Laravel 5 how relation two fields, date and time in a query with where

I have two fields in a table: date and time, and I want to show all items with this conditions:

 $now = date('Y-m-d');
 $time = date('H:i:s');

 $news = News::where('date', '<=', $now)->where('time', '<=', $time)->where('active', '1')->orderBy('date', 'desc')->orderBy('time', 'desc')->get();

And I want to condition the time to the date. I mean that if the date is less than today then the time does not have to affect.

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