Rails3 で今日の「00:00:00」とか「23:59:59」とか取りたい時のメモ

(rails3.2.12)

irb(main):021:0> Date.today.midnight
=> Thu, 21 Mar 2013 00:00:00 JST +09:00
irb(main):022:0> Date.today.end_of_day
=> Thu, 21 Mar 2013 23:59:59 JST +09:00
irb(main):023:0> Time.now.midnight
=> 2013-03-21 00:00:00 +0900
irb(main):024:0> Time.now.end_of_day
=> 2013-03-21 23:59:59 +0900