diff --git a/frontend/eslint.config.js b/frontend/eslint.config.js
index 2591375..5799442 100644
--- a/frontend/eslint.config.js
+++ b/frontend/eslint.config.js
@@ -52,6 +52,13 @@ export default defineConfig(
 				svelteConfig
 			}
 		},
-		rules: {}
+		rules: {
+			// The prefer-svelte-reactivity rule pushes SvelteDate (svelte/reactivity), which this
+			// codebase deliberately removed (commit 55b2c8c, "SvelteDate→Date purge") because it
+			// caused real bugs. All Date usage here is local wall-clock computation (the
+			// parseWallClockDate helpers in src/lib/utils/timeSlots.ts), not reactive $state Date
+			// mutations, and the rule has no options to allowlist Date — so disable it outright.
+			'svelte/prefer-svelte-reactivity': 'off'
+		}
 	}
 );