PHP Carbon diffInMonths

我有 PHP Carbon diffInMonths函数的问题.
在某些情况下,我得到错误的结果.
例如：

$start = \Carbon\Carbon::create(2017,4,1);
$end   = \Carbon\Carbon::create(2017,5,1);

echo $start->diffInMonths($end);

我应该得到1,但我得到0.
我使用PHP 7.1和Laravel 5.4.

有没有人有同样的问题？我该如何解决？
谢谢您的帮助！

解决方法

由于 github上的碳问题说这是一个错误.这是 more.

<?PHP
$d1 = new DateTime("2015-03-01 00:00:00.000000",new DateTimeZone('Europe/London'));
$d2 = new DateTime("2015-05-01 00:00:00.000000",new DateTimeZone('Europe/London'));

$diff = $d2->diff($d1);

print_r($diff);

产量

DateInterval Object ( [y] => 0 [m] => 1 [d] => 30 [h] => 0 [i] => 0 [s] => 0 [f] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 61 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )