Have you tried to google it? There are plenty of tutorials. One of them is here.
Also you can type in your terminal "man cron". man stands for manual, so you could read manual and see description and all available options.
posted 4 years ago
System time is in EST. But cron runs in GMT. How to run the cron based on system time ?
If you are using a wood chipper, you are doing it wrong. Even on this tiny ad:
Sauce Labs - World's Largest Continuous Testing Cloud for Websites and Mobile Apps