diff --git a/openpgp-card/src/card_do.rs b/openpgp-card/src/card_do.rs
index 19b5ae5..28b5546 100644
--- a/openpgp-card/src/card_do.rs
+++ b/openpgp-card/src/card_do.rs
@@ -252,11 +252,15 @@ impl KeyGenerationTime {
         self.0
     }
 
-    pub fn formatted(&self) -> String {
+    pub fn to_datetime(&self) -> DateTime<Utc> {
         let d = UNIX_EPOCH + Duration::from_secs(self.get() as u64);
-        let datetime = DateTime::<Utc>::from(d);
+        DateTime::<Utc>::from(d)
+    }
+}
 
-        datetime.format("%Y-%m-%d %H:%M:%S").to_string()
+impl Display for KeyGenerationTime {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.to_datetime())
     }
 }
 
diff --git a/tools/src/bin/opgpcard/main.rs b/tools/src/bin/opgpcard/main.rs
index 937ca09..59a6f55 100644
--- a/tools/src/bin/opgpcard/main.rs
+++ b/tools/src/bin/opgpcard/main.rs
@@ -465,7 +465,7 @@ fn print_status(ident: Option<String>, verbose: bool) -> Result<()> {
         println!("  fingerprint: {}", fp.to_spaced_hex());
     }
     if let Some(kgt) = kgt.signature() {
-        println! {"  created: {}", kgt.formatted()};
+        println! {"  created: {}", kgt.to_datetime()};
     }
     println! {"  algorithm: {}", open.algorithm_attributes(KeyType::Signing)?};
     if verbose {
@@ -480,7 +480,7 @@ fn print_status(ident: Option<String>, verbose: bool) -> Result<()> {
         println!("  fingerprint: {}", fp.to_spaced_hex());
     }
     if let Some(kgt) = kgt.decryption() {
-        println! {"  created: {}", kgt.formatted()};
+        println! {"  created: {}", kgt.to_datetime()};
     }
     println! {"  algorithm: {}", open.algorithm_attributes(KeyType::Decryption)?};
     if verbose {
@@ -495,7 +495,7 @@ fn print_status(ident: Option<String>, verbose: bool) -> Result<()> {
         println!("  fingerprint: {}", fp.to_spaced_hex());
     }
     if let Some(kgt) = kgt.authentication() {
-        println! {"  created: {}", kgt.formatted()};
+        println! {"  created: {}", kgt.to_datetime()};
     }
     println! {"  algorithm: {}", open.algorithm_attributes(KeyType::Authentication)?};
     if verbose {