Add createdAt time for signInWithIdp new users

CHANGELOG.md

@@ -1,2 +1,3 @@
 - Fix bug where disabling background triggers did nothing. (#5221)
 - Fix bug in auth emulator where empty string should throw invalid email instead of missing email. (#3898)
+- Fix bug in auth emulator in which createdAt was not set for signInWithIdp new users. (#5203)

src/emulator/auth/operations.ts

@@ -1608,9 +1608,11 @@ async function signInWithIdp(
     oauthExpiresIn: coercePrimitiveToString(response.oauthExpireIn),
   };
   if (response.isNewUser) {
+    const timestamp = new Date();
     let updates: Partial<UserInfo> = {
       ...accountUpdates.fields,
-      lastLoginAt: Date.now().toString(),
+      createdAt: timestamp.getTime().toString(),
+      lastLoginAt: timestamp.getTime().toString(),
       providerUserInfo: [providerUserInfo],
       tenantId: state instanceof TenantProjectState ? state.tenantId : undefined,
     };