Code1 now only submits within the correct time window

src/codes/code1.rs

@@ -1,9 +1,13 @@
 use axum::{extract::ConnectInfo, http::StatusCode, Json};
+use chrono::Timelike;
 use serde_json::Value;
 use std::net::SocketAddr;
 
 pub const ID: &str = "code1";
 const TARGET_DELAY_MS: i64 = 6430;
+const MAX_BUZZ_DELTA_MS: i64 = 500;
+const ACCEPTANCE_START_SECONDS: u32 = 11 * 60 * 60;
+const ACCEPTANCE_END_SECONDS: u32 = 13 * 60 * 60 + 30 * 60;
 const SELF_NOTIFICATION: &str = "Code 1 has been submitted while the server is live.";
 const CHALLENGE_1_FIRST: &str = "SECDED-13\nPARITY MSB...LSB";
 const CHALLENGE_1_SECOND: &str = "0x144A
@@ -77,10 +81,32 @@ pub async fn buzz_event_handler(
         ));
     }
 
+    let chicago_now = chrono::Utc::now().with_timezone(&chrono_tz::America::Chicago);
+    let seconds_since_midnight = chicago_now.num_seconds_from_midnight();
+    let after_start = seconds_since_midnight >= ACCEPTANCE_START_SECONDS;
+    let before_or_at_end = seconds_since_midnight < ACCEPTANCE_END_SECONDS
+        || (seconds_since_midnight == ACCEPTANCE_END_SECONDS && chicago_now.nanosecond() == 0);
+    if !after_start || !before_or_at_end {
+        leptos::logging::log!(
+            "Code 1 buzz rejected outside acceptance window: local_time={}, source={}",
+            chicago_now.format("%Y-%m-%d %H:%M:%S %Z"),
+            address.ip()
+        );
+        return Ok(StatusCode::OK);
+    }
+
+    let delta_ms = delay_ms - TARGET_DELAY_MS;
+    if delta_ms.abs() > MAX_BUZZ_DELTA_MS {
+        leptos::logging::log!(
+            "Code 1 buzz rejected: delay_ms={delay_ms}, delta_ms={delta_ms}, source={}",
+            address.ip()
+        );
+        return Ok(StatusCode::OK);
+    }
+
     let live = crate::manage::server_live_state();
     crate::codes::history::record_successful_submission(address.ip(), live, ID)
         .map_err(|error| (StatusCode::INTERNAL_SERVER_ERROR, error.to_string()))?;
-    let delta_ms = delay_ms - TARGET_DELAY_MS;
     on_submit(live, delta_ms).await.map_err(|error| {
         leptos::logging::log!("Code 1 buzz event failed: {error}");
         (