Fix password_changed_at default date to 01-01-2015

db/migrate/20170914154743_fix_password_changed_at_default.rb

@@ -0,0 +1,10 @@
+class FixPasswordChangedAtDefault < ActiveRecord::Migration
+  def up
+    change_column_default :users, :password_changed_at, Time.new(2015, 1, 1,  1,  1,  1)
+  end
+
+  def down
+    change_column_default :users, :password_changed_at, Time.now
+  end
+
+end