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require 'nokogiri'
require 'open-uri'
doc = Nokogiri::HTML(URI.open('https://www.timeanddate.com/time/zones/'))
h = {}
doc.css('#tz-abb tbody tr').each do |tr|
tds = tr.css('td')
abbr = tds[0].text.strip.downcase
offset = tds[3].text.strip.gsub(/UTC\s*/, '')
next if offset.include?('/') # skip ambiguous timezones
next if offset.empty?
hour, min = offset.split(':', 2)
offset = (Integer(hour) * 60 + (Integer(min || 0)))*60
if h.has_key?(abbr)
h[abbr] = false
else
h[abbr] = offset
end
end
h.delete_if{|_,v| !v}
lines = File.readlines('ext/date/zonetab.list')
lines.select{|l| l.include?(',')}.
map{|l| l.split(',', 2)[0]}.
each{|a| h.delete(a)}
h.sort.map{|k,v| "#{k},#{v}"}
lines.insert(-2, h.sort.map{|k,v| "#{k},#{v}\n"})
lines.flatten!
File.write('ext/date/zonetab.list', lines.join)
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