Solution:
Maybe you can try something like this.
Although I don’t know the name of your column. Uncomment the print_r to get the column name.
foreach ($myids as $key => $row) {
// print_r($row);
$date_reformatted = strtotime($row->date_col);
$myids[$key]->date_col = date( 'c', $date_reformatted );
}