cannot user where in eloquent

I'm using Eloquent ORM in laravel. there is 2 model, User and Trans. User hasMany Trans, and Trans belongsTo User. The problem is when i'm using query where, it doesnt work

i tried using ->get() in the last code, it still doesnt work. i tried using ->all() in the last code it still doesnt work. i tried whereIn, it still doesnt work

Model User

public function trans(){
        return $this->hasMany('App\Trans', 'user_id');
    }

Model trans

public function user ()
    {
        return $this->belongsTo('App\User','user_id');
    }

Controller

$trans = Auth::user()->trans->where('date', $date);

I want the output is based on query where the date is based on user input, when i delete ->where , it works and the output like this

Collection {#797 ▼
  #items: array:13 [▼
    0 => Trans {#783 ▶}
    1 => Trans {#784 ▶}
    2 => Trans {#785 ▶}
    3 => Trans {#786 ▶}
  ]
}

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