diff --git a/packages/javascript-api/src/lib/model/day-opening-hours.ts b/packages/javascript-api/src/lib/model/day-opening-hours.ts
new file mode 100644
index 00000000..48a392e1
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/day-opening-hours.ts
@@ -0,0 +1,9 @@
+import { OpeningHoursRange } from './opening-hours-range.js';
+
+/**
+ * `businessHours` and `closed` are mutually exclusive. Neither means open all day.
+ */
+export type DayOpeningHours =
+  | { businessHours: OpeningHoursRange[]; closed?: undefined }
+  | { closed: true; businessHours?: undefined }
+  | Record<string, never>;
diff --git a/packages/javascript-api/src/lib/model/opening-hours-exception.ts b/packages/javascript-api/src/lib/model/opening-hours-exception.ts
new file mode 100644
index 00000000..46af69d4
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/opening-hours-exception.ts
@@ -0,0 +1,18 @@
+import { OpeningHoursRange } from './opening-hours-range.js';
+
+interface OpeningHoursExceptionBase {
+  /** ISO date string, e.g. "2020-05-13" */
+  date: string;
+  /** Max 30 characters */
+  closedReason?: string;
+}
+
+/**
+ * Requires exactly one of `closed` or `businessHours`.
+ */
+export type OpeningHoursException =
+  | (OpeningHoursExceptionBase & { closed: true; businessHours?: undefined })
+  | (OpeningHoursExceptionBase & {
+      businessHours: OpeningHoursRange[];
+      closed?: undefined;
+    });
diff --git a/packages/javascript-api/src/lib/model/opening-hours-range.ts b/packages/javascript-api/src/lib/model/opening-hours-range.ts
new file mode 100644
index 00000000..88418ee3
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/opening-hours-range.ts
@@ -0,0 +1,6 @@
+import { OpeningHoursTime } from './opening-hours-time.js';
+
+export interface OpeningHoursRange {
+  opens: OpeningHoursTime;
+  closes: OpeningHoursTime;
+}
diff --git a/packages/javascript-api/src/lib/model/opening-hours-time.ts b/packages/javascript-api/src/lib/model/opening-hours-time.ts
new file mode 100644
index 00000000..0c364479
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/opening-hours-time.ts
@@ -0,0 +1,4 @@
+export interface OpeningHoursTime {
+  hours: number;
+  minutes: number;
+}
diff --git a/packages/javascript-api/src/lib/model/opening-hours.ts b/packages/javascript-api/src/lib/model/opening-hours.ts
new file mode 100644
index 00000000..eb5c4eac
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/opening-hours.ts
@@ -0,0 +1,11 @@
+import { DayOpeningHours } from './day-opening-hours.js';
+
+export interface OpeningHours {
+  mon: DayOpeningHours;
+  tue: DayOpeningHours;
+  wed: DayOpeningHours;
+  thu: DayOpeningHours;
+  fri: DayOpeningHours;
+  sat: DayOpeningHours;
+  sun: DayOpeningHours;
+}
diff --git a/packages/javascript-api/src/lib/services/location/location.service.spec.ts b/packages/javascript-api/src/lib/services/location/location.service.spec.ts
index d5f3b85c..e069834c 100644
--- a/packages/javascript-api/src/lib/services/location/location.service.spec.ts
+++ b/packages/javascript-api/src/lib/services/location/location.service.spec.ts
@@ -147,6 +147,84 @@ describe('Location service', function () {
     });
   });
 
+  describe('setOpeningHours()', function () {
+    const OPENING_HOURS = {
+      mon: {
+        businessHours: [
+          {
+            opens: { hours: 9, minutes: 0 },
+            closes: { hours: 17, minutes: 30 },
+          },
+        ],
+      },
+      tue: {
+        businessHours: [
+          {
+            opens: { hours: 9, minutes: 0 },
+            closes: { hours: 17, minutes: 30 },
+          },
+        ],
+      },
+      wed: {},
+      thu: {},
+      fri: {},
+      sat: { closed: true as const },
+      sun: { closed: true as const },
+    };
+
+    beforeEach(function () {
+      requestStub
+        .withArgs(`locations/${LOCATION_ID}/opening-hours`)
+        .resolves({});
+    });
+
+    it('calls ApiBase.request with correct URL, method, body and headers', async function () {
+      await LocationService.setOpeningHours(LOCATION_ID, OPENING_HOURS);
+      expect(
+        requestStub.calledWith(`locations/${LOCATION_ID}/opening-hours`, {
+          method: 'PUT',
+          body: JSON.stringify(OPENING_HOURS),
+          headers: { 'X-Qminder-API-Version': '2020-09-01' },
+        }),
+      ).toBeTruthy();
+    });
+  });
+
+  describe('setOpeningHoursExceptions()', function () {
+    const EXCEPTIONS = [
+      { date: '2020-05-13', closed: true as const, closedReason: 'Birthday' },
+      {
+        date: '2020-12-25',
+        businessHours: [
+          {
+            opens: { hours: 10, minutes: 0 },
+            closes: { hours: 14, minutes: 0 },
+          },
+        ],
+      },
+    ];
+
+    beforeEach(function () {
+      requestStub
+        .withArgs(`locations/${LOCATION_ID}/opening-hours/exceptions`)
+        .resolves({});
+    });
+
+    it('calls ApiBase.request with correct URL, method, body and headers', async function () {
+      await LocationService.setOpeningHoursExceptions(LOCATION_ID, EXCEPTIONS);
+      expect(
+        requestStub.calledWith(
+          `locations/${LOCATION_ID}/opening-hours/exceptions`,
+          {
+            method: 'PUT',
+            body: JSON.stringify(EXCEPTIONS),
+            headers: { 'X-Qminder-API-Version': '2020-09-01' },
+          },
+        ),
+      ).toBeTruthy();
+    });
+  });
+
   afterEach(function () {
     requestStub.restore();
   });
diff --git a/packages/javascript-api/src/lib/services/location/location.service.ts b/packages/javascript-api/src/lib/services/location/location.service.ts
index a18abc11..5f19e679 100644
--- a/packages/javascript-api/src/lib/services/location/location.service.ts
+++ b/packages/javascript-api/src/lib/services/location/location.service.ts
@@ -1,4 +1,10 @@
-import { details, getDesks, list } from './location.js';
+import {
+  details,
+  getDesks,
+  list,
+  setOpeningHours,
+  setOpeningHoursExceptions,
+} from './location.js';
 
 /**
  * The LocationService allows you to get data about Locations.
@@ -74,4 +80,18 @@ export const LocationService = {
    * @returns a Promise that resolves to the list of desks in this location
    */
   getDesks,
+
+  /**
+   * Set the weekly opening hours for a location.
+   *
+   * Calls the following HTTP API: `PUT /locations/<ID>/opening-hours`
+   */
+  setOpeningHours,
+
+  /**
+   * Set date-specific exceptions to the regular opening hours schedule.
+   *
+   * Calls the following HTTP API: `PUT /locations/<ID>/opening-hours/exceptions`
+   */
+  setOpeningHoursExceptions,
 };
diff --git a/packages/javascript-api/src/lib/services/location/location.ts b/packages/javascript-api/src/lib/services/location/location.ts
index 313c7128..f09cac66 100644
--- a/packages/javascript-api/src/lib/services/location/location.ts
+++ b/packages/javascript-api/src/lib/services/location/location.ts
@@ -1,8 +1,12 @@
 import { Desk } from '../../model/desk.js';
 import { Location } from '../../model/location.js';
+import { OpeningHours } from '../../model/opening-hours.js';
+import { OpeningHoursException } from '../../model/opening-hours-exception.js';
 import { extractId, IdOrObject } from '../../util/id-or-object.js';
 import { ApiBase } from '../api-base/api-base.js';
 
+const V2_HEADERS = { 'X-Qminder-API-Version': '2020-09-01' } as const;
+
 export function list(): Promise<Location[]> {
   return ApiBase.request('v1/locations/').then(
     (locations: { data: Location[] }) => {
@@ -27,3 +31,27 @@ export function getDesks(location: IdOrObject<Location>): Promise<Desk[]> {
     },
   );
 }
+
+export async function setOpeningHours(
+  location: IdOrObject<Location>,
+  openingHours: OpeningHours,
+): Promise<void> {
+  const locationId = extractId(location);
+  await ApiBase.request(`locations/${locationId}/opening-hours`, {
+    method: 'PUT',
+    body: JSON.stringify(openingHours),
+    headers: V2_HEADERS,
+  });
+}
+
+export async function setOpeningHoursExceptions(
+  location: IdOrObject<Location>,
+  exceptions: OpeningHoursException[],
+): Promise<void> {
+  const locationId = extractId(location);
+  await ApiBase.request(`locations/${locationId}/opening-hours/exceptions`, {
+    method: 'PUT',
+    body: JSON.stringify(exceptions),
+    headers: V2_HEADERS,
+  });
+}
diff --git a/packages/javascript-api/src/public-api/model.ts b/packages/javascript-api/src/public-api/model.ts
index 282b2f95..95e1f81b 100644
--- a/packages/javascript-api/src/public-api/model.ts
+++ b/packages/javascript-api/src/public-api/model.ts
@@ -14,6 +14,11 @@ export { TicketExtraText } from '../lib/model/ticket/ticket-extra-text.js';
 export { TicketExtraUrl } from '../lib/model/ticket/ticket-extra-url.js';
 export { TicketExtraOption } from '../lib/model/ticket/ticket-extra-option.js';
 export { User } from '../lib/model/user.js';
+export { DayOpeningHours } from '../lib/model/day-opening-hours.js';
+export { OpeningHours } from '../lib/model/opening-hours.js';
+export { OpeningHoursException } from '../lib/model/opening-hours-exception.js';
+export { OpeningHoursRange } from '../lib/model/opening-hours-range.js';
+export { OpeningHoursTime } from '../lib/model/opening-hours-time.js';
 export { Webhook } from '../lib/model/webhook.js';
 export { SimpleError } from '../lib/model/errors/simple-error.js';
 export { ComplexError } from '../lib/model/errors/complex-error.js';