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Cron 解释器
免费 cron 表达式解码器。粘贴一个五字段 cron 表达式，即可获得其运行时间的普通语言描述。适用于 pg_cron、Linux crontab、GitHub Actions。
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Understanding · Five fields, a whole schedule.
本深度章节目前仅有英文版本。上方的转换工具支持您的语言;长篇说明文章尚未翻译。
常见问题
Quick answers.
›What are the 5 cron fields?
minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (0-7, both 0 and 7 mean Sunday).
›How do I run something every 15 minutes?
Use */15 * * * * — that's 'every 15 minutes, every hour, every day'.
›What does the '?' mean?
Quartz/Java cron uses '?' to mean 'no specific value' in either day-of-month or day-of-week. Standard Unix cron doesn't use it.
›Day of week — is Sunday 0 or 7?
Both, in standard Unix cron. Some systems (Quartz) use 1-7 with Sunday = 1. We follow Unix convention.
›Is the explainer free?
Yes — fully free, no signup, runs in your browser.
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