diff --git a/core/src/date/day.rs b/core/src/date/day.rs
index 05ca27b8..1ea281f9 100644
--- a/core/src/date/day.rs
+++ b/core/src/date/day.rs
@@ -48,13 +48,13 @@ mod tests {
 	use super::*;
 
 	#[test]
-	#[should_panic]
+	#[should_panic(expected = "day value 0 is out of range")]
 	fn day_0() {
 		Day::new(0);
 	}
 
 	#[test]
-	#[should_panic]
+	#[should_panic(expected = "day value 32 is out of range")]
 	fn day_32() {
 		Day::new(32);
 	}
diff --git a/core/src/date/year.rs b/core/src/date/year.rs
index 94278e09..b1e871ec 100644
--- a/core/src/date/year.rs
+++ b/core/src/date/year.rs
@@ -101,7 +101,7 @@ mod tests {
 	use super::*;
 
 	#[test]
-	#[should_panic]
+	#[should_panic(expected = "year 0 is invalid")]
 	fn year_0() {
 		Year::new(0);
 	}