Periodical is a simple framework for working with durations and periods. A duration measures a range of time bounded by a from date and to date. A period is a relative unit of time such as 4 weeks.
The original idea for this library came from a Python script which performed backup rotation from 2009. In particular, I thought it had a novel way to retain backups according to a given policy (e.g. one backup every year for 10 years, one backup every month for 12 months, one backup every week for 8 weeks, one backup every day for 30 days). This is done by constructing a special slot based hash structure with keys based on the date being stored. This functionality is used by LSync for performing backup rotation (i.e. deleting old backups).
In addition, I had a need to implement periodical billing in Financier. Not only can this gem advance a date by a given period, it can compute the number of periods between two dates. This is useful for invoicing, say, once every 6 months for a weekly or monthly service.
Add this line to your application's Gemfile:
$ bundle add periodicalThe main use case for this framework involves periodic billing or accounting (e.g. calculating fortnightly rental payments).
duration = Periodical::Duration.new(Date.parse("2010-01-01"), Date.parse("2010-02-01"))
period = Periodical::Period.new(2, :weeks)
# How many periods in the duration?
count = duration / period
# Calculate the date which is 2 * (2 weeks)
next = period.advance(duration.from, 2)- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request
Released under the MIT license.
Copyright, 2010, 2014, 2016, by Samuel G. D. Williams.
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