method

change

v7.1.3.2 - Show latest stable - 0 notes - Class: ActiveSupport::TimeWithZone

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What's this?

change(options) public

Returns a new +ActiveSupport::TimeWithZone+ 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, :zone. Pass either :usec or :nsec, not both. Similarly, pass either :zone or :offset, not both.

t = Time.zone.now          # => Fri, 14 Apr 2017 11:45:15.116992711 EST -05:00
t.change(year: 2020)       # => Tue, 14 Apr 2020 11:45:15.116992711 EST -05:00
t.change(hour: 12)         # => Fri, 14 Apr 2017 12:00:00.116992711 EST -05:00
t.change(min: 30)          # => Fri, 14 Apr 2017 11:30:00.116992711 EST -05:00
t.change(offset: "-10:00") # => Fri, 14 Apr 2017 11:45:15.116992711 HST -10:00
t.change(zone: "Hawaii")   # => Fri, 14 Apr 2017 11:45:15.116992711 HST -10:00

Show source

# File activesupport/lib/active_support/time_with_zone.rb, line 382
    def change(options)
      if options[:zone] && options[:offset]
        raise ArgumentError, "Can't change both :offset and :zone at the same time: #{options.inspect}"
      end

      new_time = time.change(options)

      if options[:zone]
        new_zone = ::Time.find_zone(options[:zone])
      elsif options[:offset]
        new_zone = ::Time.find_zone(new_time.utc_offset)
      end

      new_zone ||= time_zone
      periods = new_zone.periods_for_local(new_time)

      self.class.new(nil, new_zone, new_time, periods.include?(period) ? period : nil)
    end

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