LaravelでCarbonを使いたい時

まず、phpの日付関数

Route::get('/dates', function(){
	$date = new DateTime('+1 week');

	echo $date->format('m-d-Y');
});

続いてCarbon
composerで探します
$ php composer.phar search carbon
nesbot/carbon A simple API extension for DateTime.
nesbot/carbon An API extension for DateTime that supports 281 different languages.

anyway, laravelはdefaultでcarbonはincludeされています。
use Carbon\Carbonでクラスを指定すれば、すぐに使えます。

carbon

use Carbon\Carbon;

Route::get('/dates', function(){
	$date = new DateTime('+1 week');

	echo $date->format('m-d-Y') . "<br>";

	echo Carbon::now();

	echo '<br>';
	echo Carbon::now()->addDays(10)->diffForHumans();

	echo '<br>';
	echo Carbon::now()->subMonths(5)->diffForHumans();

	echo '<br>';
	echo Carbon::now()->yesterday()->diffForHumans();

	echo '<br>';

});