diff --git a/superset-frontend/spec/javascripts/dashboard/reducers/dashboardState_spec.js b/superset-frontend/spec/javascripts/dashboard/reducers/dashboardState_spec.js
index 8f6de34e1f5..5adf553b508 100644
--- a/superset-frontend/spec/javascripts/dashboard/reducers/dashboardState_spec.js
+++ b/superset-frontend/spec/javascripts/dashboard/reducers/dashboardState_spec.js
@@ -120,14 +120,29 @@ describe('dashboardState reducer', () => {
   });
 
   it('should set unsaved changes, max undo history, and editMode to false on save', () => {
+    const result = dashboardStateReducer(
+      { hasUnsavedChanges: true },
+      { type: ON_SAVE },
+    );
+    expect(result.hasUnsavedChanges).toBe(false);
+    expect(result.maxUndoHistoryExceeded).toBe(false);
+    expect(result.editMode).toBe(false);
+    expect(result.updatedColorScheme).toBe(false);
+  });
+
+  it('should set lastModifiedTime on save', () => {
+    const lastModifiedTime = new Date().getTime() / 1000;
+    dashboardStateReducer(
+      {
+        lastModifiedTime,
+      },
+      {},
+    );
+
     expect(
-      dashboardStateReducer({ hasUnsavedChanges: true }, { type: ON_SAVE }),
-    ).toEqual({
-      hasUnsavedChanges: false,
-      maxUndoHistoryExceeded: false,
-      editMode: false,
-      updatedColorScheme: false,
-    });
+      dashboardStateReducer({ hasUnsavedChanges: true }, { type: ON_SAVE })
+        .lastModifiedTime,
+    ).toBeGreaterThanOrEqual(lastModifiedTime);
   });
 
   it('should clear focused filter field', () => {
diff --git a/superset-frontend/src/dashboard/components/Header.jsx b/superset-frontend/src/dashboard/components/Header.jsx
index dad2f0e9a94..52f0b24c256 100644
--- a/superset-frontend/src/dashboard/components/Header.jsx
+++ b/superset-frontend/src/dashboard/components/Header.jsx
@@ -79,6 +79,7 @@ const propTypes = {
   logEvent: PropTypes.func.isRequired,
   hasUnsavedChanges: PropTypes.bool.isRequired,
   maxUndoHistoryExceeded: PropTypes.bool.isRequired,
+  lastModifiedTime: PropTypes.number.isRequired,
 
   // redux
   onUndo: PropTypes.func.isRequired,
@@ -269,6 +270,7 @@ class Header extends React.PureComponent {
       dashboardInfo,
       refreshFrequency: currentRefreshFrequency,
       shouldPersistRefreshFrequency,
+      lastModifiedTime,
     } = this.props;
 
     const scale = CategoricalColorNamespace.getScale(
@@ -290,7 +292,7 @@ class Header extends React.PureComponent {
       label_colors: labelColors,
       dashboard_title: dashboardTitle,
       refresh_frequency: refreshFrequency,
-      last_modified_time: dashboardInfo.lastModifiedTime,
+      last_modified_time: lastModifiedTime,
     };
 
     // make sure positions data less than DB storage limitation:
@@ -345,6 +347,7 @@ class Header extends React.PureComponent {
       refreshFrequency,
       shouldPersistRefreshFrequency,
       setRefreshFrequency,
+      lastModifiedTime,
     } = this.props;
 
     const userCanEdit = dashboardInfo.dash_edit_perm;
@@ -516,6 +519,7 @@ class Header extends React.PureComponent {
             showPropertiesModal={this.showPropertiesModal}
             refreshLimit={refreshLimit}
             refreshWarning={refreshWarning}
+            lastModifiedTime={lastModifiedTime}
           />
         </div>
       </StyledDashboardHeader>
diff --git a/superset-frontend/src/dashboard/components/HeaderActionsDropdown.jsx b/superset-frontend/src/dashboard/components/HeaderActionsDropdown.jsx
index 33b5236b197..0976a18f640 100644
--- a/superset-frontend/src/dashboard/components/HeaderActionsDropdown.jsx
+++ b/superset-frontend/src/dashboard/components/HeaderActionsDropdown.jsx
@@ -61,6 +61,7 @@ const propTypes = {
   showPropertiesModal: PropTypes.func.isRequired,
   refreshLimit: PropTypes.number,
   refreshWarning: PropTypes.string,
+  lastModifiedTime: PropTypes.number.isRequired,
 };
 
 const defaultProps = {
@@ -138,6 +139,7 @@ class HeaderActionsDropdown extends React.PureComponent {
       isLoading,
       refreshLimit,
       refreshWarning,
+      lastModifiedTime,
     } = this.props;
 
     const emailTitle = t('Superset Dashboard');
@@ -166,6 +168,7 @@ class HeaderActionsDropdown extends React.PureComponent {
               expandedSlices={expandedSlices}
               refreshFrequency={refreshFrequency}
               shouldPersistRefreshFrequency={shouldPersistRefreshFrequency}
+              lastModifiedTime={lastModifiedTime}
               customCss={customCss}
               colorNamespace={colorNamespace}
               colorScheme={colorScheme}
diff --git a/superset-frontend/src/dashboard/components/SaveModal.jsx b/superset-frontend/src/dashboard/components/SaveModal.jsx
index bb4b064c917..40b29c29556 100644
--- a/superset-frontend/src/dashboard/components/SaveModal.jsx
+++ b/superset-frontend/src/dashboard/components/SaveModal.jsx
@@ -44,6 +44,7 @@ const propTypes = {
   isMenuItem: PropTypes.bool,
   canOverwrite: PropTypes.bool.isRequired,
   refreshFrequency: PropTypes.number.isRequired,
+  lastModifiedTime: PropTypes.number.isRequired,
 };
 
 const defaultProps = {
@@ -106,6 +107,7 @@ class SaveModal extends React.PureComponent {
       dashboardId,
       refreshFrequency: currentRefreshFrequency,
       shouldPersistRefreshFrequency,
+      lastModifiedTime,
     } = this.props;
 
     const scale = CategoricalColorNamespace.getScale(
@@ -129,7 +131,7 @@ class SaveModal extends React.PureComponent {
         saveType === SAVE_TYPE_NEWDASHBOARD ? newDashName : dashboardTitle,
       duplicate_slices: this.state.duplicateSlices,
       refresh_frequency: refreshFrequency,
-      last_modified_time: dashboardInfo.lastModifiedTime,
+      last_modified_time: lastModifiedTime,
     };
 
     if (saveType === SAVE_TYPE_NEWDASHBOARD && !newDashName) {
diff --git a/superset-frontend/src/dashboard/containers/DashboardHeader.jsx b/superset-frontend/src/dashboard/containers/DashboardHeader.jsx
index 4bdc24971a0..3fbba7d0137 100644
--- a/superset-frontend/src/dashboard/containers/DashboardHeader.jsx
+++ b/superset-frontend/src/dashboard/containers/DashboardHeader.jsx
@@ -83,6 +83,7 @@ function mapStateToProps({
     isLoading: isDashboardLoading(charts),
     hasUnsavedChanges: !!dashboardState.hasUnsavedChanges,
     maxUndoHistoryExceeded: !!dashboardState.maxUndoHistoryExceeded,
+    lastModifiedTime: dashboardState.lastModifiedTime,
     editMode: !!dashboardState.editMode,
     slug: dashboardInfo.slug,
     metadata: dashboardInfo.metadata,
diff --git a/superset-frontend/src/dashboard/reducers/dashboardState.js b/superset-frontend/src/dashboard/reducers/dashboardState.js
index 1ed24625171..b85df0e90a4 100644
--- a/superset-frontend/src/dashboard/reducers/dashboardState.js
+++ b/superset-frontend/src/dashboard/reducers/dashboardState.js
@@ -106,6 +106,8 @@ export default function dashboardStateReducer(state = {}, action) {
         maxUndoHistoryExceeded: false,
         editMode: false,
         updatedColorScheme: false,
+        // server-side compare last_modified_time in second level
+        lastModifiedTime: new Date().getTime() / 1000,
       };
     },
     [SET_UNSAVED_CHANGES]() {
diff --git a/superset-frontend/src/dashboard/reducers/getInitialState.js b/superset-frontend/src/dashboard/reducers/getInitialState.js
index 3e5b6ea7577..75dccf3b772 100644
--- a/superset-frontend/src/dashboard/reducers/getInitialState.js
+++ b/superset-frontend/src/dashboard/reducers/getInitialState.js
@@ -266,7 +266,6 @@ export default function getInitialState(bootstrapData) {
       id: dashboard.id,
       slug: dashboard.slug,
       metadata: dashboard.metadata,
-      lastModifiedTime: dashboard.last_modified_time,
       userId: user_id,
       dash_edit_perm: dashboard.dash_edit_perm,
       dash_save_perm: dashboard.dash_save_perm,
@@ -301,6 +300,7 @@ export default function getInitialState(bootstrapData) {
       isPublished: dashboard.published,
       hasUnsavedChanges: false,
       maxUndoHistoryExceeded: false,
+      lastModifiedTime: dashboard.last_modified_time,
     },
     dashboardLayout,
     messageToasts: [],