Home โบ node-cron โบ Twice a day at 9am and 9pm
node-cron cron expression: twice a day at 9am and 9pm
To run a node-cron job twice a day at 9am and 9pm, use:
0 9,21 * * *At minute 0, during hours 09, 21.
Your week at a glance
Upcoming runs
| # | Local | UTC | From now |
|---|
Copy-ready code
Why use this schedule
A morning and an evening run. Listing the two hours with a comma keeps the intent obvious to the next person reading the config, which matters more than saving a few characters.
- Morning and evening status reports
- Syncing inventory before and after business hours
- Refreshing a feed twice daily
First runs, as an example
Starting from 1 January 2027, evaluated in UTC:
| # | Date and time (UTC) |
|---|---|
| 1 | Fri, 01 Jan 2027, 09:00:00 |
| 2 | Fri, 01 Jan 2027, 21:00:00 |
| 3 | Sat, 02 Jan 2027, 09:00:00 |
| 4 | Sat, 02 Jan 2027, 21:00:00 |
| 5 | Sun, 03 Jan 2027, 09:00:00 |
| 6 | Sun, 03 Jan 2027, 21:00:00 |
Twice a day at 9am and 9pm in every dialect
| System | Expression |
|---|---|
| node-cron (this page) | 0 9,21 * * * |
| Quartz | 0 0 9,21 * * ? |
| Spring | 0 0 9,21 * * * |
| Crontab | 0 9,21 * * * |
| Kubernetes | 0 9,21 * * * |
| AWS EventBridge | 0 9,21 * * ? * |
| Jenkins | H 9,21 * * * |
| GitHub Actions | 0 9,21 * * * |
| Apache Airflow | 0 9,21 * * * |
| Azure Functions | 0 0 9,21 * * * |
| Google Cloud Scheduler | 0 9,21 * * * |
Need to translate a different expression? Use the cron converter.
Ready-to-use node-cron config
Drop this into your project. The expression is the one above.
import cron from 'node-cron';
cron.schedule('0 9,21 * * *', () => {
console.log('running a task');
}, { timezone: 'UTC' });The node-cron fields, in order: second (0-59), minute (0-59), hour (0-23), day-of-month (1-31), month (1-12), day-of-week (0-7, 0 and 7 = Sunday).
Things to watch out for in node-cron
- Five fields: minute, hour, day-of-month, month, day-of-week. Add a leading seconds field for sub-minute schedules.
- node-cron uses the server time zone unless you pass { timezone: "Asia/Kolkata" }. Its documentation advises timezone: "UTC" for jobs that must not skip or repeat when clocks change.
The common mistake with this schedule
Writing 9-21 means every hour from 9 to 21, not just those two. Use a comma for exactly two values.
Frequently asked questions
How do I run a node-cron job twice a day at 9am and 9pm?
Use 0 9,21 * * *. At minute 0, during hours 09, 21.
What is the twice a day at 9am and 9pm cron expression in other systems?
Quartz: 0 0 9,21 * * ?; Spring: 0 0 9,21 * * *; Crontab: 0 9,21 * * *. The table on this page lists every dialect.
Which time zone does node-cron use for this schedule?
node-cron uses the server time zone unless you pass { timezone: "Asia/Kolkata" }. Its documentation advises timezone: "UTC" for jobs that must not skip or repeat when clocks change.