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node-cron

node-cron Expression Generator & Tester

node-cron schedules tasks in Node.js with a cron string. Unlike classic crontab it accepts an optional leading seconds field, and it requires day-of-month and day-of-week to both match. Type an expression to see what it means and when it fires.

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What to know about node-cron cron

Common node-cron schedules

Ready-made expressions for the schedules people search for most. Each page explains the expression and shows the first run times.

ScheduleExpression
Every minute* * * * *
Every 5 minutes*/5 * * * *
Every 10 minutes*/10 * * * *
Every 15 minutes*/15 * * * *
Every 30 minutes*/30 * * * *
Every hour0 * * * *
Every 2 hours0 */2 * * *
Every 3 hours0 */3 * * *
Every 6 hours0 */6 * * *
Every 12 hours0 0,12 * * *
Twice a day at 9am and 9pm0 9,21 * * *
Every day at midnight0 0 * * *
Every day at 2:00 AM0 2 * * *
Every day at 9:00 AM0 9 * * *
Every day at 6:00 PM0 18 * * *
Every weekday at 9:00 AM0 9 * * 1-5
Every weekday at 8:30 AM30 8 * * 1-5
Hourly during business hours on weekdays0 9-17 * * 1-5
Every 15 minutes during business hours on weekdays*/15 9-17 * * 1-5
Every Saturday and Sunday at 10:00 AM0 10 * * 0,6
Every Monday at 9:00 AM0 9 * * 1
Every Friday at 5:00 PM0 17 * * 5
Every Sunday at midnight0 0 * * 0
On the 1st of every month at midnight0 0 1 * *
On the 15th of every month at midnight0 0 15 * *
On the last day of every month0 0 L * *
On the first Monday of every month at 9:00 AM0 9 1-7 * 1
On the last Friday of every month at noon0 12 * * 5L
On the first day of every quarter0 0 1 1,4,7,10 *
Once a year on January 1st0 0 1 1 *
Every 10 seconds*/10 * * * * *
Every 30 seconds*/30 * * * * *

Frequently asked questions

Does node-cron support seconds?

Yes. The first field is an optional seconds field, so */10 * * * * * runs every ten seconds. With five fields the task runs at second 0.

Why does my schedule rarely run?

Because node-cron ANDs the day fields. 0 10 1 * 1 means "the 1st AND a Monday", which happens only a few times a year. Leave one of the day fields as *.

How do I run something on the first Monday of the month?

Use 0 9 1-7 * 1: days 1 to 7, and Monday. Because both must match, only the first Monday qualifies.

Moving a schedule between systems? Use the cron format converter, or read the cron error fixes.

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