datetime comparison

console.rb

001 > User.where('created_at >= ?', '2018-07-12T17:12:37.673+02:00')
  User Load (0.5ms)  SELECT  "users".* FROM "users" WHERE (created_at >= '2018-07-12T17:12:37.673+02:00') LIMIT ?  [["LIMIT", 11]]
 => #<ActiveRecord::Relation [#<User id: 1, username: "stuff", email: "[email protected]", password_hash: "4dc594e728edf9acd0148eb195e09af68a082ff6", password_salt: "9225fe40b42187ff1fc440b2c32cf2fba67e3be7", created_at: "2018-07-13 04:56:44", updated_at: "2018-07-13 04:56:44">]> 

002 > User.where('created_at <= ?', '2018-07-12T17:12:37.673+02:00')
  User Load (0.5ms)  SELECT  "users".* FROM "users" WHERE (created_at <= '2018-07-12T17:12:37.673+02:00') LIMIT ?  [["LIMIT", 11]]
 => #<ActiveRecord::Relation []> 

003 > user.created_at
 => Fri, 13 Jul 2018 04:56:44 UTC +00:00