Go Language

Golang : Schedule Cron Jobs with Crontab

This golang tutorial help to create schedule a jon to execute at specific time interval

Golang Community Moderator. Software Engineer - Open Source Enthusiast. Goper Lover

Published · Oct 21 2019

By the way, I started to engage in golang recently... I remember that I used Golang to do something in LeTV, and I had to give up golang because of various problems. 

There is a function that requires regular execution tasks, because it is coupled with the internals of the project, so it is not suitable for operation with linux crontab. Find a popular golang cron module in github that is easy to use! We only need to register a bunch of tasks to the scheduler. 
. . .

Getting started
To get the package, execute:
go get gopkg.in/robfig/cron.v2
 
 To import this package, add the following line to your code:

import "gopkg.in/robfig/cron.v2"

Golang crontab project address:
https://github.com/robfig/cron

Specific documentation:
https://github.com/robfig/cron/blob/master/doc.go

https://play.golang.org/p/UvSgnYyWPCO


CRON Expression Format
A cron expression represents a set of times, using 6 space-separated fields. 
Field name     Mandatory?   Allowed values    Allowed special characters
----------     ----------   --------------    --------------------------
Seconds        No           0-59              * / , -
Minutes        Yes          0-59              * / , -
Hours          Yes          0-23              * / , -
Day of month   Yes          1-31              * / , - L W
Month          Yes          1-12 or JAN-DEC   * / , -
Day of week    Yes          0-6 or SUN-SAT    * / , - L #
Year           No           1970–2099         * / , -

 Note: Month and Day-of-week field values are case insensitive.  "SUN", "Sun", and "sun" are equally accepted. 


Predefined schedules
You may use one of several pre-defined schedules in place of a cron expression. 
Predefined schedules
You may use one of several pre-defined schedules in place of a cron expression. 
Entry       Description                                                             Equivalent to
@annually   Run once a year at midnight in the morning of January 1                 0 0 0 1 1 * *
@yearly     Run once a year at midnight in the morning of January 1                 0 0 0 1 1 * *
@monthly    Run once a month at midnight in the morning of the first of the month   0 0 0 1 * * *
@weekly     Run once a week at midnight in the morning of Sunday                    0 0 0 * * 0 *
@daily      Run once a day at midnight                                              0 0 0 * * * *
@hourly     Run once an hour at the beginning of the hour            