method

change

v5.2.3 - Show latest stable - Class: Time

change(options)

public

Returns a new Time where one or more of the elements have been changed according to the options parameter. The time options (:hour, :min, :sec, :usec, :nsec) reset cascadingly, so if only the hour is passed, then minute, sec, usec and nsec is set to 0. If the hour and minute is passed, then sec, usec and nsec is set to 0. The options parameter takes a hash with any of these keys: :year, :month, :day, :hour, :min, :sec, :usec, :nsec, :offset. Pass either :usec or :nsec, not both.

Time.new(2012, 8, 29, 22, 35, 0).change(day: 1)              # => Time.new(2012, 8, 1, 22, 35, 0)
Time.new(2012, 8, 29, 22, 35, 0).change(year: 1981, day: 1)  # => Time.new(1981, 8, 1, 22, 35, 0)
Time.new(2012, 8, 29, 22, 35, 0).change(year: 1981, hour: 0) # => Time.new(1981, 8, 29, 0, 0, 0)

# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 120
  def change(options)
    new_year   = options.fetch(:year, year)
    new_month  = options.fetch(:month, month)
    new_day    = options.fetch(:day, day)
    new_hour   = options.fetch(:hour, hour)
    new_min    = options.fetch(:min, options[:hour] ? 0 : min)
    new_sec    = options.fetch(:sec, (options[:hour] || options[:min]) ? 0 : sec)
    new_offset = options.fetch(:offset, nil)

    if new_nsec = options[:nsec]
      raise ArgumentError, "Can't change both :nsec and :usec at the same time: #{options.inspect}" if options[:usec]
      new_usec = Rational(new_nsec, 1000)
    else
      new_usec = options.fetch(:usec, (options[:hour] || options[:min] || options[:sec]) ? 0 : Rational(nsec, 1000))
    end

    raise ArgumentError, "argument out of range" if new_usec >= 1000000

    new_sec += Rational(new_usec, 1000000)

    if new_offset
      ::Time.new(new_year, new_month, new_day, new_hour, new_min, new_sec, new_offset)
    elsif utc?
      ::Time.utc(new_year, new_month, new_day, new_hour, new_min, new_sec)
    elsif zone
      ::Time.local(new_year, new_month, new_day, new_hour, new_min, new_sec)
    else
      ::Time.new(new_year, new_month, new_day, new_hour, new_min, new_sec, utc_offset)
    end
  end

change

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