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  package Test::Form;

...
  has_field 'date_time.year';
  has_field 'date_time.month';
  has_field 'date_time.day';

has_constraint 'contains_aaa' => ( qr/aaa/, 'Must contain aaa' );

package Test::Form;

   use HTML::FormHandler::Moose;
...
   has_field 'date_time.year';
   has_field 'date_time.month';
   has_field 'date_time.day';