Ruby on rails events frequency

I'm using the JQuery full calendar in one of my rails applications,
however I've spotted (what I believe to be a bug) which is really
bugging me as I can't fix it.

Lets say my configured "END_TIME" is 31st December 2011 00:00:00 and I
create a daily event from 1st December 2011 16:20 - 17:20, to the
"END_TIME" the events are created from the 1st to the 29th. If I then
for example create a weekly event, occurring every 1 weeks from 1st
December 2011 16:20 - 17:20 to 31 to the "END_TIME" It stops on the 22nd
of December 2011 (1 week before its meant to)

It looks to me like the way events are created, its cutting short by 1x
the frequency but I'm unsure how to correctly fix this.

The code from the model is below.

##model##
def after_create
 create_events_until
end

def create_events_until
 st = starttime
 et = endtime
 p = r_period(period)
 nst, net = st, et

 while frequency.send(p).from_now(st) <= (END_TIME)
  self.events.create(:title => title, :description => description,
:all_day => all_day, :starttime => nst, :endtime => net, :user_id =>
user_id,
  :remind_at => remind_at, :remind_setting => remind_setting,
:remind_value => remind_value, :set_reminder => set_reminder,
:calendar_id => calendar_id, :resource_ids => resource_ids)
  nst = st = frequency.send(p).from_now(st)
  net = et = frequency.send(p).from_now(et)

  if period.downcase == 'monthly' or period.downcase == 'yearly'
    begin
      nst =
DateTime.parse("#{starttime.hour}:#{starttime.min}:#{starttime.sec},
#{starttime.day}-#{st.month}-#{st.year}")
      net =
DateTime.parse("#{endtime.hour}:#{endtime.min}:#{endtime.sec},
#{endtime.day}-#{et.month}-#{et.year}")
    rescue
      nst = net = nil
     end
    end
  end
end

def r_period(period)
 case period
   when 'Daily'
   p = 'days'
   when "Weekly"
   p = 'weeks'
   when "Monthly"
   p = 'months'
   when "Yearly"
   p = 'years'
 end
 return p
end
##end model##

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