coffeescript version of ActiveSupport::Date

date.coffee

define [], ->
   periods =
     second: second = 1000
     minute: min = 60 * second
     hour: hour = min * 60
     day: day = hour * 24
     week: week = day * 7
     month: month = day * 29.6
     year: day * 356

   for period, value of periods
     do (period, value) ->
       Number::[period] = Number::["#{period}s"] = -> value * this

   extensions =
     Number:
       # differences
       fromNow: ->  this + (+new Date())
       from: (date) ->  (+date) + this
       before: (date) -> (+date) - this
       ago: (date) ->  (+new Date()) - this
       # conversions
       toDate: -> new Date(this)
     Date:
       secondsAfter: (date) -> ((+this) - (+date)) / 1000
       secondsBefore: (date) -> ((+date) - (+this)) / 1000

   unless Date.now
     Date.now = -> new Date()

   for type, methods of extensions
     for name, method of methods
       @[type]::[name] = method

   null