Home โบ Quartz โบ Every 30 seconds
Quartz cron expression: every 30 seconds
To run a Quartz job every 30 seconds, use:
0/30 * * * * ?Every 30 seconds.
Your week at a glance
Upcoming runs
| # | Local | UTC | From now |
|---|
Copy-ready code
Why use this schedule
Twice a minute, using the seconds field that Unix cron lacks. Only schedulers built into the application, like Quartz and Spring, can express it; system cron and cloud schedulers cannot.
- Fast health probes
- Refreshing live counters
- Draining a small outbox table
First runs, as an example
Starting from 1 January 2027, evaluated in UTC:
| # | Date and time (UTC) |
|---|---|
| 1 | Fri, 01 Jan 2027, 00:00:00 |
| 2 | Fri, 01 Jan 2027, 00:00:30 |
| 3 | Fri, 01 Jan 2027, 00:01:00 |
| 4 | Fri, 01 Jan 2027, 00:01:30 |
| 5 | Fri, 01 Jan 2027, 00:02:00 |
| 6 | Fri, 01 Jan 2027, 00:02:30 |
Every 30 seconds in every dialect
| System | Expression |
|---|---|
| Quartz (this page) | 0/30 * * * * ? |
| Spring | */30 * * * * * |
| node-cron | */30 * * * * * |
| Azure Functions | */30 * * * * * |
Need to translate a different expression? Use the cron converter.
Ready-to-use Quartz config
Drop this into your project. The expression is the one above.
Trigger trigger = TriggerBuilder.newTrigger()
.withIdentity("myTrigger", "group1")
.withSchedule(CronScheduleBuilder.cronSchedule("0/30 * * * * ?")
.inTimeZone(TimeZone.getTimeZone("UTC")))
.build();The Quartz fields, in order: second (0-59), minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (1-7, 1 = Sunday), year (1970-2199, optional).
Things to watch out for in Quartz
- The first field is seconds. Leaving it as * makes the job run 60 times a minute, so set it deliberately.
- 0/N and */N both work, but the schedule restarts at the start of each hour, so N should divide 60 for even gaps.
- Quartz uses the JVM default time zone unless you set one: CronScheduleBuilder.cronSchedule(expr).inTimeZone(TimeZone.getTimeZone("UTC")).
The common mistake with this schedule
If a job takes more than 30 seconds, runs will overlap or be skipped depending on the scheduler. In Spring use fixedDelay when you want a gap after the job finishes.
Frequently asked questions
How do I run a Quartz job every 30 seconds?
Use 0/30 * * * * ?. Every 30 seconds.
What is the every 30 seconds cron expression in other systems?
Spring: */30 * * * * *; node-cron: */30 * * * * *; Azure Functions: */30 * * * * *. The table on this page lists every dialect.
Which time zone does Quartz use for this schedule?
Quartz uses the JVM default time zone unless you set one: CronScheduleBuilder.cronSchedule(expr).inTimeZone(TimeZone.getTimeZone("UTC")).