Fast parsing of db timestamp (useful for postgresql and sqlite3 adapters with sequel )

fast_time_parse.rb

class Time
  class << self
    def relaxed_rfc3339(date)
      if /\A\s*
          (-?\d+)-(\d\d)-(\d\d)
          [T ]
          (\d\d):(\d\d):(\d\d)
          (?:\.(\d+))?
          (Z|[+-]\d\d(?::?\d\d)?)?
          \s*\z/ix =~ date
        year = $1.to_i
        mon = $2.to_i
        day = $3.to_i
        hour = $4.to_i
        min = $5.to_i
        sec = $6.to_i
        usec = $7 ? "#{$7}000000"[0,6].to_i : 0
        if $8
          zone = $8
          if zone == 'Z'
            offset = 0
          elsif zone =~ /^([+-])(\d\d):?(\d\d)?$/
            offset = ($1 == '+' ? 1 : -1) * ($2.to_i * 3600 + ($3 || 0).to_i * 60)
          end
          year, mon, day, hour, min, sec =
            apply_offset(year, mon, day, hour, min, sec, offset)
          t = self.utc(year, mon, day, hour, min, sec, usec)
          t.localtime unless zone =~ /Z|-00:?(00)?/
          t
        else
          self.local(year, mon, day, hour, min, sec, usec)
        end
      end
    end
    alias parse_heavy parse
    def parse(date)
      relaxed_rfc3339(date) || parse_heavy(date)
    end
  end
end