Cron expression
30 9 21 AUG *
This cron expression schedules a command to run at 09:30, on day 21 of the month, only in August.
April 2026
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What this cron means, field by field
Each field of 30 9 21 AUG * controls one dimension of the schedule. Hover over any value in the editor above to see its tooltip; the table below summarises the same information.
| Field | Value | Means | Range / hint |
|---|---|---|---|
| minute | 30 | at minute 30 | 0-59. The minute(s) of the hour the job will fire. |
| hour | 9 | at hour 9 | 0-23. The hour(s) of the day the job will fire (0 = midnight, 23 = 11 PM). |
| day of month | 21 | at day of month 21 | 1-31. The day(s) of the month. Use * if you want every day. |
| month | AUG | at month AUG | 1-12 or JAN-DEC. The month(s). Use * for every month. |
| day of week | * | every value (wildcard) | 0-7 or SUN-SAT (0 and 7 both mean Sunday). Use * for every weekday. |
Next 5 runs
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Similar cron expressions
Common variations and tweaks of 30 9 21 AUG *.
Examples
- 018***Every day at 18:00
- 0*/5***Every 5 hours
- 018**1-5Weekdays at 18:00
- 001**Once a month
Cheatsheet
Where else this cron could be used
The same expression 30 9 21 AUG * works in:
- Standard Unix
crontab(5-field syntax). - AWS EventBridge / Lambda Scheduled (with a 6th field for year, often
*). - Vercel cron jobs (declared in
vercel.json). - Quartz Scheduler and node-cron, robfig/cron and similar libraries.
Run this cron in production
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Schedule
“at 09:30, on day 21 of the month, only in August”
Next run
in 23s