fix: timestamp handling on Android

cli/Cargo.lock

@@ -1920,6 +1920,7 @@ dependencies = [
  "sha2 0.11.0",
  "socket2 0.6.5",
  "thiserror 2.0.19",
+ "time",
  "tokio",
  "tokio-rustls",
  "tokio-stream",

packages/core/Cargo.lock

@@ -1403,6 +1403,7 @@ dependencies = [
  "sha2 0.11.0",
  "socket2 0.6.5",
  "thiserror 2.0.19",
+ "time",
  "tokio",
  "tokio-rustls",
  "tokio-stream",

packages/core/Cargo.toml

@@ -28,6 +28,7 @@ serde_json = "1.0.151"
 sha2 = { version = "0.11.0", optional = true }
 socket2 = { version = "0.6.5", optional = true }
 thiserror = "2.0.19"
+time = { version = "0.3.54", features = ["parsing"], optional = true }
 tokio = { version = "1.53.1", features = ["full"] }
 tokio-rustls = { version = "0.26.4", default-features = false, features = ["ring", "tls12"], optional = true }
 tokio-stream = "0.1.19"
@@ -44,7 +45,7 @@ x509-parser = { version = "0.18.1", features = ["verify"], optional = true }
 default = []
 crypto = ["ed25519-dalek", "rcgen", "rsa", "sha2", "tokio-util"]
 discovery = ["http", "multicast"]
-http = ["crypto", "form_urlencoded", "http-body-util", "hyper", "hyper-util", "if-addrs", "pem", "percent-encoding", "reqwest", "rustls", "socket2", "tokio-rustls", "tokio-util", "x509-parser"]
+http = ["crypto", "form_urlencoded", "http-body-util", "hyper", "hyper-util", "if-addrs", "pem", "percent-encoding", "reqwest", "rustls", "socket2", "time", "tokio-rustls", "tokio-util", "x509-parser"]
 multicast = ["if-addrs", "socket2", "tokio-util"]
 webrtc-signaling = ["tokio-tungstenite"]
 webrtc = ["crypto", "flate2", "dep:webrtc", "webrtc-signaling", "x509-parser"]

packages/core/src/http/server/common/save.rs

@@ -34,6 +34,9 @@ pub enum FileUploadTarget {
 
     /// The server writes the file to this path (created or truncated)
     /// and reports the result on `result_tx`.
+    ///
+    /// Timestamps provided in the sender's file metadata are applied to the
+    /// written file, so the application does not need to set them itself.
     Path {
         /// The path to write the file to.
         path: PathBuf,
@@ -49,6 +52,9 @@ pub enum FileUploadTarget {
 
     /// The server writes the file to this raw file descriptor (Android only)
     /// and reports the result on `result_tx`.
+    ///
+    /// Timestamps provided in the sender's file metadata are applied through
+    /// the descriptor, which also covers SAF documents that have no path.
     #[cfg(target_os = "android")]
     Fd {
         /// The raw file descriptor to write the file to.
@@ -65,6 +71,20 @@ pub enum FileUploadTarget {
     },
 }
 
+/// The sender-provided timestamps of an uploaded file, applied to the written
+/// file for [FileUploadTarget::Path] and [FileUploadTarget::Fd].
+#[derive(Debug, Clone, Copy, Default)]
+pub(crate) struct FileTimestamps {
+    pub modified: Option<std::time::SystemTime>,
+    pub accessed: Option<std::time::SystemTime>,
+}
+
+impl FileTimestamps {
+    fn is_empty(&self) -> bool {
+        self.modified.is_none() && self.accessed.is_none()
+    }
+}
+
 /// Outcome of receiving an uploaded file.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum SaveResult {
@@ -84,6 +104,7 @@ pub(crate) async fn save_req_to_target(
     target: FileUploadTarget,
     file_size: u64,
     expected_sha256: Option<&str>,
+    timestamps: FileTimestamps,
 ) -> SaveResult {
     use sha2::{Digest, Sha256};
 
@@ -109,6 +130,7 @@ pub(crate) async fn save_req_to_target(
                 },
                 file_size,
                 progress_tx,
+                timestamps,
             );
             (binary_tx, result_rx, Some(result_tx))
         }
@@ -129,6 +151,7 @@ pub(crate) async fn save_req_to_target(
                 },
                 file_size,
                 progress_tx,
+                timestamps,
             );
             (binary_tx, result_rx, Some(result_tx))
         }
@@ -226,13 +249,15 @@ fn spawn_file_writer(
     open: impl Future<Output = Result<tokio::fs::File, String>> + Send + 'static,
     expected_size: u64,
     progress_tx: Option<mpsc::Sender<u64>>,
+    timestamps: FileTimestamps,
 ) -> (mpsc::Sender<Bytes>, oneshot::Receiver<Result<(), String>>) {
     let (binary_tx, mut binary_rx) = mpsc::channel::<Bytes>(UPLOAD_CHANNEL_CAPACITY);
     let (internal_tx, internal_rx) = oneshot::channel::<Result<(), String>>();
 
     tokio::spawn(async move {
         let result =
-            write_file_from_receiver(open, expected_size, &mut binary_rx, progress_tx).await;
+            write_file_from_receiver(open, expected_size, &mut binary_rx, progress_tx, timestamps)
+                .await;
         // Unblock the request handler if it is still sending chunks.
         binary_rx.close();
         let _ = internal_tx.send(result);
@@ -248,11 +273,16 @@ fn spawn_file_writer(
 ///
 /// The file is truncated to the written size, so that a target that pointed at
 /// a longer, pre-existing file cannot keep a tail of the old content.
+///
+/// The sender-provided `timestamps` are applied to the completely written
+/// file. This happens on the still-open handle: an Android file descriptor has
+/// no path to address the file by afterwards.
 async fn write_file_from_receiver(
     open: impl Future<Output = Result<tokio::fs::File, String>>,
     expected_size: u64,
     rx: &mut mpsc::Receiver<Bytes>,
     progress_tx: Option<mpsc::Sender<u64>>,
+    timestamps: FileTimestamps,
 ) -> Result<(), String> {
     use tokio::io::AsyncWriteExt;
 
@@ -295,5 +325,26 @@ async fn write_file_from_receiver(
         tracing::warn!("Could not truncate file to {written} bytes: {e}");
     }
 
+    // The timestamps are applied last because the writes and the truncation
+    // above update the modification time themselves.
+    //
+    // Best-effort: the provider backing an Android file descriptor may not
+    // support changing timestamps, which must not fail the completed transfer.
+    if !timestamps.is_empty() {
+        let mut times = std::fs::FileTimes::new();
+        if let Some(modified) = timestamps.modified {
+            times = times.set_modified(modified);
+        }
+        if let Some(accessed) = timestamps.accessed {
+            times = times.set_accessed(accessed);
+        }
+        let file = file.into_std().await;
+        // Also closes the file, off the async runtime like tokio::fs does.
+        let result = tokio::task::spawn_blocking(move || file.set_times(times)).await;
+        if let Ok(Err(e)) = result {
+            tracing::warn!("Could not set file timestamps: {e}");
+        }
+    }
+
     Ok(())
 }

packages/core/src/http/server/v2.rs

@@ -7,7 +7,7 @@ use crate::http::server::common::error::AppError;
 use crate::http::server::common::pin::check_pin;
 use crate::http::server::common::query::parse_query;
 use crate::http::server::common::response::{empty_body, BoxedBody, JsonResponse};
-use crate::http::server::common::save::{FileUploadTarget, SaveResult};
+use crate::http::server::common::save::{FileTimestamps, FileUploadTarget, SaveResult};
 use crate::http::server::common::session::{
     FileStatusV2, PendingSessionV2, SessionFileV2, SessionStateV2, UploadSessionV2,
 };
@@ -385,6 +385,13 @@ pub(crate) async fn upload(
 
     let file_size = file_dto.size;
     let expected_sha256 = file_dto.sha256.clone();
+    let timestamps = match &file_dto.metadata {
+        Some(metadata) => FileTimestamps {
+            modified: metadata.modified_time(),
+            accessed: metadata.accessed_time(),
+        },
+        None => FileTimestamps::default(),
+    };
     let (target_tx, target_rx) = oneshot::channel::<FileUploadTarget>();
 
     let event = ServerEventV2::FileUpload {
@@ -403,8 +410,14 @@ pub(crate) async fn upload(
         return Err(AppError::Status(StatusCode::INTERNAL_SERVER_ERROR));
     };
 
-    let result =
-        common::save::save_req_to_target(req, target, file_size, expected_sha256.as_deref()).await;
+    let result = common::save::save_req_to_target(
+        req,
+        target,
+        file_size,
+        expected_sha256.as_deref(),
+        timestamps,
+    )
+    .await;
 
     upload_guard.finish(result).await;
 

packages/core/src/model/transfer.rs

@@ -115,3 +115,86 @@ pub struct FileMetadata {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub accessed: Option<String>,
 }
+
+#[cfg(feature = "http")]
+impl FileMetadata {
+    /// The `modified` timestamp parsed as a [`std::time::SystemTime`],
+    /// or `None` when absent or not parsable.
+    pub fn modified_time(&self) -> Option<std::time::SystemTime> {
+        parse_timestamp(self.modified.as_deref()?)
+    }
+
+    /// The `accessed` timestamp parsed as a [`std::time::SystemTime`],
+    /// or `None` when absent or not parsable.
+    pub fn accessed_time(&self) -> Option<std::time::SystemTime> {
+        parse_timestamp(self.accessed.as_deref()?)
+    }
+}
+
+/// Parses an RFC 3339 timestamp (e.g. `2026-08-01T10:20:30.456Z`), the format
+/// the protocol uses for file metadata.
+#[cfg(feature = "http")]
+fn parse_timestamp(value: &str) -> Option<std::time::SystemTime> {
+    match time::OffsetDateTime::parse(value, &time::format_description::well_known::Rfc3339) {
+        Ok(parsed) => Some(parsed.into()),
+        Err(e) => {
+            tracing::warn!("Could not parse file timestamp {value:?}: {e}");
+            None
+        }
+    }
+}
+
+#[cfg(all(test, feature = "http"))]
+mod tests {
+    use super::*;
+    use std::time::{Duration, SystemTime};
+
+    fn metadata(modified: &str) -> FileMetadata {
+        FileMetadata {
+            modified: Some(modified.to_string()),
+            accessed: None,
+        }
+    }
+
+    #[test]
+    fn parses_utc_timestamp() {
+        assert_eq!(
+            metadata("2000-01-01T00:00:00Z").modified_time(),
+            Some(SystemTime::UNIX_EPOCH + Duration::from_secs(946_684_800)),
+        );
+    }
+
+    #[test]
+    fn parses_fractional_seconds() {
+        // The Dart implementation sends `DateTime.toIso8601String()` of a UTC
+        // value, which includes fractional seconds: 1970-01-01T00:00:00.500Z.
+        assert_eq!(
+            metadata("1970-01-01T00:00:00.500Z").modified_time(),
+            Some(SystemTime::UNIX_EPOCH + Duration::from_millis(500)),
+        );
+    }
+
+    #[test]
+    fn parses_offset_timestamp() {
+        assert_eq!(
+            metadata("2000-01-01T01:00:00+01:00").modified_time(),
+            Some(SystemTime::UNIX_EPOCH + Duration::from_secs(946_684_800)),
+        );
+    }
+
+    #[test]
+    fn ignores_invalid_timestamp() {
+        assert_eq!(metadata("yesterday").modified_time(), None);
+        assert_eq!(metadata("2000-01-01T00:00:00").modified_time(), None);
+    }
+
+    #[test]
+    fn ignores_absent_timestamp() {
+        let metadata = FileMetadata {
+            modified: None,
+            accessed: None,
+        };
+        assert_eq!(metadata.modified_time(), None);
+        assert_eq!(metadata.accessed_time(), None);
+    }
+}

packages/core/tests/v2_server.rs

@@ -10,7 +10,7 @@ use localsend::http::server::common::save::FileUploadTarget;
 use localsend::http::server::v2::{PrepareUploadDecisionV2, ServerEventV2, SessionEndReasonV2};
 use localsend::http::server::{start_with_port, ServerConfigV2};
 use localsend::http::state::ClientInfo;
-use localsend::model::transfer::FileDto;
+use localsend::model::transfer::{FileDto, FileMetadata};
 use std::collections::HashMap;
 use std::path::PathBuf;
 use std::sync::atomic::{AtomicU16, AtomicU64, Ordering};
@@ -370,6 +370,61 @@ async fn test_full_upload_flow() {
     assert_status(result, 403);
 }
 
+/// The sender-provided metadata timestamps are applied to the written file.
+#[tokio::test]
+async fn test_upload_applies_file_timestamps() {
+    let save_dir = std::env::temp_dir().join(format!("localsend-test-{}", uuid::Uuid::new_v4()));
+    tokio::fs::create_dir_all(&save_dir).await.unwrap();
+
+    let server = start_test_server(None, true, Some(save_dir.clone())).await;
+    let client = LsHttpClientV2::try_new_without_cert().unwrap();
+
+    let bytes = b"hello".to_vec();
+    let mut file = file_dto("file-a", "a.bin", bytes.len() as u64);
+    file.metadata = Some(FileMetadata {
+        modified: Some("2020-08-15T10:20:30.500Z".to_string()),
+        accessed: None,
+    });
+
+    let response = client
+        .prepare_upload(
+            ProtocolType::Http,
+            "127.0.0.1",
+            server.port,
+            None,
+            prepare_upload_request(&[file]),
+            None,
+            CancellationToken::new(),
+        )
+        .await
+        .unwrap()
+        .response
+        .unwrap();
+
+    upload_bytes(
+        &client,
+        server.port,
+        &response.session_id,
+        "file-a",
+        &response.files["file-a"],
+        &bytes,
+    )
+    .await
+    .unwrap();
+
+    let modified = tokio::fs::metadata(save_dir.join("file-a"))
+        .await
+        .unwrap()
+        .modified()
+        .unwrap();
+    assert_eq!(
+        modified,
+        std::time::SystemTime::UNIX_EPOCH + Duration::from_millis(1_597_486_830_500),
+    );
+
+    tokio::fs::remove_dir_all(&save_dir).await.unwrap();
+}
+
 #[tokio::test]
 async fn test_upload_with_matching_sha256() {
     let server = start_test_server(None, true, None).await;

packages/localsend_isolates/lib/rust/api/server.dart

@@ -91,6 +91,9 @@ abstract class RsHttpServer implements RustOpaqueInterface {
   ///
   /// The progress (fraction of [file_size]) is emitted on [sink]
   /// while the file is being received.
+  ///
+  /// Timestamps provided in the sender's file metadata are applied to the
+  /// written file by the server.
   Stream<double> respondFileUpload({required String sessionId, required String fileId, String? path, int? fileDescriptor, required BigInt fileSize});
 
   /// Answers the pending [RsServerEvent::WebPrepareDownload] event.

packages/localsend_isolates/lib/rust/frb_generated.dart

@@ -6117,6 +6117,9 @@ class RsHttpServerImpl extends RustOpaque implements RsHttpServer {
   ///
   /// The progress (fraction of [file_size]) is emitted on [sink]
   /// while the file is being received.
+  ///
+  /// Timestamps provided in the sender's file metadata are applied to the
+  /// written file by the server.
   Stream<double> respondFileUpload({
     required String sessionId,
     required String fileId,

packages/localsend_isolates/lib/src/isolate/child/server_isolate.dart

@@ -683,12 +683,6 @@ Future<void> _handleFileUpload({
   }
 
   try {
-    await applyFileTimestamps(
-      target: target,
-      lastModified: dartFile.metadata?.lastModified,
-      lastAccessed: dartFile.metadata?.lastAccessed,
-    );
-
     String? filePath;
     bool savedToGallery = false;
     if (shouldSaveToGallery) {

packages/localsend_isolates/lib/src/task/server/file_saver.dart

@@ -115,29 +115,6 @@ Future<FileSaveTarget> reopenFileSaveTarget(FileSaveTarget target) async {
   );
 }
 
-/// Applies the file timestamps after the file has been written to a plain path.
-Future<void> applyFileTimestamps({
-  required FileSaveTarget target,
-  DateTime? lastModified,
-  DateTime? lastAccessed,
-}) async {
-  final path = target.path;
-  if (path == null) {
-    return;
-  }
-  final file = File(path);
-  if (lastModified != null) {
-    try {
-      await file.setLastModified(lastModified);
-    } catch (_) {}
-  }
-  if (lastAccessed != null) {
-    try {
-      await file.setLastAccessed(lastAccessed);
-    } catch (_) {}
-  }
-}
-
 /// Moves a file that has been written to the cache directory into the
 /// OS gallery (Photos/Videos).
 ///

packages/localsend_isolates/lib/src/task/server/http_server.dart

@@ -57,6 +57,9 @@ class HttpServerService {
   /// The returned stream emits the progress (fraction of [fileSize]) while the
   /// file is being received and closes once the file has been received
   /// completely (or errors when saving failed).
+  ///
+  /// Timestamps provided in the sender's file metadata are applied to the
+  /// written file by the Rust server.
   Stream<double> respondFileUpload({
     required String sessionId,
     required String fileId,

packages/localsend_isolates/pubspec.lock

@@ -640,10 +640,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "949a932224383300f01be9221c39180316445ecb8e7547f70a41a35bf421fb9e"
+      sha256: "8161c84903fd860b26bfdefb7963b3f0b68fee7adea0f59ef805ecca346f0c7a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.11"
+    version: "0.7.10"
   type_plus:
     dependency: transitive
     description:

packages/localsend_isolates/rust/Cargo.lock

@@ -1594,6 +1594,7 @@ dependencies = [
  "sha2 0.11.0",
  "socket2 0.6.5",
  "thiserror 2.0.19",
+ "time",
  "tokio",
  "tokio-rustls",
  "tokio-stream",

packages/localsend_isolates/rust/src/api/server.rs

@@ -388,6 +388,9 @@ impl RsHttpServer {
     ///
     /// The progress (fraction of [file_size]) is emitted on [sink]
     /// while the file is being received.
+    ///
+    /// Timestamps provided in the sender's file metadata are applied to the
+    /// written file by the server.
     pub async fn respond_file_upload(
         &self,
         sink: StreamSink<f64>,