diff --git a/apps/api/features/step-definitions/planning.steps.ts b/apps/api/features/step-definitions/planning.steps.ts
index 12c36eb..952660a 100644
--- a/apps/api/features/step-definitions/planning.steps.ts
+++ b/apps/api/features/step-definitions/planning.steps.ts
@@ -1,10 +1,12 @@
 import assert from "node:assert/strict";
+import { DateTime } from "@batch-cooking/date-tools";
 import { Given, Then, When } from "@cucumber/cucumber";
 import { prisma } from "../../src/db/prisma.js";
 import type { CustomWorld } from "../support/world.js";
 
+/** `GET /planning` takes `?date=` explicitly — this scenario wording ("the current planning") maps to "today". */
 When("I request the current planning", async function (this: CustomWorld) {
-  this.response = await this.agent.get("/planning/current");
+  this.response = await this.agent.get("/planning").query({ date: DateTime.utc().toISODate() });
 });
 
 Then("the current planning response should be empty", function (this: CustomWorld) {
diff --git a/apps/api/package.json b/apps/api/package.json
index ddb49cb..e8bdb61 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -18,6 +18,7 @@
     "seed": "tsx prisma/seed.ts"
   },
   "dependencies": {
+    "@batch-cooking/date-tools": "workspace:*",
     "@batch-cooking/error-tools": "workspace:*",
     "@batch-cooking/express-tools": "workspace:*",
     "@batch-cooking/shared": "workspace:*",
diff --git a/apps/api/src/modules/planning/planning.routes.ts b/apps/api/src/modules/planning/planning.routes.ts
index 278cf2e..39eb8e2 100644
--- a/apps/api/src/modules/planning/planning.routes.ts
+++ b/apps/api/src/modules/planning/planning.routes.ts
@@ -1,21 +1,36 @@
+import { parseDateOnly } from "@batch-cooking/date-tools";
+import { HttpError } from "@batch-cooking/error-tools";
 import { wrapAsyncHandler } from "@batch-cooking/express-tools";
+import { ErrorCode, getPlanningByDateSchema } from "@batch-cooking/shared";
 import { Router } from "express";
 import { type AuthLocals, requireAuth } from "../../middlewares/require-auth.js";
-import { getCurrentPlanning } from "./planning.service.js";
+import { getPlanningForDate } from "./planning.service.js";
 
 /** Router mounted at `/planning` in app.ts. */
 export const planningRouter = Router();
 
 /**
- * Returns the authenticated user's household's planning for today, or
- * `null` if none exists yet — a valid, common response, not an error (see
- * {@link getCurrentPlanning}).
+ * Returns the authenticated user's household's planning covering `?date=`
+ * (`YYYY-MM-DD`), or `null` if none exists yet — a valid, common response,
+ * not an error (see {@link getPlanningForDate}). Used both for "today"
+ * (the planning page's initial load) and for any other week the planning
+ * page's week navigator/calendar picks.
  */
 planningRouter.get(
-  "/current",
+  "/",
   requireAuth,
-  wrapAsyncHandler<unknown, AuthLocals>(async (_req, res) => {
-    const planning = await getCurrentPlanning(res.locals.userProfile.houseId);
+  wrapAsyncHandler<unknown, AuthLocals>(async (req, res) => {
+    const input = getPlanningByDateSchema.parse(req.query);
+    const date = parseDateOnly(input.date);
+    if (date === null) {
+      throw new HttpError(
+        400,
+        ErrorCode.VALIDATION_ERROR,
+        `Not a real calendar date: ${input.date}`,
+      );
+    }
+
+    const planning = await getPlanningForDate(res.locals.userProfile.houseId, date);
     res.status(200).json(planning);
   }),
 );
diff --git a/apps/api/src/modules/planning/planning.service.ts b/apps/api/src/modules/planning/planning.service.ts
index 67eda25..380645e 100644
--- a/apps/api/src/modules/planning/planning.service.ts
+++ b/apps/api/src/modules/planning/planning.service.ts
@@ -1,35 +1,40 @@
+import { type DateTime, toDateOnly } from "@batch-cooking/date-tools";
 import type { PlanningView } from "@batch-cooking/shared";
 import { prisma } from "../../db/prisma.js";
 
 /**
- * Finds the household's planning that covers today's date and shapes it
- * into a {@link PlanningView} (recipes resolved to `{id, name}`).
+ * Finds the household's planning that covers `date` and shapes it into a
+ * {@link PlanningView} (recipes resolved to `{id, name}`). `date` is
+ * whatever the caller wants "now" to mean — the current `/planning` route
+ * passes a `date-tools`-parsed `?date=` query param, letting a caller look
+ * up any week's planning, not just the one covering today.
  *
- * Returns `null` for two distinct, both entirely normal states — a `house_id`
- * of `null` (a profile always gets a house at signup today, but the column
- * is nullable) and "no planning row covers today" (the expected case until
- * planning creation is built) — neither is an error, so both collapse to
- * the same "nothing to show yet" result rather than throwing.
+ * Returns `null` for two distinct, both entirely normal states — a
+ * `houseId` of `null` (the profile has no household yet — households are no
+ * longer created automatically at signup, see `auth.service.ts`) and "no
+ * planning row covers this date" (the expected case until planning
+ * creation is built) — neither is an error, so both collapse to the same
+ * "nothing to show yet" result rather than throwing.
  */
-export async function getCurrentPlanning(houseId: number | null): Promise<PlanningView | null> {
+export async function getPlanningForDate(
+  houseId: number | null,
+  date: DateTime,
+): Promise<PlanningView | null> {
   if (houseId === null) {
     return null;
   }
 
   // `startDate`/`finishDate` are `@db.Date` columns (no time-of-day
-  // component) — compare against today's date at UTC midnight so the
-  // comparison lines up with how Postgres stores/returns them, regardless
-  // of the server's local timezone.
-  const today = new Date();
-  const todayDateOnly = new Date(
-    Date.UTC(today.getUTCFullYear(), today.getUTCMonth(), today.getUTCDate()),
-  );
+  // component) — comparing against a UTC-midnight JS `Date` lines up with
+  // how Postgres stores/returns them, regardless of the server's local
+  // timezone.
+  const dateOnly = toDateOnly(date).toJSDate();
 
   const planning = await prisma.planning.findFirst({
     where: {
       houseId,
-      startDate: { lte: todayDateOnly },
-      finishDate: { gte: todayDateOnly },
+      startDate: { lte: dateOnly },
+      finishDate: { gte: dateOnly },
     },
     // A household should never have two plannings covering the same day,
     // but nothing in the schema enforces that yet — pick the most recently
diff --git a/apps/api/test/planning.test.ts b/apps/api/test/planning.test.ts
index 71fffe0..2dd885d 100644
--- a/apps/api/test/planning.test.ts
+++ b/apps/api/test/planning.test.ts
@@ -1,3 +1,4 @@
+import { DateTime } from "@batch-cooking/date-tools";
 import { ErrorCode, type SignupInput } from "@batch-cooking/shared";
 import { faker } from "@faker-js/faker";
 import { expect } from "chai";
@@ -18,6 +19,18 @@ function buildSignupPayload(): SignupInput {
   };
 }
 
+/** Today, as the `YYYY-MM-DD` string `GET /planning`'s `?date=` expects. */
+function today(): string {
+  return isoDate(DateTime.utc());
+}
+
+/** `toISODate()` only returns `null` for an invalid `DateTime` — never the case for the always-valid values built in this file. */
+function isoDate(date: DateTime): string {
+  const iso = date.toISODate();
+  if (iso === null) throw new Error("Unexpectedly invalid DateTime in a test helper");
+  return iso;
+}
+
 describe("Planning", () => {
   const app = createApp();
 
@@ -29,63 +42,93 @@ describe("Planning", () => {
     await prisma.$disconnect();
   });
 
-  describe("GET /planning/current", () => {
+  describe("GET /planning", () => {
     it("rejects requests without a session cookie with 401 NOT_AUTHENTICATED", async () => {
-      const res = await request(app).get("/planning/current");
+      const res = await request(app).get("/planning").query({ date: today() });
 
       expect(res.status).to.equal(401);
       expect(res.body.code).to.equal(ErrorCode.NOT_AUTHENTICATED);
     });
 
-    it("returns null when the household has no planning covering today", async () => {
+    it("rejects a missing date with 400 VALIDATION_ERROR", async () => {
       const agent = request.agent(app);
       await agent.post("/auth/signup").send(buildSignupPayload());
 
-      const res = await agent.get("/planning/current");
+      const res = await agent.get("/planning");
+
+      expect(res.status).to.equal(400);
+      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
+    });
+
+    it("rejects a malformed date with 400 VALIDATION_ERROR", async () => {
+      const agent = request.agent(app);
+      await agent.post("/auth/signup").send(buildSignupPayload());
+
+      const res = await agent.get("/planning").query({ date: "not-a-date" });
+
+      expect(res.status).to.equal(400);
+      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
+    });
+
+    it("rejects a date shaped right but calendarially impossible with 400 VALIDATION_ERROR", async () => {
+      const agent = request.agent(app);
+      await agent.post("/auth/signup").send(buildSignupPayload());
+
+      const res = await agent.get("/planning").query({ date: "2026-02-30" });
+
+      expect(res.status).to.equal(400);
+      expect(res.body.code).to.equal(ErrorCode.VALIDATION_ERROR);
+    });
+
+    it("returns null when the household has no planning covering that date", async () => {
+      const agent = request.agent(app);
+      await agent.post("/auth/signup").send(buildSignupPayload());
+
+      const res = await agent.get("/planning").query({ date: today() });
 
       expect(res.status).to.equal(200);
       expect(res.body).to.equal(null);
     });
 
-    it("returns the household's planning covering today, with recipes resolved", async () => {
+    it("returns the household's planning covering that date, with recipes resolved", async () => {
       const agent = request.agent(app);
       await agent.post("/auth/signup").send(buildSignupPayload());
       const houseRes = await agent.post("/house").send({ name: "Chez moi" });
       const houseId: number = houseRes.body.id;
 
       const recipe = await prisma.recipe.create({ data: { name: "Ratatouille" } });
-      const today = new Date();
+      const now = new Date();
       const planning = await prisma.planning.create({
         data: {
           houseId,
           startDate: new Date(
-            Date.UTC(today.getUTCFullYear(), today.getUTCMonth(), today.getUTCDate() - 2),
+            Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate() - 2),
           ),
           finishDate: new Date(
-            Date.UTC(today.getUTCFullYear(), today.getUTCMonth(), today.getUTCDate() + 2),
+            Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate() + 2),
           ),
         },
       });
       await prisma.planningItem.create({
-        data: { planningId: planning.id, weekDay: "monday", meal: "dinner", recipeId: recipe.id },
+        data: { planningId: planning.id, weekDay: "lundi", meal: "diner", recipeId: recipe.id },
       });
 
-      const res = await agent.get("/planning/current");
+      const res = await agent.get("/planning").query({ date: today() });
 
       expect(res.status).to.equal(200);
       expect(res.body.id).to.equal(planning.id);
       expect(res.body.items).to.have.length(1);
-      expect(res.body.items[0]).to.include({ weekDay: "monday", meal: "dinner" });
+      expect(res.body.items[0]).to.include({ weekDay: "lundi", meal: "diner" });
       expect(res.body.items[0].recipe).to.include({ id: recipe.id, name: "Ratatouille" });
     });
 
-    it("returns null when the household's planning does not cover today", async () => {
+    it("returns null when the household's planning does not cover that date", async () => {
       const agent = request.agent(app);
       await agent.post("/auth/signup").send(buildSignupPayload());
       const houseRes = await agent.post("/house").send({ name: "Chez moi" });
       const houseId: number = houseRes.body.id;
 
-      // A planning entirely in the past — shouldn't be picked up as "current".
+      // A planning entirely in the past — shouldn't be picked up for today.
       await prisma.planning.create({
         data: {
           houseId,
@@ -94,10 +137,38 @@ describe("Planning", () => {
         },
       });
 
-      const res = await agent.get("/planning/current");
+      const res = await agent.get("/planning").query({ date: today() });
 
       expect(res.status).to.equal(200);
       expect(res.body).to.equal(null);
     });
+
+    it("returns a different week's planning when asked for a date outside the current one", async () => {
+      const agent = request.agent(app);
+      await agent.post("/auth/signup").send(buildSignupPayload());
+      const houseRes = await agent.post("/house").send({ name: "Chez moi" });
+      const houseId: number = houseRes.body.id;
+
+      const recipe = await prisma.recipe.create({ data: { name: "Curry de lentilles" } });
+      const nextWeek = DateTime.utc().plus({ weeks: 1 });
+      const planning = await prisma.planning.create({
+        data: {
+          houseId,
+          startDate: nextWeek.startOf("week").toJSDate(),
+          finishDate: nextWeek.endOf("week").startOf("day").toJSDate(),
+        },
+      });
+      await prisma.planningItem.create({
+        data: { planningId: planning.id, weekDay: "mardi", meal: "dejeuner", recipeId: recipe.id },
+      });
+
+      const res = await agent.get("/planning").query({ date: isoDate(nextWeek) });
+
+      expect(res.status).to.equal(200);
+      expect(res.body.id).to.equal(planning.id);
+
+      const thisWeekRes = await agent.get("/planning").query({ date: today() });
+      expect(thisWeekRes.body).to.equal(null);
+    });
   });
 });