Bondie

Bondie is a simple calculator for the bond properties. It can calculate Yield To Maturity (YTM), interest payments dates or price based on YTM.

Add this line to your application's Gemfile:

gem 'bondie'

And then execute:

$ bundle

Or install it yourself as:

$ gem install bondie

Calculation YTM based on price and date:

issue = Bondie::Issue.new(coupon: 0.0622, maturity_date: Date.parse('2016-08-22'), coupon_frequency: 4)
issue.ytm(Date.parse('2015-09-07'), price: 100.8)

It will not count exact yield, but it will approximate it - you can set maximum approximation error by adding approximation_error parameter to the method.

You can also check interest payments dates:

issue = Bondie::Issue.new(coupon: 0.0622, maturity_date: Date.parse('2016-08-22'), coupon_frequency: 4)
issue.interest_payments(Date.parse('2015-09-07'))

Currently it will not skip weekends or other days without bond quotations, so it can be inaccurate.

Also it's possible to check price on which it will generate given yield:

issue = Bondie::Issue.new(coupon: 0.0622, maturity_date: Date.parse('2016-08-22'), coupon_frequency: 4)
issue.price(0.05156, Date.parse('2015-09-07'))

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 a new Pull Request