# Cron Definitions

### Cron Expression

### Basic structure

A cron expression consists of five individual parts (That is the basic version. Some cron expressions support additional values).

| **Part**     | **Allowed Values**          |   |
| ------------ | --------------------------- | - |
| Minutes      | 0-59                        |   |
| Hours        | 0-23                        |   |
| Day of month | 1-31                        |   |
| Month        | 1-12                        |   |
| Day of week  | 0-6 (0 = Sun, 1 = Mon, ...) |   |

\
In addition to the above values the following characters can be used.

| **Character** | **Meaning**                                                                                                                        |   |
| ------------- | ---------------------------------------------------------------------------------------------------------------------------------- | - |
| `*`           | **Any value** e.g. \* as the value for `Hour` will select all the possible values 0,1,2,..,23 "every hour".                        |   |
| `,`           | **value list separator** e.g. 0,30 as the value for `Minute` will select 0 and 30 "every half hour".                               |   |
| `-`           | **Range of values** e.g. 1-5 as the value for `Day of week` will select Monday thru Friday                                         |   |
| `/`           | **step values** e.g. \*/3 as the value for `Month` will select Jan, Apr, Jul, Oct. Writing "1,4,7,10" would yield the same result. |   |

### examples

* `15 1 * * *` every day at 1:15 am
* `0 8-17 1-5 * *` Monday thru Friday, once every hour between 8am and 5:59pm
* `0 5 1 */3 *` at 5am on the first day of every third month of the year (Jan, Apr, Jul, Oct)
* `0 0 1 1 *` start of the year
* `*/5 3-14 * * 6` every five minutes between 3am and 2:59pm only on a Saturday

Cron expressions are widely used. To get more detailed information those links might be helpful

* <https://en.wikipedia.org/wiki/Cron>
* [https://crontab.guru](https://crontab.guru/)


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