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module Mapping
  module Utilities
    module NationalGrid
      # All the values and formula are from the Ordnance Survey publication:
      # A guide to coordinate systems in Great Britain
      # https://www.ordnancesurvey.co.uk/documents/resources/guide-coordinate-systems-great-britain.pdf

      # Scale factor on the central meridian for the Transverse Mercator projection
      # https://en.wikipedia.org/wiki/Transverse_Mercator_projection
      F0 = 0.9996012717

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When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

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Rails.application.routes.draw do

  get '/(:locale)/products/(:category)/(page/:page).:extension',
        :to => 'products#index',
        :as => :products,
        :constraints => {
          :locale => /[a-z]{2}/,
          :category => /.+?/,
          :page => /\d+/
        },

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class ActivationsController < ApplicationController

  respond_to :json

  def create
    new_password = params[:user] && params[:user][:password]
    token = params[:confirmation_token]

    if !new_password
      render_errors({"password"=>["can't be blank"]}.to_json)

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formats = [
  "[A-Z]{2}[0-9]{2}[A-Z]{3}",
  "[A-Z]{1}[0-9]{3}[A-Z]{3}",
  "[A-Z]{3}[0-9]{3}[A-Z]{1}"
]

pattern = /\A#{formats.join("|")}\z/

candidates = %w[
  RF10AK0

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