diff --git a/tests/tests.sh b/tests/tests.sh
index e0e39d6..e918022 100755
--- a/tests/tests.sh
+++ b/tests/tests.sh
@@ -38,7 +38,7 @@ RM="rm -f"
 _date()
 {
 	if [ -n "$SOURCE_DATE_EPOCH" ]; then
-		$DATE -r "$SOURCE_DATE_EPOCH"
+		$DATE -d "@$SOURCE_DATE_EPOCH"
 	else
 		$DATE
 	fi