How to validate date in Laravel?

Create a new custom validation rule class and in the passes method, check if a Salary already exists between the given dates. https://laravel.com/docs/8.x/validation#custom-validation-rules

not all business logic can be expressed as validation rules.

@snapey i don't want user to create salary if the salary is already created between these two dates.

Yes, so you don't need it as a validation rule. Validation is just to stop hackers from abusing input, as well as checking if the information coming in is correct type.

You would do something like such:

class SalaryController  extends Controller {

		public function store(Request $request)
		{
				// Run validation on $request here


				$employee = Employee::find($request->employee_id);
				
				if ($request->salary_date !>  $employee->salary->created_on->latest() && $request->salary_date + 30 !<  $employee->salary->end_on->latest())
				{
						$ns= new Salary;
						$ns->employee_id = $employee->id;
						$ns->amount = $request->amount;
						$ns->created_on = now();
						$ns->end_on = now() + 30;

						return "Success!";
				}
				else
				{
								return "Error!";
				}
		}

}

Okay, this won't actually run, but I hope it will help.

if you want help with code you are going to need to show how you store this data

@swapnilmanew just reproduced it, for the sake of writing an article about it.

New validation rule:

php artisan make:rule UniqueSalaryRule --invokable

Then inside that class:

use App\Models\Salary;
use Illuminate\Contracts\Validation\DataAwareRule;
use Illuminate\Contracts\Validation\InvokableRule;

class UniqueSalaryRule implements DataAwareRule, InvokableRule
{
    protected $data = [];

    public function __invoke($attribute, $value, $fail)
    {
        if (Salary::where('user_id', $this->data['user_id'])
            ->where('date_from', '<=', $value)
            ->Where('date_to', '>=', $this->data['date_to'])
            ->exists()) {
            $fail('Salary for this period already exists');
        }
    }

    public function setData($data)
    {
        $this->data = $data;

        return $this;
    }
}

And then use that rule in Form Request validation:

class StoreSalaryRequest extends FormRequest
{
    public function rules()
    {
        return [
            'user_id' => 'required',
            'date_from' => ['required', new UniqueSalaryRule()],
            'date_to' => 'required',
            'amount' => 'required',
        ];
    }
}

That worked for my Laravel 9, with new custom rule syntax, read the docs on how to do it with the older syntax.

Inside that custom rule, you need the data from other validation request, so read more about it here: https://laravel.com/docs/9.x/validation#using-rule-objects