diff --git a/src/datetime.rs b/src/datetime.rs
index afc0ced..0e86f2a 100644
--- a/src/datetime.rs
+++ b/src/datetime.rs
@@ -283,7 +283,7 @@ mod tests {
     #[test]
     fn display() {
         let mut dt = DateTime::from_timestamp(1706571482);
-        assert_eq!(dt.display(), "Mon Jan 29 23:38:02 Utc 2024");
+        assert_eq!(dt.display(), "Mon Jan 29 23:38:02 UTC 2024");
         dt.zone = TimeZone::Offset {
             sign: crate::zone::Sign::Positive,
             hours: 4,
diff --git a/src/zone.rs b/src/zone.rs
index 2effadc..53f9442 100644
--- a/src/zone.rs
+++ b/src/zone.rs
@@ -97,7 +97,7 @@ impl TimeZone {
 
     pub fn display(&self) -> String {
         match self {
-            Self::Utc => "Utc".into(),
+            Self::Utc => "UTC".into(),
             _ => format!("{self}"),
         }
     }