diff --git a/.oxlint-backend-rules.cjs b/.oxlint-backend-rules.cjs
index b64edfeba..310cc3e7b 100644
--- a/.oxlint-backend-rules.cjs
+++ b/.oxlint-backend-rules.cjs
@@ -3,6 +3,34 @@ module.exports = {
     name: 'oodikone',
   },
   rules: {
+    'no-date-now': {
+      meta: {
+        type: 'suggestion',
+        docs: {
+          description: 'Require the backend clock helper instead of Date.now()',
+        },
+        schema: [],
+        messages: {
+          useNow: 'Use now().getTime() instead of Date.now() so the current time can be controlled in tests.',
+        },
+      },
+      create(context) {
+        return {
+          CallExpression(node) {
+            if (
+              node.callee.type === 'MemberExpression' &&
+              node.callee.object.type === 'Identifier' &&
+              node.callee.object.name === 'Date' &&
+              node.callee.property.type === 'Identifier' &&
+              node.callee.property.name === 'now' &&
+              node.arguments.length === 0
+            ) {
+              context.report({ node, messageId: 'useNow' })
+            }
+          },
+        }
+      },
+    },
     'no-new-date': {
       meta: {
         type: 'suggestion',
diff --git a/.oxlintrc.json b/.oxlintrc.json
index 8f64dc957..789181ec4 100644
--- a/.oxlintrc.json
+++ b/.oxlintrc.json
@@ -239,7 +239,8 @@
       "files": ["services/backend/src/**/*.{js,ts,tsx}"],
       "excludeFiles": ["services/backend/src/util/clock.ts"],
       "rules": {
-        "oodikone/no-new-date": "error"
+        "oodikone/no-new-date": "error",
+        "oodikone/no-date-now": "error"
       }
     },
     {