make cookie auto-expire at the end of the festival

src/main.rs

@@ -14,7 +14,7 @@ use std::{
     str::FromStr,
     sync::{Arc, LazyLock},
 };
-use time::{Duration, OffsetDateTime};
+use time::{Date, Month, OffsetDateTime, Time};
 use tower_http::services::ServeDir;
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
 use uuid::Uuid;
@@ -156,7 +156,10 @@ impl Backend {
             Some(uuid) => (cookies, self.get_client(&uuid).await),
             None => {
                 let new_id = Uuid::new_v4();
-                let expiration_date = OffsetDateTime::now_utc() + Duration::days(30);
+                let expiration_date = OffsetDateTime::new_utc(
+                    Date::from_calendar_date(2025, Month::September, 7).unwrap(),
+                    Time::from_hms(20, 0, 0).unwrap(),
+                );
                 let mut cookie = Cookie::new("client_id", new_id.to_string());
                 cookie.set_expires(Expiration::DateTime(expiration_date));
                 cookie.set_http_only(true);