Sorry it's a small bug in template, you must to turn on show author also to showing date. If you don't like, you can send your website info. I will fix for you.
I have reconfig so it's shown for now. there is an option when you create menu item so it overwrite the default config value of articles.
You can go to backend->Menus->Main Menu then click to edit Home item. the config option on the right side.