Daring Fireball max time between posts/links: https://daringfireball.net/linked/2022/06/22/kottke-sabbatical

daring_fireball.rb

require "open-uri"

r = -> { URI(_1).read }

post_dates = r.("https://daringfireball.net/archive/")
  .scan(%r{<small>(.+?)</small>})
  .map { |(x)| Date.parse(x.gsub("&nbsp;", " ")) }

link_dates = r.("https://daringfireball.net/linked/")
  .scan(%r{href="(.+?/linked/20\d\d/.+?)"})
  .flat_map { |(x)| r.(x).scan(%r{<h2 class="dateline">(.+?)</h2>}).map { |(y)| Date.parse(y) } }

p (post_dates + link_dates).sort.uniq.each_cons(2).map { [ _1.to_s, _2.to_s, (_2 - _1).to_i ] }.max_by(&:last)