src/memories.rs

@@ -1,7 +1,6 @@
 use actix_web::web::Data;
 use actix_web::{HttpRequest, HttpResponse, Responder, get, web};
-use chrono::LocalResult::{Ambiguous, Single};
-use chrono::{DateTime, FixedOffset, Local, LocalResult, NaiveDate, TimeZone};
+use chrono::{DateTime, FixedOffset, Local, NaiveDate, TimeZone, Utc};
 use log::{debug, trace, warn};
 use opentelemetry::KeyValue;
 use opentelemetry::trace::{Span, Status, TraceContextExt, Tracer};
@@ -134,6 +133,15 @@ pub struct MemoriesResponse {
 }
 
 pub fn extract_date_from_filename(filename: &str) -> Option<DateTime<FixedOffset>> {
+    // Filenames carry only digits — no timezone. We deliberately interpret
+    // them as UTC so `.timestamp()` returns the wall-clock-as-UTC unix
+    // seconds, matching the "naive local reinterpreted as UTC" convention
+    // image_exif.date_taken uses for kamadak-exif DateTimeOriginal (which
+    // is also naive). Anything else (Local::from_local_datetime, the
+    // previous behavior) shifted filename-sourced dates by the SERVER's
+    // TZ offset relative to UTC, making them disagree with EXIF-sourced
+    // dates by hours and double-shifting through Apollo's photo matcher
+    // (which re-anchors naive-as-UTC via the browser TZ).
     let build_date_from_ymd_capture =
         |captures: &regex::Captures| -> Option<DateTime<FixedOffset>> {
             let year = captures.get(1)?.as_str().parse::<i32>().ok()?;
@@ -143,16 +151,8 @@ pub fn extract_date_from_filename(filename: &str) -> Option<DateTime<FixedOffset
             let min = captures.get(5)?.as_str().parse::<u32>().ok()?;
             let sec = captures.get(6)?.as_str().parse::<u32>().ok()?;
 
-            match Local.from_local_datetime(
-                &NaiveDate::from_ymd_opt(year, month, day)?.and_hms_opt(hour, min, sec)?,
-            ) {
-                Single(dt) => Some(dt.fixed_offset()),
-                Ambiguous(early_dt, _) => Some(early_dt.fixed_offset()),
-                LocalResult::None => {
-                    warn!("Weird local date: {:?}", filename);
-                    None
-                }
-            }
+            let naive = NaiveDate::from_ymd_opt(year, month, day)?.and_hms_opt(hour, min, sec)?;
+            Some(Utc.from_utc_datetime(&naive).fixed_offset())
         };
 
     // 1. Screenshot format: Screenshot_2014-06-01-20-44-50.png