diff --git a/quark.c b/quark.c
index db036b5..b6e7578 100644
--- a/quark.c
+++ b/quark.c
@@ -478,7 +478,7 @@ tstamp(void) {
 	static char res[30];
 	time_t t = time(NULL);
 
-	strftime(res, sizeof res, "%a, %d %b %Y %H:%M:%S %Z", localtime(&t));
+	strftime(res, sizeof res, "%a, %d %b %Y %H:%M:%S GMT", gmtime(&t));
 	return res;
 }