问题
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?
回答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.
来源：https://stackoverflow.com/questions/41597538/node-cron-run-job-every-3-hours