Run a cron job every minute only on specific hours?

Question

How do you run a cron job every minute only on specific hours? Like so:

It will only check every minute from 11AM to 12AM, 4PM to 5PM and 9PM to 10PM<

Answer 1

As per the cron format

     

* * * * * *
| | | | | | 
| | | | | +-- Year              (range: 1900-3000)
| | | | +---- Day of the Week   (range: 1-7, 1 standing for Monday)
| | | +------ Month of the Year (range: 1-12)
| | +-------- Day of the Month  (range: 1-31)
| +---------- Hour              (range: 0-23)
+------------ Minute            (range: 0-59)

the solution should be

* 11,16,21 * * * *