TimeUtil distance methods should all return Fixnum

lib/ice_cube/time_util.rb

@@ -161,7 +161,7 @@ def self.days_in_next_month(time)
     # overflowing shorter months
     def self.days_to_next_month(time)
       date = Date.new(time.year, time.month, time.day)
-      (date >> 1) - date
+      ((date >> 1) - date).to_i
     end
 
     # Get a day of the month in the month of a given time without overflowing