timesince.rb

def timesince(d, now=Time.now)
  delta = (now - d).to_i
  return "0 minutes" if delta <= 60

  chunks = [
    [60 * 60 * 24 * 356 , 'year'   ],
    [60 * 60 * 24 * 7   , 'week'   ],
    [60 * 60 * 24       , 'day'    ],
    [60 * 60            , 'hour'   ],
    [60                 , 'minute' ]
  ]

  pluralize = lambda {|amount, unit| "#{amount} #{unit}#{'s' if amount != 1}"}
  ret = ""
  chunks.each do |seconds, unit|
    amount, delta = delta.divmod(seconds)
    ret << pluralize[amount, unit] << ' ' if amount > 0
  end
  ret.strip
end

irb(main):001:0> timesince 1.day.ago
=> "1 day"
irb(main):002:0> timesince 23.hours.ago
=> "23 hours"
irb(main):003:0> timesince 3.minutes.ago
=> "3 minutes"
irb(main):004:0> timesince (1.year + 3.days + 5.hours + 3.minutes).ago
=> "1 year 1 week 5 days 5 hours 3 minutes"
irb(main):005:0> 

Month calculations are wrong ofc (not all months have 30 days)

Fixed.