node-cron run job every 3 hours

Question

I am trying to run a node-cron job every 3 hours and I am not sure if I am doing it right.

Right now I am using:

* * */8 * * *

Is this correct?

Answer 1

You should zero-out the second and minute values, and use a step of /3. The cron expression for this is

0 0 */3 * * *

Which evaluates to 'At 0 seconds, 0 minutes every 3rd hour'.

Your current expression * * */8 * * * would try to run every second of every minute past every 8th hour.