diff --git a/Makefile b/Makefile
index 870d4dcdc..52066d7c2 100644
--- a/Makefile
+++ b/Makefile
@@ -228,7 +228,7 @@ watch-js:
 	(cd frontend &&	env NODE_ENV=development npm run watch)
 test-js:
 	$(info Running JS unit tests...)
-	(cd frontend && env NODE_ENV=development BABEL_ENV=test npm run test)
+	(cd frontend && env TZ=UTC NODE_ENV=development BABEL_ENV=test npm run test)
 acceptance:
 	$(info Running public-mode tests in 'chromium:headless'...)
 	(cd frontend &&	npm run testcafe -- chrome:headless --test-grep "^(Common|Core)\:*" --test-meta mode=public --config-file ./testcaferc.json "tests/acceptance")