Cronex

A Ruby library that converts cron expressions into human readable strings. Translated to Ruby from cron-expression-descriptor (C#) via cron-parser (Java).

Original Author & Credit: Brady Holt (http://www.geekytidbits.com).

Features

• Supports all cron expression special characters including: * / , - ? L W #
• Supports 5, 6 (w/ seconds or year), or 7 (w/ seconds and year) part cron expressions
• Provides casing options (sentence, title, lower)
• Support for non-standard non-zero-based week day numbers
• Supports printing to locale specific human readable format
• Supports displaying times in specific timezones

For a quick intro to cron see Quartz Cron Tutorial.

Available Locales

• English
• Brazilian
• Dutch
• French
• German
• Italian
• Romanian
• Russian

Installation

Add this line to your application's Gemfile:

gem 'cronex'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install cronex

Usage

Zero based day of week

Cronex::ExpressionDescriptor.new('*/5 15 * * 1-5').description
=> Every 5 minutes, at 3:00 PM, Monday through Friday

Cronex::ExpressionDescriptor.new('0 0/30 8-9 5,20 * ?').description
=> Every 30 minutes, between 8:00 AM and 9:59 AM, on day 5 and 20 of the month

Non-zero based day of week

Cronex::ExpressionDescriptor.new('*/5 15 * * 1-5', zero_based_dow: false).description
=> Every 5 minutes, at 3:00 PM, Sunday through Thursday

Localization

Cronex::ExpressionDescriptor.new('30 2 * 2 1-5', locale: 'fr').description
=> À 2:30 AM, lundi à vendredi, seulement en février

Timezones

Cronex::ExpressionDescriptor.new('0-10 11 * * *', timezone: 'America/Los_Angeles').description
=> Every minute between 4:00 AM and 4:10 AM # PDT or
=> Every minute between 3:00 AM and 3:10 AM # PST

Strict quartz-scheduler implementation support

Cronex::ExpressionDescriptor.new('* * * * *', strict_quartz: true).description
=> Cronex::ExpressionError (Error: Expression only has 5 parts. For 'strict_quartz' option, at least 6 parts are required)

See spec tests for more examples.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request