if (!empty($campaign_start_date) && !empty($hidden_campaign_start_date)) {
return $campaign_start_date < $hidden_campaign_start_date ? $campaign_start_date : $hidden_campaign_start_date;
} elseif (!empty($campaign_start_date)) {
return $campaign_start_date;
} elseif (!empty($hidden_campaign_start_date)) {
return $hidden_campaign_start_date;
} else {
return #תאריך חתימה#;
}