Bisame/bisame/database/seeds/TagTableSeeders.php

<?php

use Illuminate\Database\Seeder;
use Carbon\Carbon;

class TagTableSeeder extends Seeder {

    private function randDate()
	{
		return Carbon::createFromDate(null, rand(1, 12), rand(1, 28));
	}

	public function run()
	{
		DB::table('tags')->delete();
		
		for($i = 0; $i < 20; ++$i)
		{
			$date = $this->randDate();
			DB::table('tags')->insert(array(
					'tag' => 'tag' . $i,
					'tag_url' => 'tag' . $i,
					'created_at' => $date,
					'updated_at' => $date
				));
		}
	}
}