# 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://crontab.guru](https://crontab.guru/)