diff --git a/stand/common/newvers.sh b/stand/common/newvers.sh
index 8541d61ed76c..368f233de1e1 100755
--- a/stand/common/newvers.sh
+++ b/stand/common/newvers.sh
@@ -45,7 +45,7 @@ shift $((OPTIND - 1))
 LC_ALL=C; export LC_ALL
 u=${USER-root} h=${HOSTNAME-`hostname`}
 if [ -n "$SOURCE_DATE_EPOCH" ]; then
-	if ! t=$(date -ur $SOURCE_DATE_EPOCH 2>/dev/null); then
+	if ! t=$(date -d @$SOURCE_DATE_EPOCH 2>/dev/null); then
 		echo "Invalid SOURCE_DATE_EPOCH" >&2
 		exit 1
 	fi