Analyzing Google location data https://maps.google.com/locationhistory/b/0

analyze.rb

require 'haversine'
require 'json'
require 'time'
require 'date'

data = JSON.parse(File.read('LocationHistory.json'))

jyvaskyla = [62.244747, 25.7472184]
away_days = {}

data['locations'].reverse.each do |location|
  time = Time.at(location['timestampMs'].to_i / 1e3)

  lat = location['latitudeE7'] / 1e7
  lon = location['longitudeE7'] / 1e7

  pos = [lat, lon]

  if Haversine.distance(pos, jyvaskyla).to_kilometers > 100.0 && time.year == 2014
    away_days[time.to_date] = true
  end
end

puts away_days.keys.count

Note: Get the JSON data from https://www.google.com/settings/takeout (choose only Location History)