add fdiff.utils module

Author: chrissimpkins

lib/fdiff/utils.py

@@ -0,0 +1,17 @@
+import os
+
+from datetime import datetime, timezone
+
+
+def get_file_modtime(path):
+    """Returns ISO formatted file modification time in local system timezone"""
+    return (
+        datetime.fromtimestamp(os.stat(path).st_mtime, timezone.utc)
+        .astimezone()
+        .isoformat()
+    )
+
+
+def file_exists(path):
+    """Validates file path as existing local file"""
+    return os.path.isfile(path)