try

Author: alexfauquette

package.json

@@ -35,18 +35,18 @@
     "test:coverage": "cross-env NODE_ENV=test BABEL_ENV=coverage nyc mocha 'packages/**/*.test.{js,ts,tsx}' --exclude '**/node_modules/**' && nyc report -r lcovonly",
     "test:coverage:html": "cross-env NODE_ENV=test BABEL_ENV=coverage nyc mocha 'packages/**/*.test.{js,ts,tsx}' --exclude '**/node_modules/**' && nyc report --reporter=html",
     "test:karma": "cross-env NODE_ENV=test karma start test/karma.conf.js",
-    "test:unit": "cross-env NODE_ENV=test  TZ='CET' mocha 'packages/**/*.test.{js,ts,tsx}' -n expose_gc",
+    "test:unit": "cross-env NODE_ENV=test mocha 'packages/**/*.test.{js,ts,tsx}' -n expose_gc",
     "test:e2e": "cross-env NODE_ENV=production yarn test:e2e:build && concurrently --success first --kill-others \"yarn test:e2e:run\" \"yarn test:e2e:server\"",
     "test:e2e:build": "webpack --config test/e2e/webpack.config.js",
     "test:e2e:dev": "concurrently \"yarn test:e2e:build --watch\" \"yarn test:e2e:server\"",
-    "test:e2e:run": " TZ='CET' mocha --config test/e2e/.mocharc.js 'test/e2e/**/*.test.{js,ts,tsx}'",
+    "test:e2e:run": "mocha --config test/e2e/.mocharc.js 'test/e2e/**/*.test.{js,ts,tsx}'",
     "test:e2e:server": "serve test/e2e -p 5001",
     "test:e2e-website": "playwright test test/e2e-website --config test/e2e-website/playwright.config.ts",
     "test:e2e-website:dev": "PLAYWRIGHT_TEST_BASE_URL=http://localhost:3001 playwright test test/e2e-website --config test/e2e-website/playwright.config.ts",
     "test:regressions": "cross-env NODE_ENV=production yarn test:regressions:build && concurrently --success first --kill-others \"yarn test:regressions:run\" \"yarn test:regressions:server\"",
     "test:regressions:build": "webpack --config test/regressions/webpack.config.js",
     "test:regressions:dev": "concurrently \"yarn test:regressions:build --watch\" \"yarn test:regressions:server\"",
-    "test:regressions:run": " TZ='CET' mocha --config test/regressions/.mocharc.js --delay 'test/regressions/**/*.test.js'",
+    "test:regressions:run": "mocha --config test/regressions/.mocharc.js --delay 'test/regressions/**/*.test.js'",
     "test:regressions:server": "serve test/regressions -p 5001",
     "test:performance": "cross-env NODE_ENV=production yarn test:performance:build && concurrently --success first --kill-others \"yarn test:performance:run\" \"yarn test:performance:server\"",
     "test:performance:dev": "concurrently \"yarn test:performance:build --watch\" \"yarn test:performance:server\"",

packages/x-date-pickers/src/DateTimeField/tests/timezone.DateTimeField.test.tsx

@@ -10,7 +10,7 @@ describe('<DateTimeField /> - TimeZone', () => {
       const { setProps } = render(<DateTimeField />);
       const input = screen.getByRole('textbox');
 
-      const date = adapter.date(new Date(2020, 5, 18, 16, 30, 10)).setZone('UTC');
+      const date = adapter.date(new Date('2020-06-18T14:30:10.000Z')).setZone('UTC');
       setProps({ value: date });
 
       expectInputValue(input, '6 / 18 / 2020 02:30 PM');