Convert to/from DateTime and Time in Ruby

Question

How do you convert between a DateTime and a Time object in Ruby?

Answer 1

As an update to the state of the Ruby ecosystem, Date, DateTime and Time now have methods to convert between the various classes. Using Ruby 1.9.2+:

pry
[1] pry(main)> ts = 'Jan 1, 2000 12:01:01'
=> "Jan 1, 2000 12:01:01"
[2] pry(main)> require 'time'
=> true
[3] pry(main)> require 'date'
=> true
[4] pry(main)> ds = Date.parse(ts)
=> #
[5] pry(main)> ds.to_date
=> #
[6] pry(main)> ds.to_datetime
=> #
[7] pry(main)> ds.to_time
=> 2000-01-01 00:00:00 -0700
[8] pry(main)> ds.to_time.class
=> Time
[9] pry(main)> ds.to_datetime.class
=> DateTime
[10] pry(main)> ts = Time.parse(ts)
=> 2000-01-01 12:01:01 -0700
[11] pry(main)> ts.class
=> Time
[12] pry(main)> ts.to_date
=> #
[13] pry(main)> ts.to_date.class
=> Date
[14] pry(main)> ts.to_datetime
=> #
[15] pry(main)> ts.to_datetime.class
=> DateTime