdir, stat
 from os.path import exists, isfile, isdir
 from random import randint as rand
@@ -259,21 +258,17 @@ def _create_for_file(diff: DiffFileCreator, source: str, target: str, fast: bool
         print(f'file not in target: {source} {target}')
         diff.add_diff(Diff(DiffType.POSITIVE, 'f', source, target))
     else:
-        # It may occur that the source modification time has a higher/lower
-        # precision than the target modification time. As rounding to e.g. 2
-        # decimal places may lead to a difference of .01, we round to the
-        # ceiling to avoid false positives.
-        source_last_changed = ceil(stat(source).st_mtime)
-        target_last_changed = ceil(stat(target).st_mtime)
-
-        # Here, we check if the files are different by more than one second.
-        # This is because on some file systems, the modification time may be
-        # different by one second, even if the file has not been changed.
-        if source_last_changed - target_last_changed > 1:
-            print(f'files differ: {source} is newer than {target}')
+        source_last_changed = stat(source).st_mtime
+        target_last_changed = stat(target).st_mtime
+
+        source_last_changed_str = datetime.fromtimestamp(source_last_changed).isoformat()
+        target_last_changed_str = datetime.fromtimestamp(target_last_changed).isoformat()
+
+        if source_last_changed > target_last_changed:
+            print(f'[metadata] files differ: {source} is newer than {target} ({source_last_changed_str} > {target_last_changed_str})')
             diff.add_diff(Diff(DiffType.NEWER, 'f', source, target))
-        elif target_last_changed - source_last_changed > 1:
-            print(f'files differ: {target} is newer than {source}')
+        elif target_last_changed > source_last_changed:
+            print(f'[metadata] files differ: {target} is newer than {source} ({target_last_changed_str} > {source_last_changed_str})')
             diff.add_diff(Diff(DiffType.OLDER, 'f', source, target))
         elif not fast:
             with open(source, 'rb', encoding=ENCODING) as source_file, \
@@ -282,7 +277,7 @@ def _create_for_file(diff: DiffFileCreator, source: str, target: str, fast: bool
                 target_md5 = md5(target_file.read()).hexdigest()
 
                 if source_md5 != target_md5:
-                    print(f'files differ: {source} (change dates are equal)')
+                    print(f'[content ] files differ: {source}')
                     diff.add_diff(Diff(DiffType.UNKNOWN, 'f', source, target))