hi guy how to write a resolver that schedule action at specific timing? (time set by post body)

I think you can use a cron queue for this. Try using this package: https://www.npmjs.com/package/node-cron

thanks but this will run cron (every period of time). would like to run once only at specific time

Then you can use a job queue like bull: https://github.com/OptimalBits/bull

thanks looking into it but seem no specific time schedule

this might be some inspriration: https://devcenter.heroku.com/articles/scheduled-jobs-custom-clock-processes