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K, sorry, I must be missing somehting. Here’s my code that doesn’t seem to work.
function my_acf_save_post( $post_id )
{
// vars
$fields = false;
// load from post
if( isset($_POST['fields']) )
{
$fields = $_POST['fields'];
// concert details
// event start date
//$fields['field_5217ac66687dc']
// event end date
//$fields['field_524b4ca5ff418']
if( empty( $fields['field_524b4ca5ff418'] ) )
$fields['field_524b4ca5ff418'] = $fields['field_5217ac66687dc'];
// calendar details
// event start date
//$fields['field_524b4c06af2a2']
// event end date
//$fields['field_524b4c3aaf2a4']
if( empty( $fields['field_524b4c3aaf2a4'] ) )
$fields['field_524b4c3aaf2a4'] = $fields['field_524b4c06af2a2'];
}
// ...
}
// run before ACF saves the $_POST['fields'] data
add_action('acf/save_post', 'my_acf_save_post', 1);
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