Add published on field

apps/codeforafrica/src/payload/fields/publishedOn.js

@@ -0,0 +1,22 @@
+import { deepmerge } from "@mui/utils";
+
+const publishedOn = (overrides) =>
+  deepmerge(
+    {
+      name: "publishedOn",
+      type: "date",
+      required: true,
+      hooks: {
+        beforeValidate: [({ value }) => (value ? new Date(value) : new Date())],
+      },
+      admin: {
+        date: {
+          pickerAppearance: "dayAndTime",
+        },
+        position: "sidebar",
+      },
+    },
+    overrides,
+  );
+
+export default publishedOn;