feat(dates): calendar-day date filters in the owner's display zone (#152)

/photos, /photos/exif and unified search take date_from_day /
date_to_day (YYYY-MM-DD): the server turns them into the first day's
start and the last day's end in the owner's display zone, the same days
/memories groups by. Each replaces its instant counterpart. Clients stop
computing midnights in the device's zone, which drifted by the travel
offset whenever the phone's zone differed from display_tz.

e2e check: every fixture is included by its display-zone day and
excluded by the days either side.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/data/mod.rs

@@ -153,9 +153,13 @@ pub struct FilesRequest {
 
     // Date range filtering: inclusive true instants (unix seconds), compared
     // against each row's true instant (ADR-0001, #152). For calendar days,
-    // send the day's bounds in the owner's display zone.
+    // send `date_from_day` / `date_to_day` (`YYYY-MM-DD`) instead: the server
+    // takes their bounds in the owner's display zone, and each replaces its
+    // instant counterpart.
     pub date_from: Option<i64>,
     pub date_to: Option<i64>,
+    pub date_from_day: Option<String>,
+    pub date_to_day: Option<String>,
 
     // Media type filtering
     pub media_type: Option<MediaType>,
@@ -538,6 +542,10 @@ pub struct ExifBatchRequest {
     pub date_from: Option<i64>,
     /// Upper bound (inclusive). Same semantics as `date_to` on `/photos`.
     pub date_to: Option<i64>,
+    /// Calendar-day bounds (`YYYY-MM-DD`) in the owner's display zone; each
+    /// replaces its instant counterpart. Same as on `/photos`.
+    pub date_from_day: Option<String>,
+    pub date_to_day: Option<String>,
     /// Restrict results to a single library by id. Omit (or "" / "all") for
     /// union mode — the default. Filtered post-query in the handler so the
     /// existing `query_by_exif` DAO trait stays untouched.

src/date_view.rs

@@ -121,13 +121,39 @@ pub fn day_start_instant(day: NaiveDate, zone: Tz) -> i64 {
 /// exact call in Rust without a row being dropped first.
 pub const LEGACY_INSTANT_BAND_SECS: i64 = 15 * 3600;
 
+/// Fold calendar-day filter params (`date_from_day` / `date_to_day`,
+/// `YYYY-MM-DD`) into the instant bounds: the first day's start and the
+/// last day's end in the owner's display zone, the same days `/memories`
+/// groups by (#152). A day param replaces its instant counterpart; an
+/// unparseable one is ignored. `zone` is only called when a day is given,
+/// so requests without them never read prefs.
+pub fn apply_day_bounds(
+    from: &mut Option<i64>,
+    to: &mut Option<i64>,
+    from_day: Option<&str>,
+    to_day: Option<&str>,
+    zone: impl FnOnce() -> Tz,
+) {
+    if from_day.is_none() && to_day.is_none() {
+        return;
+    }
+    let zone = zone();
+    let parse = |d: &str| NaiveDate::parse_from_str(d.trim(), "%Y-%m-%d").ok();
+    if let Some(day) = from_day.and_then(parse) {
+        *from = Some(day_start_instant(day, zone));
+    }
+    if let Some(next) = to_day.and_then(parse).and_then(|d| d.succ_opt()) {
+        *to = Some(day_start_instant(next, zone) - 1);
+    }
+}
+
 /// An inclusive true-instant range (`date_from` / `date_to` on the photo
 /// listing endpoints), plus the zones [`row_true_instant`] needs to read
 /// unconverted rows. Either bound may be open.
 ///
 /// Bounds are instants, never wall clocks: a client filtering by calendar
-/// day sends that day's midnights in the owner's display zone (see
-/// `nl_query::iso_to_unix`), so the range agrees with
+/// day sends `date_from_day` / `date_to_day` and the handler turns them into
+/// display-zone day bounds ([`apply_day_bounds`]), so the range agrees with
 /// [`row_display_day`] grouping by construction.
 #[derive(Clone, Copy, Debug)]
 pub struct InstantRange {
@@ -698,6 +724,52 @@ mod tests {
         );
     }
 
+    #[test]
+    fn day_bounds_are_the_display_zone_day() {
+        // July 5 is a different stretch of instants for a NY and a Tokyo
+        // owner; the device's zone plays no part (#152).
+        let (mut from, mut to) = (None, None);
+        apply_day_bounds(
+            &mut from,
+            &mut to,
+            Some("2024-07-05"),
+            Some("2024-07-05"),
+            ny,
+        );
+        assert_eq!((from, to), (Some(1_720_152_000), Some(1_720_238_399)));
+        let (mut from, mut to) = (None, None);
+        apply_day_bounds(
+            &mut from,
+            &mut to,
+            Some("2024-07-05"),
+            Some("2024-07-05"),
+            || Tz::Asia__Tokyo,
+        );
+        assert_eq!((from, to), (Some(1_720_105_200), Some(1_720_191_599)));
+        // A 23-hour DST day still ends at the next midnight.
+        let (mut from, mut to) = (None, None);
+        apply_day_bounds(
+            &mut from,
+            &mut to,
+            Some("2024-03-10"),
+            Some("2024-03-10"),
+            ny,
+        );
+        assert_eq!((from, to), (Some(1_710_046_800), Some(1_710_129_599)));
+    }
+
+    #[test]
+    fn day_bounds_replace_their_side_only_and_skip_bad_input() {
+        let (mut from, mut to) = (Some(1), Some(2));
+        apply_day_bounds(&mut from, &mut to, None, Some("2024-07-05"), ny);
+        assert_eq!((from, to), (Some(1), Some(1_720_238_399)));
+        let (mut from, mut to) = (Some(1), Some(2));
+        apply_day_bounds(&mut from, &mut to, Some("July 5th"), None, ny);
+        assert_eq!((from, to), (Some(1), Some(2)));
+        // No day params: the zone (a prefs read) is never asked for.
+        apply_day_bounds(&mut from, &mut to, None, None, || panic!("zone read"));
+    }
+
     #[test]
     fn display_day_respects_a_non_new_york_display_zone() {
         // Owner in Tokyo: 2024-07-05 01:30 UTC = 10:30 JST July 5 (not

src/files.rs

@@ -199,6 +199,14 @@ pub async fn list_photos<TagD: TagDao, FS: FileSystemAccess>(
     tag_dao: Data<Mutex<TagD>>,
     exif_dao: Data<Mutex<Box<dyn ExifDao>>>,
 ) -> HttpResponse {
+    let mut req = req.into_inner();
+    crate::date_view::apply_day_bounds(
+        &mut req.date_from,
+        &mut req.date_to,
+        req.date_from_day.as_deref(),
+        req.date_to_day.as_deref(),
+        || crate::date_view::owner_display_zone(&app_state.user_ai_prefs_dao),
+    );
     let search_path = &req.path;
 
     let span = tracing::Span::current();
@@ -1176,7 +1184,8 @@ pub async fn get_gps_summary(
 /// Handler for the batch EXIF endpoint at `GET /photos/exif`.
 ///
 /// Returns a single-row projection of `image_exif` for every photo whose
-/// `date_taken` falls in `[date_from, date_to]`, across all libraries.
+/// true instant falls in `[date_from, date_to]` (or the display-zone
+/// `date_from_day` / `date_to_day`), across all libraries.
 /// Designed to replace the N+1 pattern of `/photos` + per-file
 /// `/image/metadata` for window-scoped consumers like Apollo's photo-to-
 /// track matcher: one DB query, one HTTP round-trip, one mutex acquisition.
@@ -1194,6 +1203,14 @@ pub async fn list_exif_summary(
     app_state: Data<AppState>,
 ) -> Result<HttpResponse, actix_web::Error> {
     let span = tracing::Span::current();
+    let mut req = req.into_inner();
+    crate::date_view::apply_day_bounds(
+        &mut req.date_from,
+        &mut req.date_to,
+        req.date_from_day.as_deref(),
+        req.date_to_day.as_deref(),
+        || crate::date_view::owner_display_zone(&app_state.user_ai_prefs_dao),
+    );
 
     span.set_attribute(
         "date_from",

src/unified_search.rs

@@ -77,6 +77,10 @@ pub struct UnifiedQuery {
     pub media_type: Option<MediaType>,
     pub date_from: Option<i64>,
     pub date_to: Option<i64>,
+    /// Calendar days (`YYYY-MM-DD`) in the owner's display zone; each
+    /// replaces its instant counterpart (see `date_view::apply_day_bounds`).
+    pub date_from_day: Option<String>,
+    pub date_to_day: Option<String>,
     pub camera_make: Option<String>,
     pub camera_model: Option<String>,
     pub gps_lat: Option<f64>,
@@ -292,6 +296,14 @@ pub async fn unified_search<TagD: TagDao>(
     tag_dao: Data<Mutex<TagD>>,
     query: Query<UnifiedQuery>,
 ) -> HttpResponse {
+    let mut query = query.into_inner();
+    crate::date_view::apply_day_bounds(
+        &mut query.date_from,
+        &mut query.date_to,
+        query.date_from_day.as_deref(),
+        query.date_to_day.as_deref(),
+        || crate::date_view::owner_display_zone(&state.user_ai_prefs_dao),
+    );
     let nl = query.q.trim().to_string();
     if nl.is_empty() {
         return bad_request("query parameter `q` is required");