fix: use PDT isntead of UTC

remote/cache-service/Cargo.toml

@@ -10,6 +10,7 @@ workspace = true
 anyhow = "1.0"
 axum = "0.8"
 chrono = "0.4"
+chrono-tz = "0.10"
 noisebell-common = { path = "../noisebell-common" }
 reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
 rusqlite = { version = "0.33", features = ["bundled"] }

remote/cache-service/src/api.rs

@@ -5,6 +5,7 @@ use axum::http::{header, HeaderMap, StatusCode};
 use axum::response::{IntoResponse, Response};
 use axum::Json;
 use chrono::{DateTime, Utc};
+use chrono_tz::America::Los_Angeles;
 use noisebell_common::{validate_bearer, CacheStatusResponse, DoorStatus, WebhookPayload};
 use tokio::sync::Mutex;
 use tracing::{error, info};
@@ -115,7 +116,9 @@ fn unix_now() -> u64 {
 
 fn format_full_timestamp(ts: u64) -> String {
     DateTime::from_timestamp(ts as i64, 0)
-        .map(|dt: DateTime<Utc>| dt.format("%A, %B %-d, %Y at %-I:%M:%S %p UTC").to_string())
+        .map(|dt: DateTime<Utc>| {
+            dt.with_timezone(&Los_Angeles).format("%A, %B %-d, %Y at %-I:%M:%S %p %Z").to_string()
+        })
         .unwrap_or_else(|| format!("unix timestamp {ts}"))
 }
 
@@ -364,6 +367,18 @@ mod tests {
         assert_eq!(format_duration(3_723), "1 hour and 2 minutes");
     }
 
+    #[test]
+    fn format_full_timestamp_uses_san_francisco_timezone() {
+        let ts = 1_711_312_063;
+        let expected = DateTime::from_timestamp(ts, 0)
+            .unwrap()
+            .with_timezone(&Los_Angeles)
+            .format("%A, %B %-d, %Y at %-I:%M:%S %p %Z")
+            .to_string();
+
+        assert_eq!(format_full_timestamp(ts as u64), expected);
+    }
+
     #[test]
     fn status_summary_includes_since_and_last_checked() {
         let summary = status_summary(DoorStatus::Open, Some(1_000), Some(1_125), 1_180);