[docs] Use fixed dates for stable CRUD dashboard screenshots (mui#46546)

Author: apedroferreira

docs/data/material/getting-started/templates/crud-dashboard/data/employees.js

@@ -3,23 +3,23 @@ const INITIAL_EMPLOYEES_STORE = [
     id: 1,
     name: 'Edward Perry',
     age: 25,
-    joinDate: new Date().toISOString(),
+    joinDate: '2025-07-16T00:00:00.000Z',
     role: 'Finance',
     isFullTime: true,
   },
   {
     id: 2,
     name: 'Josephine Drake',
     age: 36,
-    joinDate: new Date().toISOString(),
+    joinDate: '2025-07-16T00:00:00.000Z',
     role: 'Market',
     isFullTime: false,
   },
   {
     id: 3,
     name: 'Cody Phillips',
     age: 19,
-    joinDate: new Date().toISOString(),
+    joinDate: '2025-07-16T00:00:00.000Z',
     role: 'Development',
     isFullTime: true,
   },

docs/data/material/getting-started/templates/crud-dashboard/data/employees.ts

@@ -16,23 +16,23 @@ const INITIAL_EMPLOYEES_STORE: Employee[] = [
     id: 1,
     name: 'Edward Perry',
     age: 25,
-    joinDate: new Date().toISOString(),
+    joinDate: '2025-07-16T00:00:00.000Z',
     role: 'Finance',
     isFullTime: true,
   },
   {
     id: 2,
     name: 'Josephine Drake',
     age: 36,
-    joinDate: new Date().toISOString(),
+    joinDate: '2025-07-16T00:00:00.000Z',
     role: 'Market',
     isFullTime: false,
   },
   {
     id: 3,
     name: 'Cody Phillips',
     age: 19,
-    joinDate: new Date().toISOString(),
+    joinDate: '2025-07-16T00:00:00.000Z',
     role: 'Development',
     isFullTime: true,
   },