diff --git a/lib-bms-protocol/src/lib.rs b/lib-bms-protocol/src/lib.rs
index cb2b83f..a8bfeb2 100644
--- a/lib-bms-protocol/src/lib.rs
+++ b/lib-bms-protocol/src/lib.rs
@@ -9,7 +9,7 @@ mod types;
 mod timestamp;
 
 pub use types::{Stored_U26, Transit_U26, Transit_I26, U26Error};
-pub use timestamp::{Store_DateTimeUtc, Transit_DateTimeUtc};
+pub use timestamp::{Store_DateTimeUtc, Transit_DateTimeUtc, DateTimeUtcError};
 
 use embedded_hal::i2c::{I2c, Operation, SevenBitAddress};
 use thiserror::Error;
diff --git a/lib-bms-protocol/src/timestamp.rs b/lib-bms-protocol/src/timestamp.rs
index 34d01ed..ef2d6b7 100644
--- a/lib-bms-protocol/src/timestamp.rs
+++ b/lib-bms-protocol/src/timestamp.rs
@@ -1,12 +1,16 @@
 use chrono::{DateTime, Utc};
+use thiserror::Error;
 
 use crate::types::{Stored_U26, Transit_U26, U26Error};
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Error)]
 /// Error type for DateTimeUtc wrapper types
 pub enum DateTimeUtcError {
+    #[error("timestamp overflow")]
     Overflow,
+    #[error("timestamp invalid")]
     InvalidTimestamp,
+    #[error("timestamp conversion error")]
     ConversionError,
 }