module ActiveSupport::Testing::TimeHelpers

Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
end
Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00
travel_to Time.zone.local(2004, 11, 24, 1, 4, 44) do
Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00

state at the end of the block:
This method also accepts a block, which will return the current time back to its original

leading to off-by-one-second errors).
errors with external services, like MySQL (which will round instead of floor,
Note that the usec for the time passed will be set to 0 to prevent rounding

please always use Time.current and Date.current.)
or Date.today, in order to honor the application time zone
be different. (Note that you rarely want to deal with Time.now,
Date.today the date according to Time.now, which may
Date.current returns a date equal to the argument, and
and Time.now its equivalent in the system time zone. Similarly,
application time zone. Time.current returns said timestamp,
Dates are taken as their timestamp at the beginning of the day in the

DateTime.current # => Wed, 24 Nov 2004 01:04:44 -0500
Date.current # => Wed, 24 Nov 2004
Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00
travel_to Time.zone.local(2004, 11, 24, 1, 4, 44)
Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00

The stubs are automatically removed at the end of the test.
+Date.today+, and +DateTime.now+ to return the time or date passed into this method.
Changes current time to the given time by stubbing +Time.now+,

def travel_to(date_or_time)
  if block_given? && in_block
    travel_to_nested_block_call = <<~MSG
Calling `travel_to` with a block, when we have previously already made a call to `travel_to`, can lead to confusing time stubbing.
Instead of:
   travel_to 2.days.from_now do
     # 2 days from today
     travel_to 3.days.from_now do
       # 5 days from today
     end
   end
preferred way to achieve above is:
   travel 2.days do
     # 2 days from today
   end
   travel 5.days do
     # 5 days from today
   end
    MSG
    raise travel_to_nested_block_call
  end
  if date_or_time.is_a?(Date) && !date_or_time.is_a?(DateTime)
    now = date_or_time.midnight.to_time
  elsif date_or_time.is_a?(String)
    now = Time.zone.parse(date_or_time)
  else
    now = date_or_time.to_time.change(usec: 0)
  end
  stubbed_time = Time.now if simple_stubs.stubbing(Time, :now)
  simple_stubs.stub_object(Time, :now) { at(now.to_i) }
  simple_stubs.stub_object(Date, :today) { jd(now.to_date.jd) }
  simple_stubs.stub_object(DateTime, :now) { jd(now.to_date.jd, now.hour, now.min, now.sec, Rational(now.utc_offset, 86400)) }
  if block_given?
    begin
      self.in_block = true
      yield
    ensure
      if stubbed_time
        travel_to stubbed_time
      else
        travel_back
      end
      self.in_block = false
    end
  end
end