Added snippet that confirms #1245

1245.rb

@@ -0,0 +1,52 @@
+#!/usr/bin/env ruby
+
+require 'rubygems'
+require 'dm-core'
+require 'dm-migrations'
+require 'dm-timestamps'
+
+DataMapper::Logger.new($stdout, :debug)
+DataMapper.setup(:default, 'sqlite3::memory:')
+
+class Person
+  include DataMapper::Resource
+  property :id,   Serial
+  property :name, String
+  timestamps :at
+end
+
+class Robot
+  include DataMapper::Resource
+  property :id,   Serial
+  property :name, String
+  timestamps :on
+end
+
+DataMapper.auto_migrate!
+
+p = Person.create(:name => 'fry', :created_at => DateTime.now-1, :updated_at => DateTime.now-1)
+puts p.created_at.to_s # set to yesterday
+puts p.updated_at.to_s # not set to yesterday
+
+t = Robot.create(:name => 'bender', :created_on => Date.today-1, :updated_on => Date.today-1)
+puts t.created_on.to_s # set to yesterday
+puts t.updated_on.to_s # not set to yesterday
+
+__END__
+
+ree-1.8.7-2010.01 mungo:dm-snippets snusnu$ bundle exec ruby 1245.rb 
+ ~ (0.000037) SELECT sqlite_version(*)
+ ~ (0.000068) DROP TABLE IF EXISTS "people"
+ ~ (0.000010) PRAGMA table_info("people")
+ ~ (0.000262) CREATE TABLE "people" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "name" VARCHAR(50), "created_at" TIMESTAMP NOT NULL, "updated_at" TIMESTAMP NOT NULL)
+ ~ (0.000018) DROP TABLE IF EXISTS "robots"
+ ~ (0.000007) PRAGMA table_info("robots")
+ ~ (0.000124) CREATE TABLE "robots" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "name" VARCHAR(50), "created_on" DATE NOT NULL, "updated_on" DATE NOT NULL)
+ ~ (0.000054) INSERT INTO "people" ("name", "created_at", "updated_at") VALUES ('fry', '2010-04-17T18:24:09+02:00', '2010-04-18T18:24:09+02:00')
+2010-04-17T18:24:09+02:00
+2010-04-18T18:24:09+02:00
+ ~ (0.000048) INSERT INTO "robots" ("name", "created_on", "updated_on") VALUES ('bender', '2010-04-17', '2010-04-18')
+2010-04-17
+2010-04-18
+
+