Cron Expression
Since version 1.8.0, Issue Reminders add-on support cron expression as period specification. This guide will helps you to understand how it works but you can use any other tutorial on cron expressions because it is a standard, not specific to Issue Reminders.
Cron Expression Testing
You can test your cron expressions on https://crontab.guru
Format
A cron expression consist of 5 parts.
MIN HOUR DOM MON DOW
Field | Description | Allowed Value |
|---|---|---|
MIN | Minute field | 0 to 59 |
HOUR | Hour field | 0 to 23 |
DOM | Day of Month | 1-31 |
MON | Month field | 1-12 |
DOW | Day Of Week | 0-6 (Sun, Mon, Tue, Wed, Thu, Fri, Sat) |
Things to Know
Resolution of all reminders are 5 minutes, so you can't create a reminder with a period of less than 5 minutes. Even if you can write a cron expression it will not fire every minute, it will only fire at every 5 minutes.
Example Cron Expressions
Cron Expression | Explanation |
|---|---|
0 0 * * * | Every hour, for example 13:00, 14:00. |
30 0 * * * | Every half an hour, for example 13:30, 14:30. |
0 0 * * * | Same with 1st example. Every hour. |
0 0 1 1 * | Every year at 12:00 AM on 1 of January. |
0 7 L * * | Last day of every month at 07:00 AM. |
0 19 * * 1 | Every Monday on 19:00. |
30 8 1-7 * 1 | First Monday of every month at 08:30 AM. |
15 10 * * 1,5 | Every Monday and Friday at 10:15 AM. |
15 10 * * 1-5 | Every weekday (Mon-Fri) at 10:15 AM. |
0 0 1 1,6 * | At 00:00 on day-of-month 1 in January and June. |
* * * * * | Every minute. But not valid for Issue Reminders add-on. It will only work with a period of 5 minutes as explained at Things to Know Section. |
* 0 * * * | Every minute between 12:00 AM and 01:00 AM of every day. It will only work with a period of 5 minutes as explained at Things to Know Section. |