Route model Binding, question?

Good afternoon everyone,

I need your help, I have a project I use route model binding but I don't have any idea how able to add a value from a variable and save it with all properties. because I need to calculate the different days between on two dates.

Component Class livewire

<?php

namespace App\Http\Livewire\Logs;

use Illuminate\Support\Str;
use App\Models\Log;
use App\Models\Projectstage;
use App\Models\Sdi;
use Carbon\Carbon;
use Illuminate\Validation\Rule;
use Livewire\Component;

class LogForm extends Component
{

/** public Log $log;  **/

    public $sdi;
    public $jobname; 
    public $slug;
    public $projectstage;
    public $takeoffby;
    public $biddate;
    public $notes; 
/** replace this for Log $log **/

    public function mount(Log $log)
    {
        $this->log = $log;
    }

    public function rules():array
    {
        return [
            'sdi' => ['required'],
            'jobname' => ['required',
                Rule::unique('logs','job_name')
            ],
            'slug' => ['required','alpha_dash',
                Rule::unique('logs','slug')
            ],
            'projectstage' => ['required'],
            'takeoffby' => ['required','max:3'],
            'biddate' => ['required'],
            'notes' => ['nullable']
        ];
    }

    protected $validationAttributes = [
        'sdi' => 'SDI',
        'jobname' => 'Job Name',
        'slug' => 'Slug',
        'projectstage' => 'Project Stage',
        'takeoffby' => 'TakeOff By',
        'biddate' => 'Bid Date'
    ];
    
    public function updated($propertyName)
    {
        $this->validateOnly($propertyName);
    }

    public function updatedjobname($jobname)
    {
        $this->slug = Str::slug($jobname);
    }

    public function save()
    {
        $this->validate();

         /*** Wiht out Carbon caculate between two or more days***/

        $tody =date('Y-m-d H:i'); //2022-08-04 9:55
        $datetime1 =strtotime($tody);
        $datetime2 = strtotime($this->biddate); //2022-08-06 9:55
        $differentInDays = (int)round(($datetime2 - $datetime1)/86400);
       /*  dd($differentInDays);//result: 2 */
        
        /*** Wiht Carbon using  diff method ***/
        /* 
        $to = Carbon::now();//2022-08-04 9:55
        $from = Carbon::parse($this->biddate);//2022-08-06 9:55
        //$days = $to->diffInDays($from);
        $days = Carbon::make($to)->diffInDays($from);
        dd($days, $to->toIso8601String(), $from->toIso8601String()); //result: ^ 1  ^ "2022-08-04T13:10:08-07:00"  ^ "2022-08-06T13:05:00-07:00" 
        */

        $log = new Log;
        $log->sdi = $this->sdi;
        $log->job_name = $this->jobname;
        $log->slug = $this->slug;
        $log->project_stage = $this->projectstage;
        $log->takeoff_by = $this->takeoffby;
        $log->bid_date = $this->biddate;
        $log->days_left = $differentInDays; //here save the between two dates
        $log->notes = $this->notes;
        $log->save();
        /* $this->log->save(); */

        session()->flash('status',__('Project save.'));

        $this->redirectRoute('logs');

    }

    public function render()
    {
        $sdis = Sdi::all();
        $projectstages = Projectstage::all();

        return view('livewire.logs.log-form',compact('sdis','projectstages'));
    }
}

View Livewire

<div>
    <h1>Form New Log</h1>
    <a href="{{ route('logs') }}">Regresar</a>

    <form wire:submit.prevent='save'>
        @csrf
        <label for="">SDI:
            <select wire:model="sdi" name="" id="">
                <option value=""></option>
                @foreach ($sdis as $sdi)
                    <option value="{{ $sdi->short_name }}">{{ $sdi->short_name }}</option>
                @endforeach
            </select>
            @error('sdi')
                    <div class="">{{ $message }}</div>
            @enderror
        </label>
        <br />

        <label for="">Job Name:
            <input wire:model="jobname" type="text" placeholder="Job Name">
            @error('jobname')
                <div class="">{{ $message }}</div>
            @enderror
        </label>
        <br />
        
        <label for="">Slug:
            <input wire:model="slug" type="text" placeholder="Freandly url">
            @error('slug')
                <div class="">{{ $message }}</div>
            @enderror
        </label>
        <br />

        <label for="">Project Stage
            <select wire:model="projectstage" name="" id="">
                <option value=""></option>
                @foreach ($projectstages as $projectstage)
                    <option value="{{ $projectstage->name_stage }}">{{ $projectstage->name_stage }}</option>
                @endforeach
            </select>
            @error('projectstage')
                <div class="">{{ $message }}</div>
            @enderror
        </label>
        <br />
        <label for="">TakeOff By:
            <input wire:model="takeoffby" type="text" name="" id="" placeholder="TakeOff By">
            @error('takeoffby')
                <div class="">{{ $message }}</div>
            @enderror
        </label>
        {{-- <br />
        <label for="">Date Completed:
            <input wire:model="datecompleted" type="datetime-local" name="" id="" >
        </label> 
        <br />
        <label for="">Estimator:
            <input wire:model="estimator" type="text" name="" id="" placeholder="Estimator">
        </label>
        --}}
        <br />
        <label for="">Bid Date:
            <input wire:model="biddate" type="datetime-local" name="" id="">
            @error('biddate')
                <div class="">{{ $message }}</div>
            @enderror
        </label>
        <br />
        <label for="">Notes:
            <textarea wire:model="notes" name="" id="" cols="30" rows="10" placeholder="Notes"></textarea>
            @error('notes')
                <div class="">{{ $message }}</div>
            @enderror
        </label>
        <br />
        <input type="submit" value="Guardar"> <a href="{{ route('logs') }}" class="">Cancelar</a> 
    </form>
</div>