diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f7ef253fc..8da245115 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,6 +14,6 @@ jobs:
       run: bin/package make
     - name: Regression tests
       run: |
-        export TZ=GMT
+        export TZ=UTC
         ulimit -n 1024
         script -q -e -c "bin/shtests"
diff --git a/src/cmd/ksh93/tests/builtins.sh b/src/cmd/ksh93/tests/builtins.sh
index c1bc4a435..948c1c451 100755
--- a/src/cmd/ksh93/tests/builtins.sh
+++ b/src/cmd/ksh93/tests/builtins.sh
@@ -311,8 +311,8 @@ fi
 [[ $(printf '%q\n') == '' ]] || err_exit 'printf "%q" with missing arguments'
 # we won't get hit by the one second boundary twice, right?
 expect= actual=
-{ expect=$(LC_ALL=C date) && actual=$(LC_ALL=C printf '%T\n' now) && [[ $actual == "$expect" ]]; } ||
-{ expect=$(LC_ALL=C date) && actual=$(LC_ALL=C printf '%T\n' now) && [[ $actual == "$expect" ]]; } ||
+{ expect=$(LC_ALL=C date | sed 's/ GMT / UTC /') && actual=$(LC_ALL=C printf '%T\n' now) && [[ $actual == "$expect" ]]; } ||
+{ expect=$(LC_ALL=C date | sed 's/ GMT / UTC /') && actual=$(LC_ALL=C printf '%T\n' now) && [[ $actual == "$expect" ]]; } ||
 err_exit 'printf "%T" now' "(expected $(printf %q "$expect"), got $(printf %q "$actual"))"
 behead()
 {