A Ruby tool to calculate the amount of years, days or hours+minutes on Earth since a date of birth.

age.rb

#!/usr/bin/env ruby
# encoding: utf-8
require 'rubygems'
require 'chronic'
require 'date'
if ARGV.size > 0
  dob = Chronic.parse(ARGV.join(' '))
  strings = ['You were', 'you']
else
  dob = Chronic.parse('01 january 1970 at 20:12 GMT+1')
  strings = ['I was', 'me']
end
time_since = DateTime.now - dob.__send__(:to_date)

def day_fraction_to_time(fr)
  h,   fr = fr.divmod(1.to_r/24)
  min, fr = fr.divmod(1.to_r/1440)
  s,   fr = fr.divmod(1.to_r/86400)
  return h, min, s, fr
end

hours, minutes, seconds, frac = day_fraction_to_time(time_since)
total_minutes = (minutes + 60 * hours)
puts "#{strings[0]} born #{'%0.2f' % time_since} Terran days, or #{hours} hours and roughly #{minutes} minutes ago. This makes #{strings[1]} about #{total_minutes} minutes (or about #{'%0.2f' % (total_minutes / 525949.2)} Terran years) old"