diff --git a/crates/core/src/time.rs b/crates/core/src/time.rs
index 328ae792d7..4bab05d392 100644
--- a/crates/core/src/time.rs
+++ b/crates/core/src/time.rs
@@ -154,7 +154,7 @@ impl Display for DateTimeUtc {
 }
 
 impl DateTimeUtc {
-    const FORMAT: &'static str = "%Y-%m-%dT%H:%M:%S%.6f+00:00";
+    const FORMAT: &'static str = "%Y-%m-%dT%H:%M:%S%.9f+00:00";
 
     /// Returns a DateTimeUtc which corresponds to the current date.
     pub fn now() -> Self {
@@ -381,7 +381,7 @@ pub mod test_utils {
     //! Time related test utilities.
 
     /// Genesis time used during tests.
-    pub const GENESIS_TIME: &str = "2023-08-30T00:00:00.000000+00:00";
+    pub const GENESIS_TIME: &str = "2023-08-30T00:00:00.000000000+00:00";
 }
 
 #[cfg(test)]
diff --git a/crates/tests/src/e2e/ibc_tests.rs b/crates/tests/src/e2e/ibc_tests.rs
index 7bf2c8a571..4bb1c83965 100644
--- a/crates/tests/src/e2e/ibc_tests.rs
+++ b/crates/tests/src/e2e/ibc_tests.rs
@@ -1149,7 +1149,10 @@ fn make_consensus_state(
 ) -> Result<TmConsensusState> {
     let header = query_header(test, height)?;
     let cs = TmConsensusState::from(header);
-    println!("DEBUG: consensus state with queried header: {cs:?}, at height {height}");
+    println!(
+        "DEBUG: consensus state with queried header: {cs:?}, at height \
+         {height}"
+    );
     Ok(cs)
 }
 
@@ -1206,6 +1209,10 @@ fn update_client(
         .fetch_light_block(height.into())
         .expect("the light client couldn't get a light block");
 
+    println!(
+        "DEBUG: target block header {:?}",
+        target_block.signed_header.header
+    );
     let header = IbcTmHeader {
         signed_header: target_block.signed_header,
         validator_set: target_block.validators,