What is the Rails way to define tomorrow's date?

Benchmarking these, I get:

N = 100000
Benchmark.bmbm do |test|
  test.report("Date.tomorrow") do
    N.times do
      x = Date.tomorrow
    end
  end
  test.report("Date.current.tomorrow") do
    N.times do
      x = Date.current.tomorrow
    end
  end
  # test.report("Date.now.tomorrow") # => Coughs up an exception, Date.now doesn't exist!
  test.report("DateTime.now.tomorrow.to_date") do
    N.times do 
      x = DateTime.now.tomorrow.to_date
    end    
  end
  test.report("Time.now.tomorrow.to_date") do
    N.times do
      x = Time.now.tomorrow.to_date
    end
  end
  test.report("Date.current+1") do
    N.times do
      x = Date.current+1
    end
  end
  test.report("DateTime.tomorrow") do
    N.times do 
      x = DateTime.now
    end    
  end
end

Results:

Rehearsal -----------------------------------------------------------------
Date.tomorrow                   1.640000   0.010000   1.650000 (  1.662668)
Date.current.tomorrow           1.580000   0.000000   1.580000 (  1.587714)
DateTime.now.tomorrow.to_date   0.360000   0.010000   0.370000 (  0.363281)
Time.now.tomorrow.to_date       4.270000   0.010000   4.280000 (  4.303273)
Date.current+1                  1.580000   0.010000   1.590000 (  1.590406)
DateTime.tomorrow               0.160000   0.000000   0.160000 (  0.164075)
-------------------------------------------------------- total: 9.630000sec

                                    user     system      total        real
Date.tomorrow                   1.590000   0.000000   1.590000 (  1.601091)
Date.current.tomorrow           1.610000   0.010000   1.620000 (  1.622415)
DateTime.now.tomorrow.to_date   0.310000   0.000000   0.310000 (  0.319628)
Time.now.tomorrow.to_date       4.120000   0.010000   4.130000 (  4.145556)
Date.current+1                  1.590000   0.000000   1.590000 (  1.596724)
DateTime.tomorrow               0.140000   0.000000   0.140000 (  0.137487)

From your list of suggestions, DateTime.now.tomorrow.to_date is faster.

Check out the last option I've added though, it returns a Date object and is the fastest of the bunch by a country mile. It's also one of the most human-readable from the list.

Assuming you're using MYSQL, your query might be faster if you use MySQL's BETWEEN() function:

@due_today = Event.where("due_date BETWEEN ? AND ?", DateTime.today, DateTime.tomorrow)

Although I'm not sure if you have indexes on events.due_date or if BETWEEN will still use these. You'll have to benchmark both to see which is quicker with a large DATA set.

Hope that helps?

How about this?

1.day.from_now
2.days.from_now
3.days.from_now

If you want to increment given time..

1.day.from_now(start_time) # gives a day after the start time