def compile_formats
@sorted_token_keys = nil
self.time_format_set = FormatSet.compile(time_formats)
@us_date_format_set = FormatSet.compile(date_formats)
@us_datetime_format_set = FormatSet.compile(datetime_formats)
@euro_date_format_set = FormatSet.compile(date_formats.select { |format| US_FORMAT_REGEXP !~ format })
@euro_datetime_format_set = FormatSet.compile(datetime_formats.select { |format| US_FORMAT_REGEXP !~ format })
self.date_format_set = @us_date_format_set
self.datetime_format_set = @us_datetime_format_set
end