diff --git a/src/__tests__/pages/api/dataSources/personnel.test.ts b/src/__tests__/pages/api/dataSources/personnel.test.ts
index 9a80827ff..0040c4bcb 100644
--- a/src/__tests__/pages/api/dataSources/personnel.test.ts
+++ b/src/__tests__/pages/api/dataSources/personnel.test.ts
@@ -22,6 +22,8 @@ const mockData = {
   lastModifiedAt: '2021-10-01',
 }
 
+const mockLastModifiedAt = '2021-10-01'
+
 describe('Personnel API', () => {
   describe('getUserData', () => {
     test('call getUserData with an id', async () => {
@@ -31,7 +33,7 @@ describe('Personnel API', () => {
       personnelAPI.baseURL = 'https://example.com'
 
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      const mockPost = jest.spyOn(PersonnelAPI.prototype as any, 'post');
+      const mockPost = jest.spyOn(PersonnelAPI.prototype as any, 'post')
       mockPost.mockResolvedValue({ data: mockData })
 
       const result = await personnelAPI.getUserData('1234567890')
@@ -59,7 +61,7 @@ describe('Personnel API', () => {
       personnelAPI.baseURL = 'https://example.com'
 
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      const mockPost = jest.spyOn(PersonnelAPI.prototype as any, 'post');
+      const mockPost = jest.spyOn(PersonnelAPI.prototype as any, 'post')
       mockPost.mockResolvedValue({ data: mockData })
 
       const result = await personnelAPI.getGuardianDirectory()
@@ -78,4 +80,60 @@ describe('Personnel API', () => {
       )
     })
   })
+
+  describe('getLastModifiedAt', () => {
+    test('call getLastModifiedAt with an id', async () => {
+      const mockCache = {} as KeyValueCache
+      const personnelAPI = new PersonnelAPI({ cache: mockCache })
+
+      personnelAPI.baseURL = 'https://example.com'
+
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const mockPost = jest.spyOn(PersonnelAPI.prototype as any, 'post')
+      mockPost.mockResolvedValue({ data: mockLastModifiedAt })
+
+      const result = await personnelAPI.getLastModifiedAt()
+
+      expect(result).toEqual({ data: mockLastModifiedAt })
+    })
+
+    test('throw an error when there is no baseURL', async () => {
+      const mockCache = {} as KeyValueCache
+      const personnelAPI = new PersonnelAPI({ cache: mockCache })
+
+      personnelAPI.baseURL = ''
+
+      await expect(personnelAPI.getLastModifiedAt()).rejects.toThrow(
+        'No Personnel API URL found'
+      )
+    })
+  })
+
+  describe('searchGuardianDirectory', () => {
+    test('call searchGuardianDirectory with an id', async () => {
+      const mockCache = {} as KeyValueCache
+      const personnelAPI = new PersonnelAPI({ cache: mockCache })
+
+      personnelAPI.baseURL = 'https://example.com'
+
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const mockPost = jest.spyOn(PersonnelAPI.prototype as any, 'post')
+      mockPost.mockResolvedValue({ data: mockData })
+
+      const result = await personnelAPI.searchGuardianDirectory('1234567890')
+
+      expect(result).toEqual({ data: mockData })
+    })
+
+    test('throw an error when there is no baseURL', async () => {
+      const mockCache = {} as KeyValueCache
+      const personnelAPI = new PersonnelAPI({ cache: mockCache })
+
+      personnelAPI.baseURL = ''
+
+      await expect(
+        personnelAPI.searchGuardianDirectory('1234567890')
+      ).rejects.toThrow('No Personnel API URL found')
+    })
+  })
 })
diff --git a/src/operations/portal/queries/getLastModifiedAt.graphql b/src/operations/portal/queries/getLastModifiedAt.graphql
new file mode 100644
index 000000000..f2b4b5a6b
--- /dev/null
+++ b/src/operations/portal/queries/getLastModifiedAt.graphql
@@ -0,0 +1,3 @@
+query getLastModifiedAt {
+  getLastModifiedAt
+}
diff --git a/src/pages/api/dataSources/personnel.ts b/src/pages/api/dataSources/personnel.ts
index d229eebc3..30b3f575a 100644
--- a/src/pages/api/dataSources/personnel.ts
+++ b/src/pages/api/dataSources/personnel.ts
@@ -32,6 +32,16 @@ class PersonnelAPI extends RESTDataSource {
     })
   }
 
+  async getLastModifiedAt() {
+    if (!this.baseURL) throw new Error('No Personnel API URL found')
+
+    return this.post(this.baseURL + `/api/graphql`, {
+      body: {
+        query: getLastModifiedAtQuery,
+      },
+    })
+  }
+
   async searchGuardianDirectory(query: string) {
     if (!this.baseURL) throw new Error('No Personnel API URL found')
 
@@ -92,6 +102,12 @@ query GetGuardianDirectory {
 }
 `
 
+const getLastModifiedAtQuery = `
+query GetLastModifiedAt {
+  getLastModifiedAt
+}
+`
+
 const searchGuardianDirectoryQuery = `
 query SearchGuardianDirectory($search: String!) {
   searchGuardianDirectory(search: $search) {
diff --git a/src/pages/guardian-directory.tsx b/src/pages/guardian-directory.tsx
index b6418cc47..746cf6ead 100644
--- a/src/pages/guardian-directory.tsx
+++ b/src/pages/guardian-directory.tsx
@@ -9,6 +9,7 @@ import styles from 'styles/pages/guardianDirectory.module.scss'
 import { GuardianDirectoryTable } from 'components/GuardianDirectoryTable/GuardianDirectoryTable'
 import { useGetGuardianDirectoryQuery } from 'operations/portal/queries/getGuardianDirectory.g'
 import { useSearchGuardianDirectoryQuery } from 'operations/portal/queries/searchGuardianDirectory.g'
+import { useGetLastModifiedAtQuery } from 'operations/portal/queries/getLastModifiedAt.g'
 import { GuardianDirectory as GuardianDirectoryType } from 'types'
 
 const GuardianDirectory = () => {
@@ -17,6 +18,7 @@ const GuardianDirectory = () => {
   const { loading } = useUser()
   const [directory, setDirectory] = useState(Array<GuardianDirectoryType>)
   const { data } = useGetGuardianDirectoryQuery()
+  const { data: lastModifiedAt } = useGetLastModifiedAtQuery()
 
   const [searchQuery, setSearchQuery] = useState('')
   const { data: searchData, loading: loadingSearch } =
@@ -108,6 +110,15 @@ const GuardianDirectory = () => {
             rows={directory}
           />
         )}
+
+        <p>
+          Last updated:{' '}
+          {lastModifiedAt?.getLastModifiedAt &&
+            new Date(lastModifiedAt.getLastModifiedAt).toLocaleDateString(
+              'en-US',
+              { year: 'numeric', month: 'short', day: 'numeric' }
+            )}
+        </p>
       </div>
     </>
   )
diff --git a/src/resolvers/index.ts b/src/resolvers/index.ts
index c23f63fbd..1d116da2a 100644
--- a/src/resolvers/index.ts
+++ b/src/resolvers/index.ts
@@ -119,6 +119,14 @@ type GetGuardianDirectoryPromise = {
   }
 }
 
+type GetLastModifiedAtPromise = {
+  data: {
+    getLastModifiedAt: {
+      lastModifiedAt: string
+    }
+  }
+}
+
 type SearchGuardianDirectoryPromise = {
   data: {
     searchGuardianDirectory: [
@@ -168,6 +176,7 @@ type PortalUserContext = {
     personnelAPI: {
       getUserData: (dodId: string) => Promise<GetPersonnelDataPromise>
       getGuardianDirectory: () => Promise<GetGuardianDirectoryPromise>
+      getLastModifiedAt: () => Promise<GetLastModifiedAtPromise>
       searchGuardianDirectory: (
         query: string
       ) => Promise<SearchGuardianDirectoryPromise>
@@ -255,6 +264,17 @@ const resolvers = {
 
   // Root resolvers
   Query: {
+    getLastModifiedAt: async (
+      _: undefined,
+      args: undefined,
+      { dataSources }: PortalUserContext
+    ) => {
+      const {
+        data: { getLastModifiedAt },
+      } = await dataSources.personnelAPI.getLastModifiedAt()
+
+      return getLastModifiedAt
+    },
     searchGuardianDirectory: async (
       _: undefined,
       { search }: { search: string },
diff --git a/src/schema.tsx b/src/schema.tsx
index 7322f1fda..495314f6a 100644
--- a/src/schema.tsx
+++ b/src/schema.tsx
@@ -77,6 +77,7 @@ export const typeDefs = gql`
     theme: String!
     personnelData: PersonnelData
     guardianDirectory: [GuardianDirectory]
+    getLastModifiedAt: String
     searchGuardianDirectory(search: String!): [GuardianDirectory]
   }