Change the sort order

src/stills/main.py

@@ -29,12 +29,26 @@ def parse_args():
 	parser.add_argument('--thumb-height', type=int, help='Thumbnail height in pixels')
 	return parser.parse_args()
 
+def get_image_date(path: Path):
+	try:
+		with Image.open(path) as img:
+			exif = img._getexif()
+			if exif:
+				date_str = exif.get(36867) or exif.get(306)  # DateTimeOriginal or DateTime
+				if date_str:
+					from datetime import datetime
+					return datetime.strptime(date_str, '%Y:%m:%d %H:%M:%S')
+	except Exception:
+		pass
+	return None
+
 def collect_images(source_dir: Path):
 	images = []
-	for entry in sorted(source_dir.iterdir()):
+	for entry in reversed(sorted(source_dir.iterdir())):
 		if entry.is_file() and entry.suffix.lower() in IMAGE_EXTENSIONS:
 			images.append(entry)
-	return images
+	return sorted(images,
+			key=lambda img: get_image_date(img) or Path(img).stat().st_mtime)
 
 def extract_metadata(image_path: Path):
 	try: