MyAge

Add this line to your application's Gemfile:

gem 'my_age'

And then execute:

$ bundle

Or install it yourself as:

$ gem install my_age

Mixin MyAge module and call age method. It assumes your class has an attribute called dob that stores the date of birth.

class User
  attr_accessor :dob
  include MyAge
end

user = User.new
## by default, age is calculated as of today
user.age
## but you can supply a specific date
user.age(date)
## there is a host of helpers starting with 'age_as_of_' to specify the date too 
user.age_as_of_tomorrow

If your date-of-birth attribute is not called dob, you can assign it using my_dob so the gem knows where to look for it.

class User
  attr_accessor :date_of_birth
  include MyAge
  my_dob :date_of_birth  #my attribute name
end

##everything else is the same

You can use the helpers in active_support/core_ext/date/calculations. Methods are constructed like age_as_of_helper. All dates specified this way are relative to today.

## with #end_of_month, you can call
user.age_as_of_end_of_month

## this gives you the age as of 9 months later from today
user.age_as_of_months_since(9)

## to be explicit, you can call
user.age_as_of_today  ## same as user.age

$ my_age is -d 1981-08-01 -a 1985-08-01
$ #=> 4

$ my_age is -d 1981-01-08
$ #=> age as of today

##ActiveSupport helpers work here too
$ my_age is -d 1981-01-03 -a tomorrow
$ my_age is -d 'years_ago(5)' -a tomorrow  ##=> 5

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/my_age.

The gem is available as open source under the terms of the MIT License.