Parse Cron Format Strings, Write Cron Format Strings and Calculate Execution Dates.

1. Add crontab to your list of dependencies in mix.exs:

def deps do
  [{:crontab, "~> 1.1.2"}]
end

2. Ensure crontab is started before your application:

def application do
  [applications: [:crontab]]
end

Please look into the Documentation for usage examples.