MySql Oracle date comparison

MySql:

			if(!StringUtil.isEmpty(dateStart)){
				Date date = (Date)params.get("dateStart");
				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
				dateStart = sdf.format(date);
				sb.append(" AND FINAL.creation_date >= '"+dateStart+"'");
			}
			if(!StringUtil.isEmpty(dateEnd)){
				Date date = (Date)params.get("dateEnd");
				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 23:59:59");
				dateEnd = sdf.format (date);
				sb.append(" AND FINAL.creation_date <= '"+dateEnd+"'");
			}

Oracle:

if(!StringUtil.isEmpty(dateStart)){
	Date date = (Date)params.get("dataStart");
	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
	dataStart= sdf.format(date);
	sb.append(" AND FINAL.APPROVE_DATE <= to_date('"+dataStart+"','yyyy-mm-dd hh24:mi:ss')");
}
if(!StringUtil.isEmpty(dataEnd)){
	Date date = (Date)params.get("dataEnd");
	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 23:59:59");
	dataEnd = sdf.format (date);
	sb.append(" AND FINAL.APPROVE_DATE <= to_date('"+dataEnd+"','yyyy-mm-dd hh24:mi:ss')");
}