use mtime

src/main.rs

@@ -110,7 +110,7 @@ fn process_camera_pics() -> anyhow::Result<()> {
         let mut pic = Pic {
             crop,
             thumb: [0u8; THUMB_H * THUMB_W],
-            timestamp: meta.ctime(),
+            timestamp: meta.mtime(),
             filename: dir_entry.path().file_name().unwrap_or_default()
                 .to_string_lossy().to_string(),
         };