diff --git a/bin/test b/bin/test
index af22466..b27f8a8 100755
--- a/bin/test
+++ b/bin/test
@@ -23,7 +23,7 @@ docker run --rm "$img" bash -ec '
     prettier --version
     shellcheck --version
     govulncheck -version
-    TZ=America/New_York date +%Z
+    test -e /usr/share/zoneinfo/America/New_York
     zstd --version
     sqlite3 --version
     vips --version
diff --git a/build.sh b/build.sh
index deb2fe7..7b3cef5 100755
--- a/build.sh
+++ b/build.sh
@@ -136,7 +136,7 @@ go version
 govulncheck -version
 golangci-lint version
 shellcheck --version
-TZ=America/New_York date +%Z
+test -e /usr/share/zoneinfo/America/New_York
 zstd --version
 sqlite3 --version
 vips --version