Split GPX files generated by GPSBabel based on Google Takeout "My Location" KML into multiple months

split-takeout-gpx.rb

INPUT = "Google Maps Location History.gpx"
OUTPUT_PREFIX = "Result"
START_YEAR = 2013

(START_YEAR..Time.now.year).each do |year|
  (1..12).each do |month|
    long_month = sprintf('%02d', month)
    puts filename = "#{OUTPUT_PREFIX} #{year}-#{long_month}.gpx"
    `head -n5 "#{INPUT}" > "#{filename}"`
    `grep -B2 -A1 "<time>#{year}-#{long_month}" "#{INPUT}" >> "#{filename}"`
    `tail -n3 "#{INPUT}" >> "#{filename}"`
  end
end