表达式说明: 每隔 30 秒 规范化表达式: */30 * * * * * 时区: UTC 接下来的执行时间: 1. 2026/09/11 UTC 14:05:30 (UTC 时间: 2026/09/11 UTC 14:05:30) 2. 2026/09/11 UTC 14:06:00 (UTC 时间: 2026/09/11 UTC 14:06:00) 3. 2026/09/11 UTC 14:06:30 (UTC 时间: 2026/09/11 UTC 14:06:30) 4. 2026/09/11 UTC 14:07:00 (UTC 时间: 2026/09/11 UTC 14:07:00) 5. 2026/09/11 UTC 14:07:30 (UTC 时间: 2026/09/11 UTC 14:07:30)