A quick & dirty script to annotate GPX with fake time data, so you can import it into Strava.

gistfile1.txt

#!/usr/bin/env ruby

require 'rexml/document'
require 'rexml/element'

doc = REXML::Document.new(File.open('London_Classic_2015.gpx', 'r'))

second = 0
min = 0
hour = 1
doc.elements.each('//trkpt') do |point|
	time = REXML::Element.new('time')
	time.text = "2013-05-11T%s:%s:%sZ" % [hour.to_s.rjust(2, "0"), min.to_s.rjust(2, "0"), second.to_s.rjust(2, "0")]
	second += 1
	if second > 59
		second = 0
		min += 1
	end
	if min > 59
		min = 0
		hour += 1
	end
	point.add time
end

doc.write(File.open('out.gpx', 'w'), 2)

This doesn't work!