What 0 9,17 * * * means
Two runs a day at 09:00 and 17:00 using a comma list in the hour field — a morning and an evening pass without a second cron line.
In plain English, cron reads this as: at 09:00 am and 05:00 pm, every day.
Field-by-field breakdown
| Field | Value | Meaning |
|---|---|---|
| Minute | 0 | at 0 |
| Hour | 9,17 | values 9,17 |
| Day of month | * | every value |
| Month | * | every value |
| Day of week | * | every value |
Editing this schedule
To adjust this expression or explain a different one, open the full cron expression parser — it explains any crontab line, lists upcoming runs and breaks down each field as you type. New to the syntax? The practical guide to cron expressions walks through every field with worked examples.