$date = strtotime(date("Y-m-d"));
$strSQL = "SELECT * FROM store INNER JOIN drug on store.Drg_Barcode = drug.Drg_Barcode WHERE
(strtotime(store.Drg_Exp)-$date)/(60*60*24) > store.Udrg_Wnng AND store.Drg_Qtttotal > 0 order by store.Drg_Exp ";
$strSQL = "SELECT * FROM store INNER JOIN drug on store.Drg_Barcode = drug.Drg_Barcode WHERE
((strtotime(store.Drg_Exp)-(strtotime($date))/(60*60*24) > store.Udrg_Wnng) AND (store.Drg_Qtttotal > 0) order by store.Drg_Exp ";