# Crontab syntax for periodic tasks
Actions based on a schedule and the periodic ticket re-balancing use [crontab syntax ](https://en.wikipedia.org/wiki/Cron)to form a schedule for periodic tasks. This article provides a brief overview of the crontab format.

## Format of entry

```txt
  * * * * *
# | | | | |
# | | | | day of the week (0–6) (Sunday to Saturday; 
# | | | month (1–12)             7 is also Sunday on some systems)
# | | day of the month (1–31)
# | hour (0–23)
# minute (0–59)
```

You can also check the syntax or find a suitable one using specialized services, such as [crontab.guru](https://crontab.guru/).

## Examples

Run the action once every three minutes:

```txt
*/3 * * * *
```

Run the action every hour at XX:13:


```txt
13 * * * *
```

Run every Sunday at 7:00:

```txt
0 7 * * 0
```

Run at 6:30, 12:30 and 18:30 every day:

```txt
30 6,12,18 * * *
```