diff --git a/src/integrations/intercom/serializers/intercom-attributes.js b/src/integrations/intercom/serializers/intercom-attributes.js
index 86bf89631..177a87fb6 100644
--- a/src/integrations/intercom/serializers/intercom-attributes.js
+++ b/src/integrations/intercom/serializers/intercom-attributes.js
@@ -3,6 +3,17 @@ const JSONAPISerializer = require('jsonapi-serializer').Serializer;
 function serializeIntercomAttributes(attributes, collectionName, meta) {
   const type = `${collectionName}_intercom_attributes`;
 
+  const unixTimestampToDateOrNull = (unixTimestamp) =>
+    unixTimestamp && new Date(unixTimestamp * 1000);
+
+  // Attributes keys ending with `_at` are unix timestamp
+  // thus they need to be converted to js Date
+  Object.entries(attributes).forEach(([attributeKey, attributeValue]) => {
+    if (attributeKey.endsWith('_at')) {
+      attributes[attributeKey] = unixTimestampToDateOrNull(attributeValue);
+    }
+  });
+
   return new JSONAPISerializer(type, attributes, {
     attributes: [
       'email',
diff --git a/test/integrations/intercom/serializers/intercom-attributes.test.js b/test/integrations/intercom/serializers/intercom-attributes.test.js
new file mode 100644
index 000000000..32bb8c717
--- /dev/null
+++ b/test/integrations/intercom/serializers/intercom-attributes.test.js
@@ -0,0 +1,125 @@
+const serializeAttributes = require('../../../../src/integrations/intercom/serializers/intercom-attributes');
+
+describe('integrations > intercom > serializers > intercom-attributes', () => {
+  describe('on an empty object', () => {
+    it('should return a JSONAPI version of the empty object', () => {
+      expect.assertions(1);
+
+      const serializedIntercomAttributes = serializeAttributes({}, 'x', {});
+
+      expect(serializedIntercomAttributes).toStrictEqual({
+        data: {
+          type: 'x_intercom_attributes',
+        },
+        meta: {},
+      });
+    });
+  });
+
+  describe('with a classic intercom payload', () => {
+    it('should format the intercom response as JSONAPI', () => {
+      expect.assertions(1);
+
+      // Most of theses fields are "useless", but this is the look of
+      // a response sent by intercom/services/attributes-getter.js
+      const intercomAttributes = {
+        type: 'contact',
+        id: 'id',
+        workspace_id: 'workspace_id',
+        external_id: null,
+        role: 'user',
+        email: 'test@test.fr',
+        phone: null,
+        name: 'Username 1',
+        avatar: null,
+        owner_id: null,
+        social_profiles: { type: 'list', data: [] },
+        has_hard_bounced: false,
+        marked_email_as_spam: false,
+        unsubscribed_from_emails: false,
+        created_at: null,
+        updated_at: null,
+        signed_up_at: null,
+        last_seen_at: null,
+        last_replied_at: null,
+        last_contacted_at: null,
+        last_email_opened_at: null,
+        last_email_clicked_at: null,
+        language_override: null,
+        browser: null,
+        browser_version: null,
+        browser_language: null,
+        os: null,
+        location: {
+          type: 'location',
+          country: null,
+          region: null,
+          city: null,
+        },
+        android_app_name: null,
+        android_app_version: null,
+        android_device: null,
+        android_os_version: null,
+        android_sdk_version: null,
+        android_last_seen_at: null,
+        ios_app_name: null,
+        ios_app_version: null,
+        ios_device: null,
+        ios_os_version: null,
+        ios_sdk_version: null,
+        ios_last_seen_at: null,
+        custom_attributes: {},
+        city: null,
+        country: null,
+      };
+
+      const serializedIntercomAttributes = serializeAttributes(intercomAttributes, 'x', {});
+
+      expect(serializedIntercomAttributes).toStrictEqual({
+        data: {
+          type: 'x_intercom_attributes',
+          attributes: {
+            browser: null,
+            city: null,
+            country: null,
+            created_at: null,
+            email: 'test@test.fr',
+            last_contacted_at: null,
+            last_email_clicked_at: null,
+            last_email_opened_at: null,
+            last_replied_at: null,
+            last_seen_at: null,
+            name: 'Username 1',
+            role: 'user',
+            signed_up_at: null,
+            updated_at: null,
+          },
+          id: 'id',
+        },
+        meta: {},
+      });
+    });
+
+    describe('when there are dates in the response', () => {
+      it('should correctly format the date from unix timestamp', () => {
+        expect.assertions(6);
+
+        const intercomAttributes = {
+          updated_at: null,
+          created_at: 1586853350,
+          email: 'test@test.fr',
+        };
+        const serializedIntercomAttributes = serializeAttributes(intercomAttributes, 'x', {});
+
+        expect(serializedIntercomAttributes).toBeDefined();
+        expect(serializedIntercomAttributes.data).toBeDefined();
+        const serializedAttributes = serializedIntercomAttributes.data.attributes;
+        expect(serializedAttributes).toBeDefined();
+        expect(serializedAttributes.updated_at).toBeNull();
+        expect(serializedAttributes.created_at).toStrictEqual(new Date(1586853350000));
+        expect(serializedAttributes.email)
+          .toStrictEqual(intercomAttributes.email);
+      });
+    });
+  });
+});