I found a hacking solution. Surely not the best way, but a way:
In file /app/admin/models/Reservations_model.php
public function mailGetData() {
$data = [];
:
$data['reservation_date'] = $model->reserve_date->format(lang('system::lang.php.date_format_long'));
// Add this lines
$c_date = Carbon::createFromFormat(lang('system::lang.php.date_format_long'),
$data['reservation_date'])->locale(setting('default_language'));
$data['reservation_date'] = $c_date->isoFormat(lang('system::lang.php.date_format'));
// End
$data['reservation_guest_no'] = $model->guest_num;
:
}
Attention! It is a hack. It is in the ti-core. With the next update changes are gone!
Perhaps it helps someone.
Perhaps someone has a better solution.
