diff --git a/firmware/src/http.rs b/firmware/src/http.rs
index ee1bbe5..65ec445 100644
--- a/firmware/src/http.rs
+++ b/firmware/src/http.rs
@@ -2,7 +2,7 @@ use crate::json::{self, FromJson, ToJson};
 use crate::time;
 use crate::wifi::{DnsSocket, TcpClient, TcpConnection, Wifi};
 use alloc::vec::Vec;
-use chrono::{DateTime, Utc};
+use chrono::DateTime;
 use core::convert::Infallible;
 use core::{fmt, str};
 use embedded_io_async::{BufRead, Read};
@@ -219,10 +219,9 @@ impl Connection<'_> {
             .headers()
             .find_map(|(k, v)| (k == "Date").then_some(v))
             .and_then(|v| str::from_utf8(v).ok())
-            .and_then(|s| DateTime::parse_from_rfc2822(s).ok())
-            .map(|d| d.with_timezone(&Utc));
+            .and_then(|s| DateTime::parse_from_rfc2822(s).ok());
         if let Some(time) = time {
-            time::set(time);
+            time::set(&time);
         }
 
         // Check HTTP response status
diff --git a/firmware/src/time.rs b/firmware/src/time.rs
index 1c67ec1..356e708 100644
--- a/firmware/src/time.rs
+++ b/firmware/src/time.rs
@@ -1,4 +1,4 @@
-use chrono::{DateTime, TimeDelta, Utc};
+use chrono::{DateTime, TimeDelta, TimeZone, Utc};
 use core::cell::RefCell;
 use embassy_sync::blocking_mutex::CriticalSectionMutex;
 use embassy_time::Instant;
@@ -49,13 +49,14 @@ pub fn uptime() -> Option<TimeDelta> {
     Instant::now().to_duration()
 }
 
-/// Current time
+/// Current time. Always given in UTC since the local timezone is unknown.
 pub fn now() -> Option<DateTime<Utc>> {
     Instant::now().to_datetime()
 }
 
 /// Set current time by using the given current time to calculate the time of system start
-pub fn set(now: DateTime<Utc>) {
+pub fn set<TZ: TimeZone>(now: &DateTime<TZ>) {
+    let now = now.with_timezone(&Utc);
     if let Some(uptime) = uptime() {
         set_start_time(now - uptime);
         debug!("Time: Current time set to {}", now);