advance

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 76
  def advance(options)
    unless options[:weeks].nil?
      options[:weeks], partial_weeks = options[:weeks].divmod(1)
      options[:days] = options.fetch(:days, 0) + 7 * partial_weeks
    end

    unless options[:days].nil?
      options[:days], partial_days = options[:days].divmod(1)
      options[:hours] = options.fetch(:hours, 0) + 24 * partial_days
    end

    d = to_date.advance(options)
    datetime_advanced_by_date = change(year: d.year, month: d.month, day: d.day)
    seconds_to_advance =        options.fetch(:seconds, 0) +
      options.fetch(:minutes, 0) * 60 +
      options.fetch(:hours, 0) * 3600

    if seconds_to_advance.zero?
      datetime_advanced_by_date
    else
      datetime_advanced_by_date.since(seconds_to_advance)
    end
  end