diff --git a/include/os_detector b/include/os_detector
index a99ad45f..db3462ef 100644
--- a/include/os_detector
+++ b/include/os_detector
@@ -113,7 +113,7 @@ gnu_convert_date_to_timestamp() {
 }
 
 bsd_convert_date_to_timestamp() {
-  date -j -f "%Y-%m-%dT%H:%M:%SZ" "$1" "+%s"
+  date -j -f "%Y-%m-%dT%H:%M:%S" "$1" "+%s"
 }
 
 gnu_test_tcp_connectivity() {