--- tardy-1.28/test/00/t0075a.sh
+++ tardy-1.28/test/00/t0075a.sh
@@ -19,6 +19,7 @@
 
 TEST_SUBJECT="tarballs >2GB"
 . test_prelude
+export TZ=UTC
 
 #                                         |||||
 #    beware potential timezone mismatch:  vvvvv