diff --git a/ckanext/datagov_inventory/plugin.py b/ckanext/datagov_inventory/plugin.py
index 0d0486cc..ad066bac 100644
--- a/ckanext/datagov_inventory/plugin.py
+++ b/ckanext/datagov_inventory/plugin.py
@@ -12,6 +12,7 @@
 from ckanext.datagov_inventory import action
 
 from flask import Blueprint, redirect, session
+from datetime import datetime, timezone
 import logging
 import re
 from urllib.parse import quote
@@ -95,6 +96,7 @@ class Datagov_IauthfunctionsPlugin(plugins.SingletonPlugin):
     plugins.implements(plugins.IActions)
     plugins.implements(plugins.IConfigurer)
     plugins.implements(plugins.IBlueprint)
+    plugins.implements(plugins.IResourceController, inherit=True)
 
     def get_auth_functions(self):
         return {'format_autocomplete': restrict_anon_access,
@@ -128,6 +130,37 @@ def update_config(self, config):
     def get_blueprint(self):
         return pusher
 
+    def after_resource_create(self, context, resource):
+        _touch_dataset_modified(context, resource['package_id'])
+
+    def after_resource_update(self, context, resource):
+        _touch_dataset_modified(context, resource['package_id'])
+
+    def before_resource_delete(self, context, resource, resources):
+        resource_id = resource.get('id')
+        for existing_resource in resources:
+            if existing_resource.get('id') == resource_id:
+                context['datagov_inventory_package_id'] = (
+                    existing_resource['package_id']
+                )
+                break
+
+    def after_resource_delete(self, context, resources):
+        package_id = context.pop('datagov_inventory_package_id', None)
+        if package_id:
+            _touch_dataset_modified(context, package_id)
+
+
+def _touch_dataset_modified(context, package_id):
+    """update dataset exported modified date (for any resource change)."""
+    modified = datetime.now(timezone.utc).isoformat(
+        timespec='milliseconds'
+    ).replace('+00:00', 'Z')
+    toolkit.get_action('package_patch')(
+        context,
+        {'id': package_id, 'modified': modified}
+    )
+
 
 def redirect_homepage():
     if current_user.is_authenticated or g.user:
diff --git a/ckanext/datagov_inventory/tests/test_resource_modified.py b/ckanext/datagov_inventory/tests/test_resource_modified.py
new file mode 100644
index 00000000..9457ce2f
--- /dev/null
+++ b/ckanext/datagov_inventory/tests/test_resource_modified.py
@@ -0,0 +1,79 @@
+from datetime import datetime
+
+import pytest
+
+from ckanext.datagov_inventory import plugin as plugin_module
+
+
+@pytest.fixture
+def plugin():
+    return plugin_module.Datagov_IauthfunctionsPlugin()
+
+
+@pytest.mark.parametrize(
+    'hook_name',
+    ['after_resource_create', 'after_resource_update']
+)
+def test_resource_save_touches_parent_dataset(
+        monkeypatch, plugin, hook_name):
+    # resource creation and updates should use the same parent-touch behavior.
+    touched = []
+    monkeypatch.setattr(
+        plugin_module,
+        '_touch_dataset_modified',
+        lambda context, package_id: touched.append((context, package_id))
+    )
+    context = {'user': 'editor'}
+
+    getattr(plugin, hook_name)(
+        context,
+        {'id': 'resource-id', 'package_id': 'dataset-id'}
+    )
+
+    assert touched == [(context, 'dataset-id')]
+
+
+def test_resource_delete_touches_parent_when_no_resources_remain(
+        monkeypatch, plugin):
+    # package id must survive deletion when the remaining list is empty.
+    touched = []
+    monkeypatch.setattr(
+        plugin_module,
+        '_touch_dataset_modified',
+        lambda context, package_id: touched.append((context, package_id))
+    )
+    context = {'user': 'editor'}
+
+    plugin.before_resource_delete(
+        context,
+        {'id': 'resource-id'},
+        [{'id': 'resource-id', 'package_id': 'dataset-id'}]
+    )
+    plugin.after_resource_delete(context, [])
+
+    assert touched == [(context, 'dataset-id')]
+    assert 'datagov_inventory_package_id' not in context
+
+
+def test_touch_dataset_modified_uses_utc_iso_timestamp(monkeypatch):
+    # data.json exports this custom modified field, so keep its ISO UTC format.
+    calls = []
+
+    def get_action(name):
+        assert name == 'package_patch'
+
+        def action(context, data_dict):
+            calls.append((context, data_dict))
+
+        return action
+
+    monkeypatch.setattr(plugin_module.toolkit, 'get_action', get_action)
+    context = {'user': 'editor'}
+
+    plugin_module._touch_dataset_modified(context, 'dataset-id')
+
+    assert calls[0][0] is context
+    assert calls[0][1]['id'] == 'dataset-id'
+    modified = calls[0][1]['modified']
+    assert modified.endswith('Z')
+    assert datetime.fromisoformat(modified.replace('Z', '+00:00')).tzinfo