```ruby
module RelativeDate
	def to_relative
		a = (Time.now-self).to_i

		case a
			when 0 then 'just now'
			when 1 then 'a second ago'
			when 2..59 then a.to_s+' seconds ago' 
			when 60..119 then 'a minute ago' #120 = 2 minutes
			when 120..3540 then (a/60).to_i.to_s+' minutes ago'
			when 3541..7100 then 'an hour ago' # 3600 = 1 hour
			when 7101..82800 then ((a+99)/3600).to_i.to_s+' hours ago' 
			when 82801..172000 then 'a day ago' # 86400 = 1 day
			when 172001..518400 then ((a+800)/(60*60*24)).to_i.to_s+' days ago'
			when 518400..1036800 then 'a week ago'
			else ((a+180000)/(60*60*24*7)).to_i.to_s+' weeks ago'
		end
	end
end

Time.send :include, RelativeDate
```

Add comment with source for RelativeDate
user
```ruby
# adapted from http://stackoverflow.com/a/195894/391999
module RelativeDate
	def to_relative
		a = (Time.now-self).to_i

		case a
			when 0 then 'just now'
			when 1 then 'a second ago'
			when 2..59 then a.to_s+' seconds ago' 
			when 60..119 then 'a minute ago' #120 = 2 minutes
			when 120..3540 then (a/60).to_i.to_s+' minutes ago'
			when 3541..7100 then 'an hour ago' # 3600 = 1 hour
			when 7101..82800 then ((a+99)/3600).to_i.to_s+' hours ago' 
			when 82801..172000 then 'a day ago' # 86400 = 1 day
			when 172001..518400 then ((a+800)/(60*60*24)).to_i.to_s+' days ago'
			when 518400..1036800 then 'a week ago'
			else ((a+180000)/(60*60*24*7)).to_i.to_s+' weeks ago'
		end
	end
end

Time.send :include, RelativeDate
```
assistant