diff --git a/crates/projection-irc/tests/lib.rs b/crates/projection-irc/tests/lib.rs
index e50a629..cffc35f 100644
--- a/crates/projection-irc/tests/lib.rs
+++ b/crates/projection-irc/tests/lib.rs
@@ -2,7 +2,7 @@ use std::io::ErrorKind;
 use std::time::Duration;
 
 use anyhow::{anyhow, Result};
-use chrono::SecondsFormat;
+use chrono::{DateTime, SecondsFormat};
 use prometheus::Registry as MetricsRegistry;
 use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader};
 use tokio::net::tcp::{ReadHalf, WriteHalf};
@@ -626,6 +626,12 @@ async fn server_time_capability() -> Result<()> {
     ))
     .await?;
 
+    // formatting check
+    assert_eq!(
+        DateTime::parse_from_rfc3339(&"2024-01-01T10:00:32.123Z").unwrap().to_rfc3339_opts(SecondsFormat::Millis, true),
+        "2024-01-01T10:00:32.123Z"
+    );
+
     s.send("QUIT :Leaving").await?;
     s.expect(":testserver ERROR :Leaving the server").await?;
     s.expect_eof().await?;