Offset your time by timezone difference

time.rb

class Time
	# Adds an offset to your time
	# So you can go from
	# Fri, 22 Jul 2016 07:56:38 UTC +00:00
	# To,
	# Fri, 22 Jul 2016 13:26:38 UTC +00:00
	#
	# Example,
	# t = Time.now.utc
	# => Fri, 22 Jul 2016 07:56:38 UTC +00:00
	# t.offset("+05:30")
	# => Fri, 22 Jul 2016 13:26:38 UTC +00:00
	#
	# Offsets must be of the format,
	# (+|-)(0-1)(1-12):(0-5)(0-9)
	def offset(off)
		if match = off.match(/^(?:Z|([+-])((?:2[0-3]|[01][0-9])):([0-5][0-9]))$/)
  			set, hour, minute = match.captures
			return self.send(set, hour.to_i.hour).send(set, minute.to_i.minute)
		else
			return self
		end
	end
end