class ActiveSupport::TimeZone

def formatted_offset(colon=true, alternate_utc_string = nil)

format "+HH:MM".
Returns the offset of this time zone as a formatted string, of the 
def formatted_offset(colon=true, alternate_utc_string = nil)
  utc_offset == 0 && alternate_utc_string || self.class.seconds_to_utc_offset(utc_offset, colon)
end