Rails Time

Earlier in the month I was experiencing some odd behaviour in ruby.

irb(main):002:0> DateTime.now
=> Mon, 13 Aug 2012 17:04:34 +0100
irb(main):003:0> DateTime.now + 2.days
=> Sat, 22 Sep 2485 17:04:42 +0100

DateTime is a class with a limit that goes up to year 9999 and as far as I can tell isn't stored as seconds, the more commonly used Time class is measured in seconds and goes up to 03:14:08 UTC on 19 January 2038 on 32 bit (thanks Wikipedia). All the Railsy time goodies (example, 5.weeks.from_now) are measured in seconds too, and so are only compatible with Time (or Date) class but not DateTime.

It is almost misleading that ActiveRecord says time is stored as DateTime in databases, it is actually stored as Time.


References
DateTime
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/DateTime.html

Date
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/Date.html

Time in Core
http://ruby-doc.org/core-1.9.3/Time.html
Time in Date. The difference is this has to_date, to_time, and to_datetime methods.
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/Time.html