CRON expressions

Azure Functions uses the NCronTab library to interpret CRON expressions. A CRON expression includes six fields:

{second} {minute} {hour} {day} {month} {day-of-week}

Each field can have one of the following types of values:

 Type                           Example          When triggered

 A specific value               0 5 * * * *      at hh:05:00 where hh is every hour 
                                                 (once an hour)
 All values (*)                 0 * 5 * * *      at 5:mm:00 every day, where mm is 
                                                 every minute of the hour (60 times 
                                                 a day)
 A range (- operator)           5-7 * * * * *    at hh:mm:05,hh:mm:06, and hh:mm:07 
                                                 where hh:mm is every minute of every
                                                 hour (3 times a minute)

 A set of values (, operator)   5,8,10 * * * * * at hh:mm:05, hh:mm:08, and hh:mm:10
                                                 where hh:mm is every minute of every
                                                 hour (3 times a minute)

 An interval value (/ operator) 0 */5 * * * *    at hh:05:00, hh:10:00, hh:15:00, and 
                                                 so on through hh:55:00 where hh is
                                                 every hour (12 times an hour)

Refs.:

https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-timer#cron-expressions