Use TZ=UTC0, not TZ=utc (which isn't portable).

diff --git a/tests/touch/relative b/tests/touch/relative
index 806f4b7c5867e9fcbc8ab037730c06c2933cfd94..a6f45b994408d3c4df2379b87887eba71d31d560 100755 (executable)
--- a/tests/touch/relative
+++ b/tests/touch/relative
@@ -29,7 +29,7 @@ fail=0
 # Set times back by 30 minutes.
 touch --ref f --date='-30 min' f || fail=1
 
-TZ=utc command ls -og --time-style=+%Y-%m-%dT%H:%M:%S f > out.1 || fail
+TZ=UTC0 command ls -og --time-style=+%Y-%m-%dT%H:%M:%S f > out.1 || fail
 sed 's/ f$//;s/.* //' out.1 > out
 
 cat <<\EOF > exp || fail=1