diff --git a/src/datetime.rs b/src/datetime.rs
index 0d8e0b4..41b0c2a 100644
--- a/src/datetime.rs
+++ b/src/datetime.rs
@@ -9,7 +9,7 @@ use {
     std::{cmp, fmt},
 };
 
-#[derive(Clone, Debug, Eq, PartialEq)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 pub struct DateTime {
     pub year: Year,