Sonata date picker month resets to 1 - symfony

Question

I use sonata_type_datetime_range_picker. I works correct on the frontend side. But when I submit form it remakes month value to 1. I.e. my submitted value is "2017-02-02 03:14:00" and value after submit is "2017-01-02 03:14:00". According to the profiler date is correct in the Request object but is wrong in Symfont Form Component.
My admin code
$datePickerOptions = [
'format' => "YYYY-MM-DD HH:mm:SS",
'datepicker_use_button' => false,
'dp_use_minutes' => false,
'dp_use_seconds' => false,
'dp_side_by_side' => true,
'dp_language' => 'en',
];
$datagridMapper
->add(
'dateTime',
'doctrine_orm_datetime_range',
[
'show_filter' => true,
'field_type' => 'sonata_type_datetime_range_picker',
'field_options' => [
'field_options_start' => $datePickerOptions,
'field_options_end' => $datePickerOptions,
],
]
);
What am I doing wrong?

Answer 1

Ok, I kinda found the working solution myself. Maybe it helps someone other sometime:
$now = new \DateTime();
$historyStart = new \DateTime('Dec 20 2016');
$dateFormat = 'd.m.y H';
$datagridMapper
->add(
'dateTime',
'doctrine_orm_datetime_range',
['show_filter' => true,],
'sonata_type_datetime_range_picker',
[
'field_options_start' => [
'dp_min_date' => $historyStart->format($dateFormat),
'dp_max_date' => $now->format($dateFormat),
'dp_default_date' => $now->format($dateFormat),
'dp_language' => 'en',
'format' => 'dd.MM.yy HH',
'datepicker_use_button' => false,
'dp_use_minutes' => false,
'dp_use_seconds' => false,
'dp_side_by_side' => true,
],
'field_options_end' => [
'dp_min_date' => $historyStart->format($dateFormat),
'dp_max_date' => $now->format($dateFormat),
'dp_default_date' => $now->format($dateFormat),
'dp_language' => 'en',
'format' => 'dd.MM.yy HH',
'datepicker_use_button' => false,
'dp_use_minutes' => false,
'dp_use_seconds' => false,
'dp_side_by_side' => true,
]
]
);