Month view calendar do not display items on the first day of the month

This code works for me. But I'm not sure if this the best solution.

<?php
function your_module_query_alter(&$view, &$query) {
  if ($view->name == "your_view" )
  {
      // change the from date format to YYY-MM-DD
      $view->query->where['date']['conditions'][0]['field'] = "DATE_FORMAT(FROM_UNIXTIME(field_data_your_field.your_field_value), '%Y-%m-%d') >= :node_date_argument AND DATE_FORMAT(FROM_UNIXTIME(field_data_your_field.your_field_value), '%Y-%m') <= :node_date_argument1";
      // take the date that the calendar passes
      $given_date = $view->query->where['date']['conditions'][0]['value'][':node_date_argument'];
      // and subtract one day
      $new_date =(date('Y-m-d',  strToTime($given_date.' this year -1 day')));
      $view->query->where['date']['conditions'][0]['value'][':node_date_argument'] = $new_date;
  }
}

?>