case 'H': parse(optarg, hour, sizeof hour, 0); break;
case 'M': parse(optarg, minute, sizeof minute, 0); break;
case 'S': parse(optarg, second, sizeof second, 0); break;
case 'H': parse(optarg, hour, sizeof hour, 0); break;
case 'M': parse(optarg, minute, sizeof minute, 0); break;
case 'S': parse(optarg, second, sizeof second, 0); break;